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IDS Scale Basic Programming Manual

1. Scale Basic 4 2E Reference Sign r 207 r Purpose to set condition codes based on the value in register r Positive is set if the register is greater than 0 Negative is set if the register is less than 0 Zero is set if the register is zero Remarks Example Check for scale below zero Sign Gross set condition codes using the Gross weight register If Negative If Gross weight lt 0 End Exit End if End if Sub r a b 201 r a b Purpose subtract register b from register a put the result into register r Remarks sets condition codes Positive Negative and Zero to reflect results Example Sub Memoryl Memory2 Memory3 Memoryl Memory2 Memory3 Suspend Resume 249 250 Purpose Suspend stops a function from executing until a Resume is executed Remarks the Suspend instruction is executed in a scale basic function the Resume instruction is executed in an event monitor Example A filling operation stops waits 4 seconds then stores the gross weight in Memory Timer 1 is configured for 4 second time out and execute function Resume Timerl Time 40 Function Resume Fn 1 Relay off 1 turn off fill relay Timer on 1 turn on settle timer Suspend wait for scale to settle Timerl executes Resume Copy Memory1l Gross Memory Gross weight The above example could use motion detect to wait for scale stable condition Set pt 1 Upper register False Lower register Motion Execute function Resu
2. 3 turn on relay 3 End if End if End End of function Resume see Suspend instruction 250 Set r nnn 209 r nnn Purpose set a register to a value between 0 and 255 Remarks values greater than 255 are replaced by the modulo of 255 Example Set Memoryl 0 Set Tare 100 Set Id1 299 ERROR the maximum number is 255 Set pt off Set pt on nn 221 nn 220 nn Purpose to deactivate activate a setpoint monitor Remarks the active setpoint monitors are scanned by the event monitor the inactive setpoint monitors are not scanned When the setpoint condition is reached in an active setpoint monitor it activates a scale basic function and de activates itself The Set pt on instruction must be executed to reactivate a setpoint monitor Set pt off 0 turns off all setpoint monitors Example a filling operation uses relay output 1 to open a fill valve Setpoint monitor 1 monitors for overweight conditions Setpoint monitor 2 is set to activate function 2 when the net weight on the scale gt Memoryl Function key 1 activates function 1 which begins the fill operation Fnl Get data Memoryl Get the fill amount If not Clear key If Clear key NOT pressed Gosub Tare Tare the scale Relay on 1 Turn on fill valve Set pt on 1 Turn on over weight monitor Set pt on 2 Turn on setpoint monitor 2 End if End if End End of function Fn2 Relay off 1 Turn off relay1 Set pt off 0 Turn off all Setpoint monitors End End of function
3. Fn 2 Dec Memory10 current station ID current station ID 1 If positive If not end of scan Timer on 1 reset timer 1 Txcom1 Label32 transmit next station request Else Else Timer off 1 turn off timer 1 Txcom1 Label32 deselect all stations by selecting station 0 End if End if End End of function Fn 14 Make id Memory10 Make a new ID with station ID as the ID number Goto User2 Goto user function 2 End End of function NOTE On the slave stations only parameter 27 station ID needs to be configured All other functions in the slave operate automatically and in the background X0 X1 X2 Purpose to turn off continuous transmit transmit TX2 data 1 time or turn on continuous transmit of TX2 data Remarks EZ Link I O Ports TX Format Parameter 28 selects a data format that can be sent out communications port 2 Parameter 27 0 or serial input command X0 turns off continuous transmit of TX2 data Parameter 27 255 or serial input command X2 turns on continuous transmit of TX2 data Serial input command X1 transmits TX2 data 1 time Scale Basic 4 2E Reference Registers There are 5 types of registers memory registers fixed registers scale registers Id registers and special purpose registers Memory Registers Use memory registers for calculated setpoints and for operator entry setpoints There are 16 memory registers To access the registers enter the memory register number 1 to 16 and press the ENTER key The displ
4. back to ID memory to make the change permanent The ID registers are cleared after a Close id instruction Example Gosub Open id Open an existing id Set Id1 0 Set Id field 1 to zero Gosub Close id save change to ID record End Gross net 128 Purpose toggle between Gross display and Net display modes Remarks this is the default function for the Gross Net key Open id 140 Purpose get an ID number from the keyboard and then search memory for the ID record Remarks If the ID is not found then Err 21 is displayed until the operator presses a key The function that invoked Open id and all calling functions are automatically terminated unwinds subroutine stack Example Gosub Open id Open an existing id Set Id1 0 Set Id field 1 to zero Gosub Close id save change to ID record Open new 141 Purpose get an ID number from the keyboard and then search memory for the ID record Open the ID if it is found make a new ID if it is not found Peak clear 143 Purpose set the Peak weight register to 0 Remarks the Peak weight is obtained from raw unfiltered A D conversions and is stored in binary format The Peak Clear function is required to access the peak weight register Peak gross 156 Purpose to set the display to Peak Gross weight mode Peak net 157 Purpose to set the display to Peak Net weight mode Scale Basic 4 2E Reference Print1 Print2 Print3 Print4 133 134 135 146 Purpose to send formatted
5. lt sp gt lt sp gt lt sp gt lt sp gt 1945 lt cr gt RTxxx lt cr gt RQ lt status gt nnnn lt cr gt Purpose automatic transfer of register data from the recipient of RT command to the sender of the RT command Remarks network systems are normally setup in a master slave configuration The master units sends an RT command to the slave unit The slave unit returns an RQ reply RQ lt scale status gt lt contents of register xxx gt lt cr gt to the master unit The RQ command sets the Qflag true if scale weight is printable handbook 44 stores the nnnn data into register 15 and then executes Scale Basic function 15 Example transfer the Net weight from station 25 to the master unit In the Master unit configure the following Set print label 32 N lt M10 gt lt 13 gt RT66 lt 13 gt Note this uses Memory10 for station ID If Memory10 contains 25 then the following would be sent N25 lt cr gt RT66 lt 13 gt which translates into select station 25 Request Transmit of register 66 Net weight Fn 1 Set Memory10 25 Memory10 station ID 25 Txcom2 Label32 Transmit RT request to station 25 End End of function The receipt of an RQ reply from the slave unit causes the slave s Net weight to be stored in register Memory15 and function 15 is automatically invoked Fn 15 If Qstatus If received data is printable weight Copy Memoryl Memory15 Memory Unit25 s Net weight Else Else Set Memoryl 0 Memoryl 0 End if End if End
6. function for parameters 43 50 EZ Link Fixed Registers It is NOT good practice to change these registers using Scale Basic the changes will be lost on power up or when the configure function is invoked The next program prompts the operator for 2 numbers adds the numbers together and displays the sum It uses registers Memoryl and Memory to store the operator s input and Memory3 to store the sum Application Description Enter 2 numbers from the keyboard add them together display the sum Results Outputs Display the sum of 2 numbers Inputs n_n F1 key to begin program Operator data entry of 2 numbers Sequence of operation Press the F1 key to begin program Enter up to 6 digits then press the Enter key Enter up to 6 digits then press the Enter key Add inputs to obtain sum The sum is displayed The Inputs section lists the F1 key to start the program and the input of 2 numbers The input of the 2 numbers will be done in Scale Basic the F1 key is an event that can be configured Event Function Comments F1 key Userl begin summing program Use the sequence of operation to define User Function 1 The Fl key event triggers a function that requires entry of 2 numbers From the list of Scale Basic Instructions we find the Get Data r instruction is used to enter data The next step is to add the 2 numbers together The Add r a b instruction is used Finally the result is displayed The Display r instruction i
7. gt upper register Purpose2 to monitor a condition code and activate a scale basic function when the condition is true or false Set the upper register to True or False then the lower register to a condition code Remarks Setpoint monitors are activated using the Scale Basic instruction Setpoint On x There are 16 setpoint monitor records that contain the following data Upper register PO the upper value register setpoint triggers when lower gt upper Lower register P1 the lower value register Scale Basic Function P2 the scale basic function to execute when lower gt upper The next program uses 2 events F1 key to start things off and a setpoint monitor This program also uses a TTL output Relay 1 NOTE use test circuit shown at beginning of this section Application Description Drums are placed on the scale Tare the scale and then fill drums with material The fill amount is fixed at 500 lb Outputs Relay output 1 used to fill valve Inputs _AAAAA lt A lt A lt Fl key starts operation setpoint amount 500 lb Sequence of operation Operator presses F1 key Keyboard Event Tare the weight on the scale Turn on fill valve Monitor weight until Net gt setpoint amount Setpoint Event Turn off fill valve From the Inputs section above we can fill in the Events section of the design template The F1 key is used to start the fill process Use it to activate User function 1 The setpoint amo
8. you view Id memory as approx 490 records ID record 1 ID record 2 ID record 3 ID record 490 The condition code Zero is set true if the index number gt maximum or register r does not exist NOTE In EZ Link the fields in an ID record are accessed via Id1 Id2 Do not confuse the ID record with the Id field access symbols Example access ID record 3 set Id register 1 to 0 save the change to ID record 3 Scale Basic 4 2E Reference Set Memoryl 3 Memory 3 Index id Memoryl Open ID record 3 the 3d record in memory Set Id1 0 Set ID record 3 Id registerl to 0 Write id Write the most recently accessed ID to memory End End of function Keybd off Keybd on 227 226 Purpose to prohibit access to the keyboard when running a critical function The Clear key will turn the keyboard on if it has been turned off Remarks the Keyboard off instruction is used to prevent accidental operator interference during a critical function The Keyboard on instruction restores access to the keyboard functions The Clear key is a fail safe in case the keyboard is disabled and accidentally not re enabled Example setpoint is set to trip continuously upper register lower register and activate function 1 Function 1 turns off the keyboard and reactivates setpoint 1 This effectively disables the Clear key from re enabling the keyboard because the keyboard is turned off 60 times a second Keybd off disable the keyboa
9. 1 Get data Memory If not Clear key Timer on 5 Goto User2 End if End Relay on 1 Timer on 1 Copy Memory2 Memoryl End Dec Memory2 If Positive Timer on 1 Else Relay off 1 End if End set memory for 1 decimal position get ON time if NOT Clear key turn on timer 5 auto reload timer GOTO user function 2 end if End of function Turn on relay 1 Turn on timer 1 copy ON time to Memory2 End of function note timer 5 restarts itself subtract 1 from ON time interval If ON time gt 0 re activate timer 1 Else Turn off relay 1 End if End of function Scale Basic 4 2E Reference Fn 4 All off turn off all timers relays etc End End of function Txcom1 Txcom2 n 237 nnn 238 nnn Purpose to transmit a message from serial communications port 1 port 2 Remarks the Txcom instructions transmit formatted page output with n 1 2 3 or 4 for pages 1 2 3 4 The Txcom instructions transmit labels if n 32 33 34 84 85 86 87 where 32 print labels The print labels can be fixed messages or can be embedded with register data Embedded Code EZ Link Entry Keyboard Entry Comments any ASCII code lt nnn gt nnn nnn any number 0 255 register min size lt reg name gt 253 rr rr register number register 7 char field size reg name 254 rr 7 char field right justified NOTE1 The indicator waits for COM port 1 to complete its transmission i e nothing else is processed
10. 120 Stime Stored Time register The Stime register has the following uses Copy Stime lt register gt The copy instruction only works when copying from a decimal register to the Stime register The contents of lt register gt is copied to the Stime and Sdate registers Display Stime The Stime register is copied to the display Print the Stime register using the page formatter Item 13 prints the contents of the Stime register 121 Sdate Stored Date register The Sdate register has the following uses Display Sdate The Sdate register is copied to the display Print the Sdate register using the page formatter Item 14 prints the contents of the Sdate register Scale Basic 4 2E Reference Error Codes Err 0 Power on acquire zero error Occurs when parameter 20 is set to acquire zero on power up If the scale is out of zero range or in motion then Err 0 occurs Remove weight or wait for stable scale then press Clear key Err 1 Keyboard error Occurs when a key is pressed while power on test is in progress Err 2 Restart Trap The microprocessor accessed a non existent memory location Usual cause is electrical noise from the A C power supply Err 3 Watchdog Time out The weight display has not been updated within the watchdog time out period Usual cause is A C power glitch or static electric discharge Err 4 Battery Error Optional battery voltage level was below 2 V when the indicator was powered off Err 5 EAROM m
11. End of function NOTE On the slave station only parameter 27 station ID needs to be configured All other functions in the slave operate automatically and in the background RWxxx lt cr gt nnnn lt cr gt Purpose write nnnn data into register xXx Remarks xxx can be any valid register number Example the indicator receives RW5 lt cr gt 150 00 lt cr gt The result is that register Memory5 now contains 150 00 Scale Basic 4 2E Reference S I Purpose Status Idle pairs are used to verify that a remote station is available to accept commands Remarks network systems are normally setup in a master slave configuration The master units sends S command to the slave unit The slave replies with an P status if it is on line and available The Master receives the I as a command to execute user function 14 Example scan all network addresses for available stations 1 Memory10 is used as the current station ID register 2 Print label 32 N lt M10 gt lt 13 gt S lt 13 gt Select station Register 10 then send S command 3 Timerl is used to determine that a station is not responding If it times out it activates function 2 4 Function 2 decrements Memory10 and checks for end of scan 5 Fl activates function 1 which starts the station scan Timerl 2 2 Set for 0 2 sec time out activate function 2 Fn 1 Set Memory10 0 255 Set current station ID 255 Goto User2 Goto user function 2 End End of function
12. Id2 put keyboard tare into ID register 2 Write id Save ID data End if End if End End of function Mul r a b 202 r a b Purpose multiply register a by register b put results into register r Remarks sets condition codes Positive Negative and Zero to reflect results The decimal position of the result decimal position of register a decimal position of register b NOTE it is preferable to use a multiply in place of a divide see Div instruction example Example convert net weight pounds to tons Scale is calibrated x10 lb Set Memory 5 Dp adjust Memoryl 4 Memory 0 0005 Mul Memory2 Net Memoryl Memory2 Net 0 0005 Dp adjust Memory2 2 set result to 2 decimal positions Display Memory2 display tons End End of function Scale Basic 4 2E Reference Next1 see Loop1 Loop2 instruction 246 Next2 see Loop1 Loop2 instruction 248 Nop 254 Purpose no operation this instruction does nothing Remarks rarely used in scale basic Example Nop No operation do nothing Prompt nnn nnn nnn 232 nnn nnn 0 Purpose display a message on the numeric display Remarks this instruction is used to display status or to prompt the user for data input If the Get data instruction immediately follows the Prompt instruction then the prompt is used for data input NOTE user all capital letters Most cap s will display legibly lower case characters will not display legibly The following u
13. If COM port 1 is unable to transmit press the Clear key to exit NOTE2 COM port 2 transmits each message using interrupts the indicator continues operation while the message is sent in the background If a second message is sent COM port 2 waits up to 2 seconds for the first message to complete Message 2 aborts after waiting for 2 seconds Use Tx2ready status check before sending if all messages must be sent or if sending only if not busy Example all messages sent Loop1 If not Tx2ready Nextl End if Txcom2 Label90 Example send only if not busy If Tx2ready Txcom2 Lable32 End if Example use Print label 34 to transmit ASCII STX Net weight ASCI CR Print Net in 7 character field right justified Configure Print label 34 lt 02 gt Net lt 13 gt keyboard entry 02 66 13 0 Fl Txcoml 34 transmit print label 34 out serial communications port 1 End end of function Valid wt 219 Purpose wait for valid printable hb44 weight Reads scale and updates display Scale Basic 4 2E Reference Remarks this instruction takes a minimum of 3 A D conversion cycles Press the Clear key to abort Valid wt command also aborts the scale basic function using this instruction and all calling functions unwinds subroutine stack Example Valid wt wait for valid weight Abort all if Clear key pressed Gosub Printl print format 1 Write id 228 Purpose write ID data back to ID memory Remarks ID data is read in
14. Scale Basic Reference and Tutorial Version 4 2E Date 9 6 2001 Scale Basic 4 2E Table of Contents Table of Contents UN cia 1 SE AAA Pe O 2 EZ Link Installation bad 2 EZ Link ConfigUratiON 0ouciina ida ido 3 EZ IN Testi tooo decida 4 Event Driven PrograMMiNg lt oioooomcccsmesnicsmesiceenae sirenas master sines 6 Program Desi tinta A A ae ese Sea tence 6 Event Driven Programmiing ccccccccceceecceceeeeeceeereecceeeeseateeeseeaceeeeuaaeseseeaceaeeneadeeeseeadeaeeseaaeeenete 8 Scale Basic TutoMal cisco adan aduo drn adan dd deta carves cee 10 Getting tata A A A 10 Arithmetic and Registersy ccsnia lila 11 Setpoint MONTOS ica A A AAA Ida 14 EE EEE ce tances oh sett aa A eats aaa th camel eas Ae cata Sad tras eates OT 16 Timer If Else End if FlaQS ina aaa aeaa ea aaaea Da ae aa Ea aaa ei na aaa ban 17 Tutorial CONCIUSION ici A nan carte nes ae it nee AAA a 18 A cava viceeatectensacsdvecectcesdeocazert 19 Instruction Reference a a r a a a a a a a e a a a a 19 EONdItION Codes E E I A E A E 34 Built In FUNCIONS nna A An AE 37 Events n A a ees ce eae 40 Keyboard Events riot italia iaa ais 40 Setpolnt MONIO S a a t aaa la ae a a dt it aaa a ea a aaa aa ae eaa Eaa 40 Timer Events cercada e Ned a eaa ae late Pataca wade bahar do EL ea eaa aaea aiae Aa RR 42 TITE Input Events o dd aea ts aaa aa Aa AA aida 43 Serial Communications Port 1 IMPUt ooooononocccncnnccinonononcncnnnnnonnnononcnnnnnnnnnnnn non cnnnnnnnnnnnnnn
15. ate alt before using the alternate weight registers User1 User15 1 15 Purpose provide user programmable functions Zero 130 Purpose to zero the weight on the scale Remarks condition code Positive is true if successful The gross weight must be within the configured zero range and the scale must be stable for this function to succeed This is the default function for the Zero key Events Keyboard Events Purpose to execute a Scale Basic function when a key is pressed A key press event occurs when a function key PRINT UNITS GROSS NET TARE Fl F2 is pressed Setpoint Monitors Purpose 1 to monitor 2 registers and activate a scale basic function when the lower register is greater than or equal to the upper register trigger when lower register gt upper register Purpose 2 to monitor a condition code and activate a scale basic function when the condition is true or false Set the upper register to True or False then the lower register to a condition code Remarks Setpoint monitors are activated using the Scale Basic instruction Setpoint On x There are 16 setpoint monitor records that contain the following data Upper register PO the upper value register setpoint triggers when lower gt upper Lower register P1 the lower value register Scale Basic Function P2 the scale basic function to execute when lower gt upper Use the EZ Link button Setpoint Events or the indicator configuration function 71
16. ay prompts rEg xx for 1 second and then displays the contents of the register Press the CLEAR key to exit or enter a new value and press the ENTER key The following registers have special purpose uses Memory register 10 used for indirect relay control The number in register 10 can be used to turn on off a relay example Set Memory10 7 Set memory register 10 7 Relay on 10 Turn on Relay in register 10 Turn on relay 7 Memory register 15 used for networking serial input RQ command When communications port 2 receives an RQ command the data received is automatically put into register 15 Reg Number Register Name Memory Register 1 Memory Register 2 Memory Register 16 Fixed Registers Use the fixed registers for values that will not be changed The fixed registers are entered using configuration parameters 43 50 They are stored in EA ROM Reg Number Fixed Register 1 Fixed Register 8 Scale Registers The scale registers are the gross tare and net weights on the scale and the alternate units registers The alternate units are not calculated until needed If the Alt units registers are used in scale basic use the Update alt instruction to calculate the current value of the alternate weights Reg Number Register Name Scale Basic 4 2E ID Registers Alt units Gross weight Alt units Tare weight Alt units Net weight Gross Weight Tare Weight 66 NetWeight Reference Each ID record in me
17. cale Basic 4 2E Tutorial EZ Link Test Use this procedure to test the connection between the indicator and the PC On the PC If you are using Windows 95 access the Hyperterm program from the Start menu Programs Accessories Hyper Terminal In Windows 3 1 use the Terminal program Configure the Hyperterm program using the parameters entered above for the indicator On the indicator Hold the CLEAR key down and press the ENTER key to enter the configure mode Enter CFG 69 The indicator prompts diA xx where xx is the currently selected test number Test 4 Enter test number 4 and then press the ENTER key This test displays serial data as it is received by the indictor s serial communications port 2 The numeric display has limited alpha display capability however numeric and some upper case alpha characters are legible Type numeric data on the PC s keyboard If there is no change on the indicator s display 1 Is the Hyperterm program configured for the correct PC Com Port the one your communications cable is plugged into Check the Com port number used in Hyperterm and confirm that it is the same port that the cable is plugged into at the back of your computer 2 Is the indicator receiving the data Use a volt meter between pins 3 and 5 on the indicators port 2 terminal The volt meter should indicate a negative voltage approximately 5V to 12V Type data on the PC keyboard The volt meter should deviate when
18. d Scale Basic 4 2E Tutorial Event Driven Programming Event Driven programming is useful for real time applications Real time applications are those which depend on real events that happen when they happen For example a start switch closure setpoint trip level process monitoring are real events that the computer monitors but the timing of the events are not controlled by the computer The most widely available programming model is the sequential programming method Sequential programs work best in applications where actions take place in a step by step manner The next step in the process follows from the previous step In sequential programs for real time systems the program structure starts with a main loop which scans for selected events An event then activates a subroutine The subroutine will execute while scanning for events that may occur while the subroutine is active Ifan event occurs in a subroutine then another subroutine is activated and whatever events that need scanning are scanned In an Event Driven Programming environment events are automatically scanned for by the operating system When an event is detected it triggers a program function For example part of the indicator s event loop is to scan the keyboard Each key is assigned a Scale Basic function to execute when the event scanner detects a key press Each Scale Basic function is short and executes quickly Thus the structure of an event driven p
19. data is typed If not then the cable is wired incorrectly 3 Is the RS232 RS485 jumper in the correct position for port 2 Serial Port 2 IDS 440 JP3 IDS 420 070 O lO O RS232 input 2 Jumpers 1DS430 410 JP3 If all data being received is unintelligible Are the configuration parameters for PC Terminal program the same as the parameters for the indicator baud rate data bits and parity Scale Basic 4 2E Tutorial Test 5 Press the indicator s CLEAR key to exit diagnostic test 4 Enter test number 6 and then press the ENTER key This test transmits data out of the indicator s serial communications port 2 The display prompts OUT 0 Press the indicator s ENTER key to send data Serial Port 2 transmits 1234567890ABCDEF and prompts OUT 1 to indicate that 1 transmission has occurred The transmitted data should appear on the PC terminal screen If data does not appear Is the indicator sending the data Use a volt meter between pins 2 and 5 on the indicators terminal port 2 The volt meter should indicate a negative voltage approximately 5V to 12V Press the ENTER key on the indicator while diagnostic 4 is active The volt meter should deviate when data is transmitted If not the indicator s RS232 transmitter is defective Try changing the transmitter IC U1 Is the PC receiving the data Check the cable wiring Scale Basic 4 2E Tutorial Event Driven Programming This section provides an in
20. data to the printer Remarks there are 4 pages of print formats that can be configured Page 1 defaults to print the Gross weight when the display is in Gross mode Page 2 defaults to print Gross Tare and Net weights when the display is in the Net mode Printl prints pagel Print2 prints page 2 etc Print mode 136 Purpose to send formatted print pages to the printer Send page 1 if the display is in gross mode send page 2 if the display is in net mode Remarks this is the default function for the Print key Pulse clear 149 Purpose set the pulse count register to 0 Remarks pulses received on TTL input 6 are counted using the Count register 57 The register can be cleared using the Set Pulse 0 instruction if no counts are being received instruction is executed The Pulse clear function is used to guarantee that the register is set to 0 even if pulses are being received Read first 147 Purpose read the first ID record in memory Condition code Positive is true if successful Remarks Open new and Make ID open new ID s using an ID number key to arrange the ID records in numerical order Read first reads the ID record with the lowest ID number key Read next 148 Purpose read the next ID record in memory Condition code Positive is true if successful Remarks the Read first Read next functions are used to scan ID memory from lowest ID to highest ID Begin scanning using Read first then Read next while Positive status i
21. e between the indicator Port 2 and the PC Use the following diagram for signal connections NOTE There are 2 types of PC communications port connectors 25pin female left hand diagram and 9pin female right hand diagram Cable diagram PC to indicator PC Com Port PC Com Port 25 pin female 9 pin female Scale Basic 4 2E Tutorial EZ Link Configuration The indicator s communications port 2 Com Port 2 defaults to 9600 baud 8 bits no parity The EZ Link program defaults to the same values Ifthe defaults have not been changed then configuration is not required Check the indicator s Com Port 2 parameters Parameter 25 Serial Port 2 Mode Mode Number Mode Description 7 data bits no parity 7 data bits even parity 6 8 data bits odd parity Parameter 26 Serial Port 2 Baud Rate Baud Number Baud Description 9600 Baud 4800 Baud P50 Baud Configure the EZ Link communication parameters to the same values as the indicator s communication parameters 1 Double click on the EZ Link Icon located in the EZ Link directory to start the EZ Link program 2 In the Utilities menu select Setup PC Com Port Parameters The PC Com Port Setup menu is activated 3 Select the port number that the communications cable is attached to 4 Select the same baud rate parity data bits and stop bits that are set into the indicator 5 Enter the setup parameters below Com Port Baud Rate Data Bits Parity S
22. e when time out occurs Timers 1 4 must be reactivated with a Timer on instruction to begin again Timer 5 is an auto reload timer Example As often happens when developing an application the customer or the programmer notices that something has been left out In the case of the Setpoint Monitors application above the customer wants an automatic printout of the Gross Tare and Net weights of the batch If the print instruction is placed after the Relay off instruction in User function 2 the printout will be inaccurate The scale will be in motion What we need is a time out to allow the scale to settle Configure Timer 1 by clicking the Timer Events button in EZ Link Timer 1 Time 50 Resume set timer 1 5 0 seconds execute Resume function The timer activates the Resume function after a 5 second time out Modify User 2 function as follows User 2 Relay off 1 Turn off fill valve Timer on 1 Turn on timer 1 Suspend Wait until Resume from timer 1 Gosub Print2 Print page format 2 End End of function The new User 2 function uses the Suspend instruction in combination with Timer1 s Resume function The purpose of the Suspend Resume combination is to provide a suspension of a scale basic function until an event occurs In this case User function 2 turns off relay 2 turns on timer 1 and then suspends processing until timer 1 times out and executes the Resume function Timer5 If Else End if Flags Timer5 automatically reloads af
23. eight from the keyboard First change the setpoint Relay on 1 Set pt on 1 Display Net End monitor Event Function Fl key User 1 Setpoint 1 User 2 Comments Start Fill operation trigger when Net gt Memory1 setpoint amount Configure the Setpoint 1 event with the Upper register Memoryl and the Lower register Net weight register This will cause the setpoint to trigger when the Net weight gt the value in Memory 1 Configure the Setpoint 1 function to execute User 2 Next modify function User 1 Function Instructions Comments User 1 Get data Memoryl Copy Tare Gross Relay on 1 Set pt on 1 Display Net End Timers Get target weight Tare the scale Turn on fill valve Turn on setpoint monitor 1 Display net weight End of function Purpose 1 to trigger a scale basic function after a set time interval Purpose 2 to wait an interval of time inside a scale basic function Remarks Timer event monitors are activated using the Scale Basic instruction Timer on t When a timer is activated the time interval is set into the timers countdown register The countdown register decrements by every 0 1 seconds When the countdown reaches 0 the Scale Basic 4 2E Tutorial Scale Basic function is executed There are 5 timer records that contain the following data Time interval time interval in tenths of a second x0 1sec Max 6553 0 seconds Scale Basic Function the scale basic function to execut
24. emarks sets condition codes Positive Negative and Zero to reflect results The decimal position of the result before the divide determines the decimal position of the result after the divide Divide by 0 sets the result to 0 NOTE it is preferable to do a multiply instead of a divide see Mul example Example convert net weight pounds to tons Register Fixed43 is set to 2000 Dp adjust Memoryl 2 Set memory decimal position 0 00 Div Memory Net Fixed43 Memory Net Fixed43 Dp adjust r 212 r Purpose set the decimal position of a register Remarks if the new decimal position is less than the previous decimal position the result is rounded up by adding 5 to the most significant digit being dropped Do not use a decimal position greater than 9 Example Memory contains 0 425 Dp adjust Memoryl 2 Set memory decimal position to 2 0 00 The result 0 425 0 005 10 0 43 Else see if instruction 251 End if see If instruction 240 End 255 Purpose to end a function Remarks every function should have an End statement Example Relay off 1 Turn off relay 1 End End of function Erase id r 236 r Purpose erase an Id in memory Use the Id number in the register to find the Id and erase it Remarks condition code Positive is set true if the Id is found condition code Zero is set true if the Id is not found Example Get an Id number from the keyboard then erase the ID from memory Prompt ID Prom
25. emory error A checksum error has occurred when reading the configuration EAROM memory Check calibration parameters and rewrite the EAROM memory If error continues replace EAROM U15 Err 5 1 EAROM Time out unable to write to EAROM memory Err 6 Ram memory error Replace U22 if error continues Err 7 The A D converter is locked up Check the load cell wiring Err 8 Negative Deadload error Err 9 Count by error The entered value is not consistent with the configured count by Err 11 A D converter is not converting Err 12 Negative dead load Check loadcell wiring Err 13 Printer busy error The busy signal TB4 pin 14 is active TTL high Err 14 Page Format line length error A print line exceeded the maximum line length 135 char Err 15 The function selected is locked Switch 2 on the mother board unlocks the parameters Err 16 Scale Basic Stack Overflow Too many nested subroutine calls Err 18 Scale Basic Error A scale basic function attempted to execute an instruction that does not exits or a Goto Gosub instruction referenced a non existent function Err 20 Double weigh in A weight in was attempted on an ID that has been weighed in but not weighed out Err 21 ID not found Err 22 Scale Basic Prompt error The message length is greater than the display maximum Err 23 ID memory full Error OL Calibration error or scale is over loaded undEr Calibration error or scale is under loaded below readable weight Scale Bas
26. er than ENTER use the prompt instruction Dp adjust Memoryl 2 Set the decimal position of Memory register 1 Prompt PERCEN display PErcEn Get data Memoryl get the percentage An alternative method to prompt for data uses a time delay to display the prompt then the Get data instruction uses it s default ENTER prompt Assume Timer 1 is configured for 1 second delay Dp adjust Memoryl 2 Set the decimal position of Memory register 1 Prompt PERCEN display PErcEn on the display Timer on 1 turn on timer 1 1 seconds delay Loop1 While timer 1 on If Timerl lt keep looping gt Nextl End if End while Get data Memory get setpoint Prompt is replaced by EntEr End End of function Get key 230 Purpose stop processing until the operator presses a key Remarks this instruction is usually used when displaying a message that requires operator acknowledgment before proceeding Example Prompt START display StArt Get key wait for any key press Getid r 234 r Purpose use the number in register r to open an Id in memory Remarks Condition code Positive is set true if the Id is found condition code Zero is set true if the Id is not found Example Set Memory 25 Scale Basic 4 2E Reference Get id Memoryl Open Id 25 If Zero If the Id was not found Error msg 8 display error message 8 End if End if End End of function Gosub function no 243 nnn Purpose to execute a function subr
27. es user function 2 Flag off 1 Turn off general purpose flag 1 Set Memory2 60 memory2 60 Div Memory3 Memory1 Memory2 memory3 time 60 Display Memory3 Display Memory3 End End of function Setpoint monitor trips every scan cycle 60 times a second and activates function3 Inc Memoryl Memoryl Memoryl 1 If Flag If general flag 1 is on Set pt on re activate setpoint monitor 1 End if End if End End of function Get data r 231 r Purpose get data from the keyboard and put it into a register Remarks if the instruction immediately preceding the Get data instruction was the Prompt instruction the prompt is used for prompting otherwise ENTER is used for prompting Scale Basic 4 2E Reference The prompt is displayed for 0 7 seconds then if the register is non zero the register data is displayed If the register data is zero then the prompt is displayed until the operator enters data Condition codes Positive Negative and Zero are set to reflect data input Press the Clear key to abort data entry and leave the register unchanged NOTE use the Dp adjust instruction for data entry with decimal points Example get the percent of moisture The Get data instruction automatically prompts EntEr Set Memoryl 0 Memory1 0 The EntEr prompt remains until data entry Dp adjust Memoryl 2 Set the decimal position of Memory register 1 Get data Memory Get the kg liter into Memory1 To use a prompt oth
28. essages Function Instructions Comments Fl Instruction Operand1 Operand2 Operand3 Comment Prompt HELLO Display HELLO End End of function Scale Basic 4 2E Tutorial Use the template above to enter and test the program The program can be extracted from the Event and Function sections of the template If you are using keyboard entry enter the data listed in parenthesis 1 Invoke the EZ Link program 2 From the Event section Set Keyboard Events F1 key Userl parameter 57 1 3 From the Function section Scale Basic User 1 enter the following program parameter 72 Fn 1 232 72 69 76 76 79 255 Instruction _ Operand1 Operand2 Operand3 Comment Prompt HELLO Display HELLO End End of function 4 In EZ Link select File Save As then type in test1 then click OK This saves the program onto disk 5 In EZ Link select the UP Upload button Click on file testl sf then click on OK If the upload function is not working make sure that the indicator is in idle mode not in configure mode Try pressing the CLEAR key several times then try again If it still doesn t work then do the EZ Link test procedure described in this manual 6 Press the Fl key on the indicator HELLO should appear on the display 7 Press the Enter key several times Notice how the HELLO message remains on the display Press the Clear key The Gross weight should appear on the display The above program prese
29. event is detected the operating system activates a scale basic function The Scale Basic Tutorial section is a tutorial on the Scale Basic language It is a step by step demonstration on how to implement programs in Scale Basic The last section is a Reference on Scale basic This section describes the Scale Basic instructions built in functions condition codes and event types Scale Basic 4 2E Tutorial EZ Link EZ Link is a Microsoft Windows compatible program that you can use to configure program and test the indicator The Windows graphical user interface makes it easy to enter and view setup parameters and Scale Basic programs The setup data can be saved to disk and it can be written to and read from the indicator EZ Link Requirements e IBM PC compatible computer laptop e Windows 3 1 or Windows 95 e Approximately 1 6mb hard disk space e An available serial communications port on the PC e A cable to connect the PC to the indicator EZ Link Installation The EZ Link program is available in 3 1 2 inch floppy diskette It is compatible with Windows 3 1 Windows 95 1 Insert the EZ Link disk into diskette drive A 2 Start the installation program If you are using Windows 3 1 select Run from the Program Manager File Menu Type AASETUP and then click OK If you are using Windows 95 select Start then Run from the Taskbar Type AASETUP and then click OK 3 Follow the instructions on the screen Connect a cabl
30. flag 1 Display Net set to display Net weight Else Else lt current mode not display net gt Scale Basic 4 2E Reference Flag on 1 turn on flag 1 Display Memoryl set to display Memory total End if End if End End of function If not condition Else End if 242 nnn 251 240 Purpose to control program flow using a condition code Remarks sometimes it is more meaningful or more convenient to test for a false condition rather than a true condition In these situations use the If not instruction Example If not Centerz If the scale is not at center of zero Gosub Zero Zero the scale End if End if Inc r 204 r Purpose add 1 to a register Set condition codes Positive Negative and Zero to reflect results Remarks the decimal point is ignored If Memoryl 0 05 then Inc Memory1 0 06 This instruction is useful for counting the number of times something occurs Example Set Memory 25 For loop count 25 Loop1 Do lt Do loop stuff here gt Dec Memory loop count loop count 1 If Positive While loop count gt 0 Nextl Next loop End if End of For Next loop Index id r 217 r Purpose to access Id memory as an array of records The register r opens records by their location in memory Remarks the Get id Make id Write id Erase id instructions access Id memory with randomly assigned Id numbers the Id key The Index id instruction accesses an Id record by it s location in memory With this instruction
31. ic 4 2E Appendix A Design Template Appendix A Design Template Application Description This is a general description as given by the customer Outputs list the outputs that will be produced by this application Inputs list the inputs required by this application Sequence of operation describe the sequence of operation of this application Event Function Comments list the events used keyboard keys setpoint monitors timers communications ports Function Instructions Comments write the scale basic functions needed by this application Parameter Used for list resources used by this program include memory registers and configuration parameters Operators Manual Application Description Begin with design description Installation list parameters that are required to be setup list cable requirements TTL inputs TTL outputs Com ports Setup Parameters list parameters that the supervisor is required to setup Operators Functions describe how to use this application
32. ink only Fxxx lt cr gt Purpose execute scale basic function xxx Remarks this instruction provides remote control of any indicator function by way of scale basic functions Example the indicator receives F130 lt cr gt Function 130 is executed Zero the scale The indicator receives F2 lt cr gt User function 2 is executed Nxxx lt cr gt Purpose select station number xxx Remarks Port 2 can be assigned a station ID EZ Link I O Ports Station ID Configuration parameter 27 If the station ID is between 1 and 254 then port 2 powers up in network mode In network mode the port 2 transmitter is turned off and no commands are accepted until a station select is received Example Station ID is 125 The following commands are received N120 lt cr gt F2 lt cr gt The indicator does nothing because its station ID has not been selected N125 lt cr gt F5 lt cr gt N110 lt cr gt F10 lt cr gt The indicator is selected executes function 5 and is then deselected when it receives the N110 lt cr gt command RRxxx lt cr gt Purpose transmit contents of register xxx Scale Basic 4 2E Reference Remarks xxx can be any valid register number The data is transmitted in the form nnnnnnnnn lt cr gt where nnnnnnnnn is the contents of register xxx in a 9 character field zero blanked Example the net weight is 1945 lb The indicator receives R66 lt cr gt then it transmits the contents of the Net weight register in the form lt sp gt
33. isplay Memory3 Display sum End End of function 6 In EZ Link select File Save As then type in test2 then click OK This saves the program onto disk 7 In EZ Link select the UP Upload button Click on file test2 sf then click on OK 8 Press the F1 key on the indicator This program could be improved by changing the display to Gross mode after the operator presses a key The same Display instruction can be used to change the display from Memory3 to the Gross register However if the Display Gross instruction immediately follows the Display Memory 3 instruction the operator will not see the sum because it will be replaced by the Gross weight The Get key instruction can be used to pause the program until a key is pressed Function Instructions Comments Userl Get data Memory Memoryl Get operator input Get data Memory2 Memory2 Get operator input Add Memory3 Memoryl Memory2Memory3 Memoryl Memory2 Display Memory3 Display sum Get key Wait for key press Display Gross Display Gross weight End End of function Try changing the Add instruction to Sub Mul and Div Also try more complex math functions The math functions work on any register Try using other registers Gross Tare Net Fixed Scale Basic 4 2E Tutorial Setpoint Monitors Purposel to monitor 2 registers and activate a scale basic function when the lower register is greater than or equal to the upper register trigger when lower register
34. key If Clear key NOT pressed Gosub Tare Tare the scale Enter key 105 Purpose true if last key pressed was the Enter key Remarks the Enter key is used to complete data entry or to continue to the next operation Flag 1 9 51 59 Purpose true if FlagX is ON Remarks the flags are used to remember a state or condition Example Use the Fl key to toggle the display between Net display mode and Total Memory1 display mode Flag 1 is set ON to display Total Off to display Gross Fn 1 If Flagl if Flagl is on ON display total Display Gross set display mode to gross weight Else else Flag is off display gross Display Memoryl set display mode to total weight End if End if Scale Basic 4 2E Reference Flags 10 16 Purpose Enables control of status LEDs on display panel Gross Net Motion Zero Lb Kg Remarks Flag 10 is used to allow turning on and off the status LED displays flags 11 16 Example Use the Fl amp F2 keys to toggle on and off the all the displays Individual LEDs could be used to show an over under or between status high or low status as a bar graph or to emulate a masters display in a master slave network Set CFG 57 to 1 F1 key will execute user Fn 1 turn on all LEDs Set CFG 58 to 2 F2 key will execute user Fn 2 turn off all LEDs Fn 1 Flag on 10 Enable LED control flag 10 Flag on 11 Flag on 11 Gross LED on Flag on 12 Flag on 12 Net LED on Flag on 13 Flag on 13 Motion LED
35. me Fn 1 Relay off 1 turn off fill relay Set pt on 1 turn on motion detect monitor Suspend Setpoint monitor 1 executes Resume Copy Memory Gross Memory Gross weight Scale Basic 4 2E Timer off Timer on Purpose to activate de activate a timer n Reference 225 n 224 n Remarks the active timers are scanned by the event monitor When an active timer counts down to 0 times out it activates a scale basic function and de activates itself Timer off 0 turns off all timers NOTE timer 5 is a special timer It is an auto reload timer When it times out it automatically restarts itself and then executes a scale basic function The Timer off instruction must be executed to turn off timer 5 Example keyboard key F1 activates function 1 Function 1 starts a relay output cycle where relay 1 turns on in 5 second intervals Relay 1 turns off based on the number of tenths of seconds entered into Memory Timerl Time 1 time interval 0 1 seconds Function User3 execute function 3 turn off relay 1 Timer2 Time 20 time interval 2 0 seconds Function Resume execute Resume used for Prompt pause Timers5 Time 50 time interval 5 0 seconds Function User2 turn on relay1 turn on timer 1 Fn 1 All off Begin with all setpoints timers and relays off Prompt ONTIME prompt for on time data entry Timer On 2 turn on prompt pause timer Suspend suspend for 2 seconds Fn 2 Fn 3 Dp adjust Memoryl
36. meter 28 see operation parameters selects a format AND Condec etc for transmission via communications port 2 If configuration parameter 27 is set to 0 then the format selected by parameter 28 is continuously transmitted Do not use function Tx data if parameter 28 is set to 0 Units 127 Purpose toggle display mode between primary weight units and alternate weight units Remarks this is the default function for the Units key Update 137 Purpose update weight registers update display and scan for events Remarks Scale Basic functions should execute quickly and terminate to allow the event scanner to process all events that occur If you write a function that does not terminate quickly or depends on scale status to continue use the Update function if you need updated weight data or if a critical event might be pending Example a function waits for stable weight motion false before issuing a print command Scale Basic 4 2E Reference Loop1 While If Motion Motion on scale Update Update scale readings Nextl End End if While Motion Gosub Printl Print page 1 Update alt 145 Purpose update alternate weight units registers Remarks the indicator is designed provide weights in 2 units of measure primary and alternate units The all weight calculations are performed in the primary weight units The alternate unit weights are only calculated as needed If you use alternate units in Scale Basic functions the Gosub Upd
37. mory has 6 registers The register data for an ID is available when it is opened instructions Get id Make id functions Open id and Open new The register data is written to an ID record when it is closed instruction Write id and function Close id The Id Number register contains the ID of the currently open ID record This register is read only it should not be written to Other Registers 68 Id Register2 69 idRegister3 The Pulse register contains the number of pulses received on TTL input 6 The Rate register contains the number of pulses received on TTL input 6 in 1 second pulses second The True and False registers are used by the Setpoint Monitors to enable triggering on condition codes Ifa setpoints upper register is set to true and the lower register is set to Motion then the setpoint will trigger when the scale is in motion Scale Basic 4 2E Reference Time Date Logging Modification 118 Time Time Register The Time register has the following uses Copy lt register gt Time The copy instruction only works when copying from Time to a decimal register The current time and date is read from the clock and then copied in BCD format to the decimal register Display Time The current time is read from the clock and then copied to the display 119 Date Date Register The Date register has the following uses Display Date The current date is read from the clock and then copied to the display
38. n fill to the exact target weight neither over or under After consulting with the customer it is determined that the fill tolerance should be within 2 of the target weight MODIFIED DESIGN Application Description The operator places containers on the scale and fills them with resin An Under weight light turns on while the container weight is more than 2 below the target weight There are 3 sizes of container each is filled with a different amount of resin If the container is filled with too much resin more than 2 over target weight turn on an Overweight light until enough resin is removed for the container to be within specifications Sequence of operation Enter target weight data Use the indicator s built in memory register input function The operator sets memory registers 1 2 and 3 for container 1 2 and 3 Select a target weight Use the F1 key to initiate target weight selection The display prompts Con The operator enters the container number that will be filled The over weight setpoint and underweight setpoints are calculated by adding subtracting 2 from the target weight COMMENTS The changes to the design are shown above in bold lettering Notice how each step in the program design is a refinement of the previous step Also note that often missing specifications and other problems don t become apparent until well into the design process Many times the approach will have to be change
39. nnnn 43 Serial Communications Port 2 INPUt ooooonococccncnnccconononcncnnnnnonnnononcnnnnnnnnnnnn nn nnnnn nn nnnnnn nana 44 SO NO 47 Error Codes ns einh a Ar aai aae r E A A E a ad 50 Appendix A Design Template coooomonnnncccccccccononanannnnnncnnnnnnnnanannnnnennnnnnnnanannns 51 Scale Basic 4 2E Introduction Introduction Scale Basic in a programming language that is used to modify the functions of a weight indicator This makes it possible for the weight indicator to be customized to fit a wide variety of weighing applications The first section of this manual describes how to use EZ Link a computer program that runs on a PC computer under Microsoft s Windows operating system EZ Link connects the indicator to a PC computer It is used to configure the weight indicator s parameters and to enter Scale Basic functions using the Windows graphical interface Use the EZ Link section to learn how to connect the indicator to a PC computer and how to use EZ Link to configure program and test the weight indicator The Event Driven Programming section of the manual begins with a discussion of program design and then goes on to describe event driven programming Scale Basic functions are controlled by a computer operating system called an event driven executive This means that the operation of the indicator is controlled by a combination of events and functions The operating system scans for events When an
40. nts the programmer with a decision The program works but the user of the program may get stuck not knowing to press the Clear key Good programming practice assumes that the user will always do the wrong thing To fix the above program use the Get key command to wait for any key press then force the display to a known state Use the Display register instruction to display the gross weight after the Get key instruction Modify the function in step 3 above Instruction Operandl Operand2 Operand3 Comment Prompt HELLO Display HELLO Get key Wait for key press Display Gross Display gross weight End End of function Do steps 4 through 7 above Arithmetic and Registers There are 3 types of registers general purpose registers Memoryl 15 permanent storage registers Fixed43 50 and special purpose registers Gross Tare Net Id1 The general purpose registers Memory1 15 are used for temporary storage and for calculations The Memory registers are stored in RAM memory they can be read and written to If power is lost the data in the registers is lost Scale Basic instructions Add Sub Mul Div Copy Sign Compare Dp adjust Set and Get data can use the Memory registers Scale Basic 4 2E Tutorial The permanent storage registers Fixed43 50 are used for permanent storage of numbers These registers are stored in EA ROM memory they retain their value if power is lost They are set by using the configure
41. on Flag on 14 Flag on 14 Zero LED on Flag on 15 Flag on 15 Lb LED on Flag on 16 Flag on 16 Kg LED on Display Gross Display the gross weight Fn 2 All off Turns all flags to false and off NOTE The all off instruction turns off all flags setpoints amp timers one may use the flag off 10 thru 16 for individual control of each LED Input 1 6 61 66 Purpose true if TTL input is idle TTL high Remarks the TTL inputs are normally high They are often used to detect a switch closure which connects the TTL input to Ground TTL low The TTL inputs use negative logic Example If Input5 test for input 5 idle If not Input5 test for input 5 ON Ktare Wtare 112 113 Purpose true if the tare register data was entered from the keyboard Ktare or read from the scale Wtare Minus 102 Purpose true if previous calculation result was negative Motion 107 Purpose true if the scale is in motion Scale Basic 4 2E Reference Netmode 103 Purpose true if display is in Net mode Overload 115 Purpose true if scale status Overload Positive 101 Purpose true if previous calculation result was Positive Remarks Also set by Get id and Make id to signal that the instruction was successful Printable 108 Purpose true if the weight registers Gross Net contain printable handbook 44 weight Qstatus 110 Purpose true if communications port 2 receives an I status from a previous status reque
42. on to begin again Timer 5 is an auto reload timer Timer5 automatically reloads after it counts down to 0 This provides more accurate timing of repetitive events such as pulse outputs speed calculations interval timing etc Timer5 continues cycling until the Timer off 5 instruction is executed Example Purpose 1 trigger user function 7 after a 1 minute time out Configure timer 1 Time interval 600 1 minute 60 0 seconds Execute Function User7 execute user function 6 Example Purpose 2 display a message for 2 seconds then display Gross weight Configure timer 1 Time interval 20 set for 2 0 seconds Execute Function Userl execute user function 1 Fn 1 Prompt ERROR Display ERROR Timer on 1 turn on timer 1 Loop1 While If Timerl Timer is on Nextl Wait End if End While Display Gross Display Gross weight Example TimerS5 Pulse relay output 1 at 0 2 second intervals Configure F1 key to execute user function 10 Configure Timer5 to execute function 10 after a 0 2 second time out Time interval 2 set for 0 2 seconds Execute Function User10 execute user function 10 Fn10 If Flagl if Flag 1 is on Flag off 1 turn off flag 1 Relay off 1 turn off relay 1 Else Else Scale Basic 4 2E Reference Flag on 1 turn on flag 1 Relay on 1 turn on relay 1 End if End if This example will cause relay output 1 to continuously turn on and off in 0 2 second intervals TTL Input Events Purpose execute a scale basic function
43. outine from within a function and return to the calling function at the instruction after the Gosub instruction Remarks a subroutine can be called from within a subroutine this is called nesting The maximum level of nesting is 8 i e function gt function6 gt function7 gt function maximum 8 levels Example in a bulk weigh function the scale is zeroed the display is set to Net mode and relay is turned on Gosub Zero Zero the scale Gosub Set net Set the display to net mode Relay on 1 Turn on relay 1 End End of function Goto function no 244 nnn Purpose transfer execution from one function to another Remarks Example If Flag4 If flag4 is on Goto 7 Go to function 7 End if End if Set pt On 2 Turn on setpoint 2 This instruction is not executed if Goto was executed If condition Else End if 241 nnn 251 240 Purpose to control program flow using a condition code Remarks the instructions after the if statement are executed if the condition code is true the instructions after the Else statement are executed if the condition code is false The Else part of the instruction is optional The End if statement ends the If statement Example the F1 key activates function1 is used to toggle the display between net weight and memory total Flagl is used to determine the current state of the display Flag True display total If Flagl If current mode display total Flag off 1 turn off
44. ple copy Memoryl Gross Copy the gross weight into memory register 1 Example copy Memoryl Time Copy the time and date to memory register 1 Example copy Stime Memoryl Copy the stored time and date to stime register for printing For more on time and date storage see page 49 Dec r 205 r Purpose subtract 1 from a register Set condition codes Positive Negative and Zero to reflect results Remarks the decimal point is ignored If Memoryl 0 05 then Dec Memoryl 0 04 This instruction is useful in creating loops that must be executed a fixed number of times Example the following is an example of using the Dec instruction to implement a For Next loop Set Memoryl 25 For loop count 25 Loop1 Do lt Do loop stuff here gt Dec Memory loop count loop count 1 If Positive While loop count gt 0 Nextl Next loop End if End of For Next loop Display r 218 r Purpose to display the contents of a register The registers contents continue to be displayed until another Display command is issued or the Gross Net key on the keyboard is pressed Remarks If the Gross Net key is re programmed to some function other than the Gross net function then the Gross Net key will not clear the Display command Example Display Id1 Display ID register 1 normally used for totals Div r a b 203 r a b Purpose divide register a by register b put results into register r Scale Basic 4 2E Reference R
45. pper case characters will not display K M Q V W X Example prompt the user for target weight using the prompt SETPT Prompt SETPT display SEtPt on the display Get data Memoryl get setpoint data An alternative method to prompt for data uses a time delay to display the prompt then the Get data instruction uses it s default ENTER prompt Assume Timer is configured for 1 second delay Prompt SETPT display SEtPt on the display Timer on 1 turn on timer 1 1 seconds delay Loop1 While timer 1 on If Timerl lt keep looping gt Nextl End if End while Get data Memory get setpoint Prompt is replaced by EntEr End End of function Relay off Relay on relay no 223 n 222 n Purpose to turn off on relay outputs Remarks the TTL output signals are labeled Relay1 Relay2 The Relay off instruction sets the TTL output signal to TTL high the Relay on instruction sets the TTL output signal to TTL low When the TTL output is connected to a solid state relay the TTL low level turns ON the relay NOTE1 Relay off 0 turns off all relays NOTE2 Relay on off 10 gets relay number from register 10 For example Set Memory10 4 set memory10 4 Scale Basic 4 2E Reference Relay on 10 turn relay number contained in Memory10 on Example turn off all relays If scale is at center of zero turn on relay 3 Relay off 0 turn off all relays If Centerz If scale is at center of zero Relay on
46. pt the user to enter an Id number Get data Memoryl Get an Id number Put it into Memoryl Erase id Memoryl Find the Id record pointed to by Memoryl Erase it Error msg error no 239 nnn Purpose to display user definable error messages on the display in the form Err xxx where xxx is a number between 1 and 255 Scale Basic 4 2E Reference Remarks Use this instruction to alert the operator that an error condition has occurred The message is displayed until the operator presses any key Example register Fixed43 is set to the maximum weight allowed in a weigh hopper Compare Gross Fixed43 If Positive If Gross weight gt Maximum All off turn off all setpoint monitors relays and timers Error msg 9 display Err 9 End Exit function End if End if over weight error Flag on Flag off flag no 210 n Purpose to turn on off a general purpose flag NOTE Flag off 0 turn off all flags Remarks there are 9 general purpose flags that can be set on off using Flag on Flag off instructions The status of the flags can be tested using the Flag x condition code Flags are useful for communicating between functions Example Use the Fl key to start a timer use the F2 key to stop the timer and display the elapsed time in seconds The F1 key activates user function1 Flag on 1 Turn on general purpose flag 1 Set pt on 1 Turn on setpoint monitor 1 Set Memoryl 0 Memoryl 0 End End of function The F2 key activat
47. rces used by this program include memory registers and configuration parameters Scale Basic 4 2E Tutorial Scale Basic Tutorial The following section assumes that the indicator is connected to a PC computer using EZ Link If you are not connected then use the keyboard entry techniques described in the user s manual Some of the examples used in the tutorial use the TTL Outputs Relay outputs Use the following circuit to view the results of the Relay out commands Test Circuit for Relay output 1 Ee 5 470 ohm LED Getting Started Most instruction books on computer languages start off with the most simple of programs how to display HELLO WORLD on the computer screen Application Description Display HELLO on the indicators numeric display Results Outputs HELLO message displayed on numeric display Inputs es Fl key to initiate program Sequence of operation Press the F1 key The indicator displays HELLO Use the above design criteria to define the events than need to be configured The Inputs section of the design lists the F1 key as the event that starts the Hello program Event Function Comments Fl keyUser Function 1 The F1 key initiates the program by starting function1 Use the sequence of operation to define User Function 1 The F1 key event triggers a function that displays HELLO From the list of Scale Basic Instructions we find the Prompt instruction is used to display m
48. rd Set pt on 1 re arm setpoint monitor 1 End End of function Loop1 Next1 Loop2 Next2 245 246 247 248 Purpose the loop instruction is used to make Do Until Do While and For Next loops Remarks to have a loop within a loop use loop1 loop2 next2 nextl Example The following is an example of a Do Until loop Loop1 Do Gosub Update Update weight display and scan events If Motion Nextl Until Scale is NOT in motion End if End End of function The following is an example of a Do While Loop1 Do If Motion While scale is in motion Gosub Update Update weight display and scan events Nextl End if End Do While End End of Function The following is an example of a For Next loop Scale Basic 4 2E Reference Set Memoryl 20 Loop1 For Memoryl 20 down to 0 Index id Memoryl Set Id1 0 ID Memroy register 1 0 Dec Memoryl If Positive Nextl End if End For End End of function Make id r 235 r Purpose to open an ID record Ifthe ID number in register r in not found open a new ID record and assign ID r to it Remarks condition code Positive is set true if the Id is made or found condition code Zero is set true if the Id could not be made memory full Example Get an ID number from the keyboard open make the ID get tare from keyboard save the data Get data Memory1 Get an ID number from the keyboard If not Clear key If NOT Clear key Make id Memoryl Open Make ID Get data
49. resin An Under weight light turns on while the container weight is below the target weight There are 3 sizes of container each is filled with a different amount of resin If the container is filled with too much resin turn on an Overweight light until enough resin is removed for the container to be within specifications Results Outputs Container filled with the proper amount of resin 3 sizes of container An Under weight light An Over weight light Inputs _ ____ nooo Target weights 3 Target weight select Start operation Scale Basic 4 2E Tutorial Sequence of operation Enter target weight data Use the indicator s built in memory register input function The operator sets memory registers 1 2 and 3 for container 1 2 and 3 Select a target weight Use the F1 key to initiate target weight selection The display prompts Con The operator enters the container number that will be filled Monitor weight for over under use Power On Start to initiate underweight scan by activating user function1 Function 1 turns on Setpoint Monitor 1 and turns Under weight light relay 1 Setpoint triggers when the scale is no longer under weight It activates function 2 Function2 turns on Setpoint Monitor 2 overweight scan and turns on relay2 and turns off relay 1 Setpoint 2 triggers when the scale is no longer over weight It activates function 1 REVIEW It is unlikely that the operator ca
50. results Example Add Memoryl Memory2 Memory3 Memoryl Memory2 Memory3 Add Memory5 Memory5 Net Add Net weight to register 5 All off 229 Purpose turn off all setpoints relays and timers Remarks this instruction is usually used to turn off everything when an error occurs or to make sure everything is off at the end of a process Example All off Turn off all setpoints relays and timers Beep n 233 n Purpose Sound the beeper n times Compare a b 208 a b Purpose compare 2 registers The condition codes Positive Minus and Zero are set as a result of subtracting register a from register b therefore Positive True if register a gt register b Negative True if register a lt register b Zero True if register a register b Remarks the Compare instruction does not change the value of any registers it only changes the value of the Positive Negative and Zero condition codes Example register Fixed43 contains a setpoint Turn off relay 1 if Net gt Fixed43 Compare Net Fixed43 If Positive If Net gt Setpoint Fixed43 Relay off 1 turn off relay 1 End if End if Scale Basic 4 2E Reference Test for Net gt Fixed43 Compare Net Fixed43 If not Negative If Net gt Setpoint Fixed43 Relay off 1 turn off relay 1 End if End if Copy To From 206 to from Purpose copy the contents of register from to register to Remarks copy does not affect the condition codes Exam
51. rogram is event action event action event action In event driven program design the program structure is centered around event action pairs The event scanning is taken care of in the operating systems event scanner The tutorial that follows uses the techniques described above for program design and then completes the programs using techniques of program implementation Program Implementation Steps 1 Identify events and select the functions that they will activate Write program functions 2 3 Test program 4 Modify program as needed 5 Repeat steps 3 amp 4 as needed Scale Basic 4 2E Tutorial Design Template To help in the design process we will use the following design template The first 4 sections Application Description Outputs Inputs Sequence of operation are used in program design The remaining sections are used in program implementation Application Title Application Description This is a general description as given by the customer Outputs list the outputs that will be produced by this application Inputs list the inputs required by this application Sequence of operation describe the sequence of operation of this application Event Function Comments list the events used keyboard keys setpoint monitors timers communications ports Function Instructions Comments write the scale basic functions needed by this application Parameter Used for list resou
52. s true Example register Id1 is used for totals Page format 4 is setup to print ID totals Read first read the first ID in memory Loop1 While If Positive Read successful Gosub Print4 Print total Read next Read next ID in memory Next 1 End End if While End End of function Resume 250 Purpose used by Setpoints and Timers to resume processing a function that has been suspended Scale Basic 4 2E Reference Remarks the Suspend instruction stops a Scale Basic function from executing thus allowing the Event Monitor to scan for events The Resume function reactivates the function that suspended at the instruction following the Suspend instruction Example Timer is set for 4 second delay then it activates the Resume function Timer on 1 Turn on timer 1 Suspend Suspend until Resume executed Relay off 6 Turn off relay 6 Set gross 131 Purpose to set the display to the Gross mode Remarks this function is equivalent to the instruction Display Gross Set net 132 Purpose to set the display to Net mode Remarks this function is equivalent to the instruction Display Net Tare 129 Purpose put the gross weight into the tare register Change to Net display mode Remarks Condition code Positive is true if successful The scale must be stable no motion and above zero for the Tare function to succeed Tx data 144 Purpose transmit formatted data see parameter 28 out communications port 2 Remarks configuration para
53. s used NOTE the program listing that follows is formatted in a more compact form than the HELLO program above Instead of listing the instructions under Instruction Operand 1 Operand 2 and Operand 3 the instructions and operands are listed together separated by commas Function Instructions Comments Userl Get data Memory Memory1 Get operator input Get data Memroy2 Memory2 Get operator input Add Memory3 Memoryl Memory2 Memory3 Memoryl Memory2 Display Memory3 Display sum End End of function Scale Basic 4 2E Tutorial The above function uses Memory1 2 and 3 The memory registers used are listed in the Parameters section of the design template This section of the template is used to manage resources such as memory registers and to list parameters that need to be configured such as Fixed registers or print labels Parameter Used for Memory operator input 1 Memory2 operator input 2 Memory3 sum Use the template above to enter the program configure F1 key and User1 function Upload the program then press the F1 key to execute the program 1 Invoke the EZ Link program 2 Click on Reset to Defaults to clear previous example 3 Set Keyboard Events Fl key Userl 4 Scale Basic User 1 enter the following program Function Instructions Comments Userl Get data Memory Memory Get operator input Get data Memroy2 Memory2 Get operator input Add Memory3 Memoryl Memory2Memory3 Memory Memory2 D
54. st or if communications port 2 receives a V valid weight from a previously sent RQ message Remarks Qstatus is used when multiple indicators are connected together in a network The networks are normally setup in a Master Slave configuration The Master unit sends out status inquires S to the slave units The slave units send back an I if they are idle Qstatus is turned ON or a B if they are busy Qstatus is turned OFF The Master units sends out an RT request to automatically read a slave units data registers including Gross and Net registers The Qstatus flag is set if the slave units weight registers contain printable handbook44 weight Setpoint 1 15 1 15 Purpose true if SetpointX is active Timer 1 5 41 45 Purpose true if TimerX is active Tx2ready 114 Purpose true if Com port 2 transmit is ready not busy sending a previous message Zero 100 Purpose true if previous calculation result was Zero Remarks Also set by Get id and Make id to signal that the instruction was un successful Scale Basic 4 2E Reference Built in Functions Close id 142 Purpose use after Open id or Open new to save ID data to memory Remarks the Close id function and Write id instruction perform identical functions ID data is read into the ID registers by the Make id Get id and Index id instructions or by the Open id Open new Read first and Read next functions If any ID data is modified it must be written
55. ter it counts down to 0 This provides more accurate timing of repetitive events such as pulse outputs speed calculations interval timing etc Timer5 continues cycling until the Timer off 5 instruction is executed The If Else End if instructions are used to test condition codes If the condition code is true then the instructions after the If instruction are executed If the condition code in not true then the instructions after the If instruction are skipped until an Else or End if instruction is encountered The Flags are condition codes that programmer can set or reset The Flags are used to reflect a user defined state or status In this case Flag1 is used to indicate the state of the LED on off Example Timer 5 1 Set Keyboard Events Fl key Userl 2 In Timer Events Timer5 set time 2 function User2 Scale Basic 4 2E Tutorial 3 Scale Basic enter the following program Function Instructions Comments User 1 Timer on 5 turn on timer 5 End end of function User 2 If Flagl if LED flag Flag off 1 turn off LED flag Relay off 1 turn off LED Else Else Flag on 1 turn on LED flag Relay on 1 turn on LED End if End if End End of function 4 Upload the program to the indicator Press the F1 key The LED flashes at 0 2 second intervals In the above program the F1 key activates User 1 function which turns on Timer 5 When timer5 times out it simultaneously reactivates itself and activates User 2 func
56. the template above to enter the program 1 Invoke the EZ Link program 2 Click on Reset to Defaults to clear previous program 3 Set Keyboard Events Fl key Userl 4 In Setpoint Events Setpoint 1 set Upper Fixed43 Lower Net Function User2 5 In Fixed Registers Fixed43 enter 500 6 Scale Basic User 1 enter the following program Function Instructions Comments User 1 Copy Tare Gross Tare the scale Relay on Turn on fill valve Set pt on 1 Turn on setpoint monitor 1 End End of function 5 Scale Basic User 2 enter the following program Function Instructions Comments User 2 Relay off 1 Turn off fill valve End End of function Scale Basic 4 2E Tutorial 6 In EZ Link select File Save As then type in test3 then click OK This saves the program onto disk 7 In EZ Link select the UP Upload button Click on file test3 sf then click on OK 8 Press the F1 key on the indicator Press the Gross Net key to verify that the tare weight has been read The LED indicator should be on Relay out 1 Add 1000 lb to the scale using the scale simulator The LED light should turn off The first improvement for this program is to automatically change the display mode to Net display Function Instructions Comments User 1 Copy Tare Gross Tare the scale Turn on fill valve Turn on setpoint monitor 1 Display net weight End of function The next improvement is to get the target w
57. tion The result is that User 2 function is continuously activated every 0 2 seconds User 2 function turns the LED on if it was off or turns the LED off if it was on Tutorial Conclusion The tutorial is intended to get you started in Scale Basic programming The next steps to take to become proficient in Scale Basic programming are Read through the Reference section of this manual Become familiar with the scale basic instructions Try modifying the example programs used in the tutorial Use instructions that were not used in the tutorial Become familiar with the programs in the Application Library Use the Application Library programs as starting points for your own program Practice modifying the Application Library programs Use the Scale Basic Design Template see the appendix to create your own application programs Scale Basic 4 2E Reference Reference The reference is divided into 3 sections 1 Instruction Reference details each Scale Basic instruction and provides examples 2 Condition Codes details the condition codes and how they are used 3 Built in Functions the built in functions that can be used with Gosub and Goto instructions Instruction Reference Add r a b 200 r a b Purpose add registers a amp b put the result into register r Remarks add any two registers together and put the results into a third register Sets condition codes Positive Negative and Zero to reflect
58. to enter setpoint parameters Scale Basic 4 2E Reference Example Purposel trigger user function 1 when gross weight is greater than Memory register 12 weight above setpoint Upper register Memory12 Lower register Gross Execute Function Userl trigger user function 2 when Memory register 12 is greater than Gross weight weight below setpoint Upper register Gross Lower register Memory12 Execute Function User2 Example Purpose2 trigger user function 6 when scale is stable motion false Upper register False Lower register Motion Execute Function User6 trigger user function 9 when TTL input 3 is high true inactive Upper register True Lower register Input3 Execute Function User9 Scale Basic 4 2E Reference Timer Events Purpose 1 to trigger a scale basic function after a set time interval Purpose 2 to wait an interval of time inside a scale basic function Remarks Timers are activated using the Scale Basic instruction Timer on t When a timer is activated the time interval is set into the timers countdown register The countdown register decrements by every 0 1 seconds When the countdown reaches 0 the Scale Basic function is executed There are 5 timer records that contain the following data Time interval P0 time interval in tenths of a second x0 1sec Max 6553 0 sec Execute Function P1 the scale basic function to execute when time out occurs Timers 1 4 must be reactivated with a Timer on instructi
59. to the ID registers by the Make id Get id and Index id instructions or by the Open id Open new Read first and Read next functions If any ID data is modified it must be written back to ID memory to make the change permanent The ID registers are cleared after a Write id instruction Example Get an ID number from the keyboard open make the ID get tare from keyboard save the data Get data Memory Get an ID number from the keyboard If not Clear key If NOT Clear key Make id Memory Open Make ID Get data Id2 put keyboard tare into ID register 2 Write id Save ID data End if End if End End of function Scale Basic 4 2E Reference Condition Codes The condition codes are used in the IF instruction to determine if the instructions following the IF are to be executed The arithmetic condition codes are set every time a calculation instruction is performed The Setpoint monitor condition codes are true if the monitor corresponding to the condition code is active The following table lists the condition codes Altunits 109 Purpose true if display is in alt units mode Barcode 111 Purpose true if bar code message has been received on Com Port 1 Centerz 104 Purpose true if scale is at center of zero Clear key 106 Purpose true if last key pressed was the Clear key Remarks the Clear key is used to abort an operation Test for this key after data entry Example Get data Memory1 Get the fill amount If not Clear
60. troduction to event driven computer program design Program Design The first step in computer programming is to create a program design The first mistake that a programmer can make is to give insufficient attention to designing a program Give extra attention to this phase of programming you will be well rewarded for your effort Programming will be easier and it will be less likely that you will have to start over again because the program doesn t do what the customer wants There are many books written on program design This manual uses the following program design process 1 describe the application Many times this will be provided by your customer 2 list the results outputs are to be accomplished 3 list the inputs are needed to get the results 4 describe the program functions that are needed The above process should be done with close consultation with the user of the program your customer Usually the customer describes the problem and the programmer takes notes and asks questions Then the programmer writes a draft of the program design asking the customer questions as they occur Then the customer is given a copy of the program design for approval At this time the programmer should go over the design with the customer to make sure that everything is covered Example a customer presents the following application Application Description The operator places containers on the scale and fills them with
61. uld key in data and then press the Enter key This includes ID number entry and Get data r instructions Examplel a bar code reader is connected to Port 1 The operator presses the F1 key which activates function 1 Fn 1 Gosub Open new open an ID or make new if not found Copy Id2 Gross Id2 the ID s tare register weight on the scale Gosub Close id Save ID data to memory End End of function Using this program the operator presses the F1 key The indicator prompts Id The operator scans a bar code label The bar code data is used for the ID number Scale Basic 4 2E Reference Example2 a bar code reader is used to read the tare weight for the scale Setpoint 1 is configured to trigger when a bar code message is received Function 1 reads the bar code data into the Tare register Setpointl Upper register True Lower register Barcode Function Userl Fn 1 Get data Tare read bar code data into the tare register End End of function Serial Communications Port 2 Input Purpose execute commands received by communications port 2 Remarks Communications port 2 operates by it s own event scanner It operates in the background unnoticed by the operator The following commands are recognized by communications port 2 NOTE xxx 3 digit number 1 255 nnnn up to 10 digit number lt cr gt ASCII carriage return 13 CR CU CV CW Purpose Read and write configuration data These commands are used by EZ L
62. unt presents us with a new type of event the Setpoint Monitor Recall from the previous section of this manual titled Event Driven Programming that the program structure is event action event action The first event is the F1 key The action is to begin the fill process tare the scale turn on fill valve turn on setpoint monitor When the setup is complete the process must wait for the next event Net weight gt setpoint amount Scale Basic 4 2E Tutorial The Setpoint Monitor is used to generate the next event When the setpoint event occurs it activates user function 2 which turns off the fill valve Event Function Comments Fl key User 1 Start Fill operation Setpoint 1 User 2 trigger when Net gt Fixed43 setpoint amount Configure the Setpoint 1 event with the Upper register Fixed43 and the Lower register Net weight register This will cause the setpoint to trigger when the Net weight gt greater than or equal to the value in Fixed 43 Configure the Setpoint 1 function to execute User 2 Register Fixed43 is chosen because the fill amount is fixed Data in the Fixed registers is written to EA ROM which remains unchanged by power loss Function Instructions Comments User 1 Copy Tare Gross Tare the scale Relay on 1 Turn on fill valve Set pt on 1 Turn on setpoint monitor 1 End End of function User 2 Relay off 1 Turn off fill valve End End of function Parameter Used for Fixed 43 setpoint amount Use
63. when a TTL input is activated shorted to ground Remarks TTL inputs 1 through 4 execute scale basic functions 1 through 4 The TTL inputs trigger when the input signal goes from TTL high to TTL low The TTL input will not re trigger until the TTL input returns to TTL high NOTE TTL inputs must be enabled by setting parameter 39 1 The automatic scan of TTL inputs thru 4 is useful for events that must be constantly monitored such as a STOP switch used in bulk weigh or an overload limit switch For conditions where the TTL input is monitored on a temporary basis such as a GO switch use the ability of the Setpoint Monitor to trigger on a condition code TTL input 6 Pulse Count Input TTL input 6 is scanned for signal pulses The maximum pulse rate is 450 pulses second each pulse must be low a minimum 1 1 ms and high a minimum of 1 1 ms The pulses are accumulated in the Count register 57 Each second the number of pulses that occurred in that second is stored in the Rate register 55 pulses second Events Serial Communications Input Port 1 amp Port 2 Serial Communications Port 1 Input Purpose receive data input Remarks port 1 receives data into a buffer until an ACCII carriage return 13 is received The condition code Barcode is set true when a message is received The data is copied to a message buffer where it is held for the next data input command Data input commands include any command where the operator wo

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