B&B Electronics RS-485 User's Manual
Contents
1. If I O has a APPEN DIX D reading of 1 the following would be received A A H 00 FF 01 FE Adding Data Field Comfirmation Where FFh is the complement of 0 and FEh is the complement of 1 The complement of number x can be calculated in QuickBasic as follows comp z NOT x AND amp HFF 485SDD16 1005 Manual Appendix D D 1 D 2 Appendix D 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104 Table D 1 Extended Commands Readl OLines addr RD VO msb O msb I O Isb I O Isb Set Output Lines addr SO I O no response msb I O msb I O Isb I O Isb Set Module addr SA new no response Address addr new addr Set Turn around addr SC x x Dela Define I O Lines addr SD I O no response msb I O msb I O msb I O msb Set Power up addr SS l O no response States msb I O msb I O Isb I O Isb H Read addr RC I O msb I O msb I O Configuration Isb I O Isb I O powerup msb states l O powerup msb states I O powerup Isb states I O powerup Isb states addr addr turn around delay turn around delay Where x is the required data byte and signifies the complement of the specified byte 485SDD16 1005 Manual Appendix D D 3 D 4 Appendix D 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road2. Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104
3. Running Demonstration Program sess 29 APPENDIX A iieri A 1 ASCII Character Codes seessss A 1 APPENDIX B inti DDR B 1 Hexadecimal Decimal Conversions B 1 APPENDIX Co cscs ict roett cetero cce een eerte C 1 Interface Modules for SDD16 Models C 1 DE T3259 ae icon d teet carat diR abere ta C a cf C 2 DBIMAG pm Er LE C 3 DBM 16 Interfacing esee C 4 Iriputs 2 1 maed ica Senate aS C 5 QuIpUtS cece ien ee ud eos C 7 DBM16 Specifications sene C 8 I Q Elegit recette e deine C 8 Inputs anii eed C 8 OUIDUIS cairn nd aL ae d e ae C 8 Power Supply 2 5 ti anit te feet Teens C 8 li ER C 8 Appendix D Adding Data Field Confirmation D 1 ii Table of Contents 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Chapter 1 Introduction 485SDD16 Features The 485SDD16 is a general purpose control module that operates through an RS 485 interface The 485SDD16 offers 16 discrete digital I O lines With these features the module can be used to sense external ON OFF conditions and to control a variety of devices Each of the sixteen I O lines can be defined as either an input or an output The digital outputs are CMOS compatible The digital inputs are CMOS TTL compatible The digital I O lines are avail
4. character time 1 baud rate 10 turn around delay character time data byte Command addr SC Argument turn around delay Response none ASCII Example 9SC Dec Example 9SC lt 04 gt Hex Example 9SC lt 04 gt Bin Example 9SC lt 00000100 gt Description Set module 9 s decimal 57 turn around delay to four character transmission times 9600 baud the turn around delay 4 17ms 485SDD16 1005 Manual 13 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Define I O Lines Command The Define I O Lines command is used to define each of the 16 I O lines as either an input or an output This command requires two data bytes Each data byte defines eight I O lines The first data byte defines the eight most significant I O lines 15 8 The second data byte defines the eight least significant digital I O lines 7 0 If a bit position is set to a 0 then the I O line will defined as an input If a bit position set to a 1 then the I O line will be defined as an output Command Haddr SD Argument I O msb I O Isb Response none ASCII Example OSDUA Dec Example OSD lt 85 gt lt 65 gt Hex Example OSD lt 55 gt lt 41 gt Bin Example 0SD lt 01010101 gt lt 01000001 gt Description Define module 0 s decimal 48 I O lines The first byte define I O lines 14 12 10 amp 8 as outputs and I O lines 15 13 11 amp 9 as inputs the se
5. 3 1 012 GND Ground ND Ground 6 Unused 6 8 i2Vdcinput 8 9 j OSO 9 10 VO 1 23 VO 7 23 11 VO 2 24 VO 6 24 1 00 I O Line 0 1 015 12 1 0 3 25 l O 5 25 GND Ground mo 12 12Vdc Input ITS Inductive load DBM16 Transient The DBM16 module provides buffering and increased power Suppression handling for all the sixteen I O lines of the SDD16 models Each of the I O lines can be programmed as an input or as an output by DBM16 Interfacing setting a jumper on the board The DBM16 plugs directly into the This section will show some general examples of how to SDD16 s DB25S I O Port connector Terminal blocks are provided interface the DBM16 I O lines to external devices Caution must be for all I O line power and ground connections Refer to Table C 2 taken not to exceed the DBM16 specifications failure to do so could An enclosure for the DBM16 is available result in damage to the DBM16 and will void the warranty Before connecting the DBM16 to the SDD16 module and connecting any external device to the DBM16 determine which I O lines on the SDD16 module are inputs and which are outputs Once the inputs and outputs are known set the jumpers on the DBM16 accordingly Refer to Figure C 2 485SDD16 1005 Manual Appendix C C 3 C 4 Appendix C 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433
6. The byte s value can be represented in decimal 0 255 format hexadecimal 00 FF format binary 00000000 11111111 format or as an ASCII character The fixed bytes of each command will be represented as ASCII characters For example the Read I O command contains the following ASCII characters and RD Refer to Table 3 1 However it is important to remember that an ASCII character has a numeric value Example the ASCII 0 zero does not have a numeric value of zero but has a value of 48 The decimal and hexadecimal equivalents of some ASCII characters are shown in Table 3 2 Some commands require additional data bytes to complete the command These data bytes may be represented in any of the formats list above Refer to Appendix A for more ASCII and decimal equivalents 485SDD16 1005 Manual 9 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Table 3 2 Equivalent Values ASCII 1 33 2h 0 48 30h D 6 4h k Lov T wa ph t R 8 5h Syntax Command strings consist of four to six bytes The first byte is the start of message byte The start of message byte is always the ASCII character The second byte is the address byte This byte allows each unit to have a unique address The factory default address is the ASCII 0 character The next two bytes are the command characters These bytes are ASCII characters and used to specify which
7. 1 Conversely to set an output LOW the corresponding bit position must be set to a 0 When reading I O lines any bit set to a 0 indicates the corresponding 1 O line is in the LOW state and any bit set to a 1 indicates the corresponding I O line is in the HIGH state Example 3 1 To set outputs 15 8 1 and 0 to a HIGH state and all other outputs to a LOW state shown in bold face MS Byte LS Byte Shown in binary 10000001 00000011 Shown in decimal 129 3 12841 2 1 Shown in hexadecimal 81 3 80h 1h 2h 1h Example 3 2 Reply from Read I O command shown in bold face MS Byte LS Byte Shown in binary 11001000 01010010 Shown in decimal 200 82 128 64 8 64 16 2 Shown in hexadecimal C8 52 80h 40h 8h 40h 10h 2h I O lines 15 14 11 6 4 1 are HIGH and all other I O lines are LOW 485SDD16 1005 Manual 11 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Read I O Lines Command The Read I O Lines command returns two data bytes that reflect the state of the I O lines The first data byte contains the most significant I O lines 15 8 The second data byte contains the least significant I O lines 7 0 If a bit is a 0 then the state of that I O line is LOW If a bit is a 1 then the state of that I O line is HIGH Command addr RD Argument none Response the state of the 16 I O lines in two 8 bit bytes shown in bold face ASCII Examp
8. 12 10 amp 8 are outputs and I O lines 15 13 11 amp 9 are inputs the second byte LSB of I O definitions I O lines 6 amp 0 are outputs and I O lines 7 5 4 3 2 amp 1 are inputs the third byte MSB of output power up states output lines 14 amp 12 HIGH and output lines 10 amp 8 LOW at power up the fourth byte LSB of output power up states output line 6 HIGH and output line 0 LOW at power up the fifth byte module address is set ASCII 9 decimal 57 the sixth byte turn around delay is a decimal 4 16 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Chapter 4 I O Interfacing This chapter will explain HIGH and LOW states and show some general examples of how to interface to the I O lines Caution must be taken not to exceed 485SDD16 specifications listed in Chapter 1 when interfacing to external devices Failure to stay within these specifications could result in damage to the unit and will void warranty Digital Inputs As stated earlier digital input lines are CMOS TTL compatible and can only handle voltages from OVdc to 5Vdc Digital inputs are used to sense a HIGH or a LOW state This can be accomplished via switch closures contact closures or a solid state digital signal When an I O line defined as an input senses a voltage level above 2 0Vdc it will be considered HIGH and it s input state will be read
9. 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104 Figure C 2 DBM16 Outline Drawing Inputs Digital inputs are used to sense HIGH and LOW states based on voltage levels This is accomplished via switch closures contact closures or a solid state digital signals Each DBM16 input is pulled up through a resistor and will be read as a logic 1 HIGH by the SDD16 module When an input on the DBM16 is grounded below 1 5Vdc a logic 0 LOW will be read by the SDD16 module Figures C 3 C 6 show examples of some typical input interfaces gt S oe bh Figure C 3 Switch Input 485SDD16 1005 Manual Appendix C C 5 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Vi N e v 7A Figure C 4 Solid State Input Figure C 5 Isolated Mechanical Input DBM16 XTERN CIRCUI Figure C 6 Isolated Solid State Input C 6 Appendix C 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Outputs Digital outputs are used to turn ON or turn OFF external devices Outputs can be used to control solid state output modules logic circuits and relays Caution must be taken not to exceed the power capability of the outputs Refer to the DBM16 output specifications Setting the SDD16 module s output line to a 1 turns ON the DBM 16 s output line Setting the SDD16 module s output line t
10. 8 will be defined as an Input LOW of module 4 All other I O definitions will not be changed Set Power up States Command The Set Power up States command is used to set the states of the digital outputs at power up This command requires two data bytes Refer to this command in Chapter 3 for more information Step 1a Construct the command string Set appropriate outputs power up states HIGH MSpups MSpups OR mask LSpups LSpups OR mask By ORing the current power up states with the appropriate mask of a digital output line the power up state s data bit will be set to a 1 HIGH 26 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Step 1b Set appropriate outputs power up states LOW MSpups MSpups AND NOT mask LSpups LSpups AND NOT mask By ANDing the current power up states with the complement of the appropriate mask of a digital output line the power up state s data bit will be set to a 0 LOW Step 1c Completing the command string Cmnd I CHR Maddr SS CHR MSpups CHR LSpups Step 2 Transmitting the command string Print 1 Cmnd Example 5 5 Set Output 5 s power up state HIGH and Output 13 s power up state LOW on module 4 Set module address to 4 Maddr 4 Set bit O of LSpups to make Output 5 s power up state HIGH LSpups LSpups OR amp H20 Clear bit 4 of MSpups to make Output 13 s pow
11. 815 433 5100 FAX 815 433 5104 B0 cus P TAS ire es WwW B1 piatu is Q 120 tens X HA al R ADA alo y B3 oun S 122 nurus Zz B4 i aeea T MOS PN B5 ra nS U dox N cee eee V T25 Sci tas Bf uisi W 126 sinia 88 Lou usus X PATE DEL 89 Gus Y 128 5 is 90 i s Z 129 Of oci AGO BN 92 xut en Me conde teh OG NEC S e m 3 Pr serv ssl dh odes Si ital sus OB rs betae A 255 cen 96 s 9f AE ET a 98 ESS b 99 cxt C 100 ix d TOT ccm e 102 2 52 22 f 103 5 oru g NOM nes rere at h 105 i 106 1 ursus j TOT nomas k 108 2 l 109i zin m a Pk K OEE n Tae onein o 119 52 0 p AAS CEN q Tad ri r VAS 2i S AVG 5 cet t TA edits hs Sete u 118 ie V 485SDD16 1005 Manual Appendix A A 3 A 4 Appendix A 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104 The decimal base 10 numbering system represents each position in successive powers of 10 with each decimal symbol having a value from 0 to 9 The hexadecimal base 16 numbering system represents each position in successive powers of 16 with each hex symbol having a value of 0 to 15 Since each hex position must have a single symbol the symbols A through F are assigned to values 10 through 15 respectively Refer to Table 1 The information and examples to follow will explain how to convert from
12. I O line the status of the I O line can be determined If the status is equal to zero the I O line is LOW If the status is not equal to zero the I O line is HIGH Table 5 1 shows the mask values for each I O line Step 6 Repeat Step 5 until the status of each I O line has been determined 485SDD16 1005 Manual 21 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Example 5 1 Determining the status of I O lines 2 amp 10 of module 5 Maddr 5 mask amp H4 Cmnd I CHR Maddr RD PRINT 1 Cmnd MSIO INPUT 1 1 LSIO INPUT 1 1 MSIO ASC MSIO LSIO ASC LSIO MSstatus MSIO AND mask LSstatus LSIO AND mask If LSstatus equals zero then I O line 2 is LOW If LSstatus is not equal to zero then I O line 2 is HIGH If MSstatus equals zero then I O line 10 is LOW If MSstatus is not equal to zero then I O line 10 is HIGH Table 5 1 Digital I O Mask Values mie I O Line Hexadecimal Decimal Read Configuration Command The Read Configuration command reads the module s I O definitions Power up states Address and Turn around delay respectively Refer to this command in Chapter 3 for more information Step 1 Constructing the command string Cmnd I CHR Maddr RC Where Maddr is the address of the module that is to return its configuration Step 2 Transmitting the command string PRINT 1 Cmnd 22 485SDD16
13. a decimal number to a hexadecimal number and vice versa Table 1 Decimal Hexadecimal Value Symbol APPENDIX B Hexadecimal Decimal Conversions 485SDD16 1005 Manual Appendix B B 1 B 2 Appendix B 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104 Hexadecimal to Decimal Conversion Decimal 1st Hex digit x 4096 2nd Hex digit x 256 3rd Hex digit x 16 4th Hex digit Each Hex digit is the decimal equivalent value of the hexadecimal symbol Example Convert 10FC hexadecimal to decimal 1 x 4096 4096 0 x 256 0 15 x 16 240 12 x 1 12 4348 10FC hex equals 4348 decimal Decimal to Hexadecimal Conversion Example Convert 4348 decimal to hexadecimal 4096 4348 4096 256 252 0 16 252 240 1 12 12 0 4348 decimal equals 10FC hexadecimal 1 1 1st Hex digit 0 0 2nd Hex digit 15 F 3rd Hex digit 12 C 4th Hex digit 485SDD16 1005 Manual Appendix B B 3 B 4 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Appendix B 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 APPENDIX C Interface Modules for SDD16 Models 485SDD16 1005 Manual Appendix C B amp B Electronics 707 D
14. 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Step 3 Receiving the data MSdefs INPUT 1 1 LSdefs INPUT 1 1 MSpups INPUT 1 1 LSpups INPUT 1 1 Maddr INPUT 1 1 Mtdly INPUT 1 1 Step 4 Manipulating the data MSdefs ASC MSdefs LSdefs ASC LSdefs MSpups ASC MSpups LSpups ASC LSpups Maddr ASC Maddr Mtdly ASC Mtdly Step 5 Determining the I O line definitions MSdefs MSdefs AND mask LSdefs LSdefs AND mask By ANDing the value of MSdefs or LSdefs with the appropriate mask of an I O line the I O line definition can be determined If the status is equal to zero the I O line is an INPUT If the status is not equal to zero the I O line is an OUTPUT Table 5 1 shows the mask values for each I O line Step 6 Repeat Step 5 until the status of each I O line has been determined Step 7 Determining an OUTPUT s Power up state MSpups MSpups AND mask LSpups LSpups AND mask By ANDing the value of MSpups or LSpups with the appropriate mask of an Output line the Output line definition can be determined If the status is equal to zero the Output power up state will be LOW If the status is not equal to zero the Output power up state will be HIGH Table 5 1 shows the mask values for each I O line Step 8 Repeat Step 7 until the power up state of each Output line has been determined Example 5 2 Determinin
15. 2 amp 1 LOW Note If any of these lines are defined as inputs the bit settings are ignored 12 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Set Module Address Command The Set Module Address command is used to change the address of a 485SDD16 This commands requires one data byte This data byte is used to specify the module s new address Addresses can be assigned any decimal value from 0 to 255 The address is stored in non volatile memory and is effective immediately Each module must be assigned its own unique address when connected to an RS 485 muti node network Command addr SA Argument new address Response none ASCII Example OSA9 Dec Example OSA lt 57 gt Hex Example 0SA 39 Bin Example 0SA lt 00111001 gt Description Change module address from ASCII 0 48 decimal to address ASCII 9 57 decimal Set Turn around Delay Command The Set Turn around Delay command sets the amount of time the 485SDD16 waits before transmitting its response This ensures that no two drivers are enabled at the same time on a two wire RS 485 network The turn around delay is stored in non volatile memory This command requires a data byte that specifies the turn around delay Where turn around delay is a number from 0 to 255 One unit of turn around is equal to one character transmission time The turn around delay can be computed as follows
16. 433 5100 FAX 815 433 5104 y vy A 4 SS N N Figure 4 6 Isolated Solid State Output 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Chapter 5 Software This chapter will be divided into two sections The first section covers programming techniques for constructing a command string receiving data and manipulating data in QuickBASIC The second section discusses how to install and run the demonstration program on an IBM PC or compatible Programming Techniques This section shows steps and examples of programming the 485SDD16 in QuickBasic If you are programming in another language this section can be helpful as a guideline for programming the 485SDD16 Read I O Lines Command The Read I O Lines command returns two data bytes that represents the states of the module s I O lines Refer to this command in Chapter 3 for more information Step 1 Constructing the command string Cmnd CHR Maddr RD Where Maddr is the address of the module that is to return its I O states Step 2 Transmitting the command string PRINT 1 Cmnd Step 3 Receiving the data MSIO INPUT 1 1 LSIO INPUT 1 1 Step 4 Manipulating the data MSIO ASC MSIO LSIO ASC LSIO Step 5 Determining an I O s status MSstatus MSIO AND mask LSstatus LSIO AND mask By ANDing the value of MSIO or LSIO with the appropriate mask of an
17. 85SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Power Supply Input Voltage 8 Vdc to 16 Vdc 35 milliamps Doesn t include the power consumption of external devices Connection Terminal Blocks or DB 25S Communications Standard RS 422 485 Addresses 256 Factory default 48 decimal Turn around Delay Software programmable from 0 to 255 character transmission times Factory default 1 Baud Rate 1200 to 9600 automatic detection Format 8 data bits 1 stop bit no parity Connection Terminal Blocks Optical Isolation If optical isolation is required use B amp B s 485HSPR high speed optically isolated converter with this product Size 0 7 x 2 1 x 5 2 485SDD16 1005 Manual 3 4 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH 815 433 5100 FAX 815 433 5104 Chapter 2 Connections This chapter will cover the connections required for the 485SDD16 There are three sets of connections digital I O serial port and power supply Do not make any connections to the 485SDD16 until you have read this chapter Digital I O Connections Connections to the I O lines are made through the DB25S female I O port connector Refer to Table 2 1 See Chapter 5 for I O interfacing examples Digital Inputs The digital input
18. DD16 1005 Manual Appendix C C 9 C 10 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Appendix C 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 With serial communications in a laboratory environment the possibility of a communication error occurring is minimal However in a harsh or an industrial environment the possibility increases A communication error occurs when a bit transmitted as a 1 is received as a 0 or vice versa If the 485SDD16 receives a error in one or more of the first four command characters 0xx the unit will not execute the command However if the 485SDD16 receives an communication error on a data byte I O byte for Read Digital command or state byte for Set Output State command the command will be executed since the unit has no way of knowing that there was an error To provide the 485SDD16 with a way of detecting errors in the data fields an additional set of commands can be used This set of commands begins with the 23h character instead of the 21h character Refer to Table D 1 With these commands every data byte that is transmitted or received is followed by its complement For example To read I O lines Command syntax addr RD Response syntax I O msb I O msb I O Isb I O Isb Where is used to indicate the complement of
19. RS 485 Digital YO Module Model 485SDD16 Document ation Number 485SDD16 1005 This product Designed and Manufactured In Ottawa Illinois USA of domestic and imported parts by B amp B Electronics Mfg Co Inc 707 Dayton Road P O Box 1040 Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Internet http www bb elec com sales bb elec com support bb elec com B amp B Electronics Revised February 2005 485SDD16 1005 Manual Cover Page B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Table of Contents Chapter 1 Introduction 1 485SDD16 Features essere 1 Packing HEIGL coit pire qa m aae tacet ce 2 485SDD16 Specifications ssse 2 VO l iness siete coted ester Poder idu 2 IripUts i eerte Ge e 2 Outputs named aste be eet 2 Power SUpply 3 2 ee et dee eie tee Ren 3 Communications sess 3 SZE ele ee 3 Chapter 2 Connections 5 Digital O Connections esessesss 5 Digital Inputs oie cde de eie tecnici pec tert 5 Digital O tputs coe ue epe Riiie 5 eren E 5 Serial Port Connections sseeesss 6 Power Supply Connections sssss 8 Chapter 3 Commands 9 Synta a Vodac
20. able through a DB 25S female connector The 485SDD16 connects to the host computer s RS 485 or RS 422 serial port using terminal blocks The address and turn around delay are software programmable to allow for use of multiple devices or connection to existing multi node systems The unit automatically detects baud rates from 1200 to 9600 A data format of 8 data bits 1 stop bit and no parity is used Configuration parameters are stored in non volatile memory These parameters consists of module address communication turn around delay I O definitions and output power up states The unit is powered by connecting 12Vdc to terminal blocks or to the DB 25S I O connector Figure 1 1 485SDD16 Module 485SDD16 1005 Manual 1 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Figure 1 2 Simplified Block Diagram Packing List Examine the shipping carton and contents for physical damage The following items should be in the shipping carton 1 485SDD16 unit 2 Software 3 This instruction manual If any of these items are damaged or missing contact B amp B Electronics immediately 485SDD16 Specifications 1 0 Lines Total 16 Factory default inputs Inputs Voltage Range 0 Vdc to 5 Vdc Low Voltage 1 0 Vdc max High Voltage 2 0 Vdc min Leakage Current 1 microamp max Outputs Low Voltage 0 6 Vdc 8 3 milliamps Sink High Voltage 4 3 Vdc 3 1 milliamps Source 2 4
21. as a 1 Conversely when an input senses a voltage level below 1 0Vdc it will be considered LOW and it s input state will be read as a 0 Inputs can also be used to sense AC voltages by using mechanical or solid state relays Solid state relays are available from many manufacturers Figures 4 1 4 4 show examples of some typical input interfaces Figure 4 1 Switch Input 485SDD16 1005 Manual 17 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Figure 4 2 Solid State Input d X e rd e Figure 4 3 Isolated Mechanical Input 18 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 AN e Figure 4 4 Isolated Solid State Input Digital Outputs Digital outputs are used to turn on or turn off external devices Digital outputs are CMOS compatible and operate between OVdc and 5Vdc Outputs can be used to control solid state output modules CMOS and TTL logic circuits Caution must be taken not to exceed the power capability of the outputs Refer to the output specifications in Chapter 1 Setting an output line to a 1 forces the output HIGH and setting an output line to a O forces the output LOW Figures 4 5 4 6 show examples of some typical output interfaces Figure 4 5 Solid State Output 485SDD16 1005 Manual 19 20 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815
22. ayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 C 1 DTB25 The DTB25 connects to the SDD16 models to provide easy access to the available I O lines The DTB25 plugs directly into the SDD16 s DB25S I O port connector Each of the twenty five pins on the connector is brought out to a terminal block Refer to Table C 1 Dimensions 0 5 x 2 1 x 4 3 An enclosure for the DTB25 is available TENA r Figure C 1 DTB25 Outline Drawing Before connecting any external devices to the DTB25 make sure the SDD16 module has been properly configured I O lines defined power up states set This will avoid possible damage to the module and to the external devices Make sure not to exceed the voltage and current limits of the SDD16 module failure to do so could result in damage to the module and will void the warranty Refer to the Specification Section of this Manual C 2 Appendix C 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Table C 2 DBM16 I O Connections Table C 1 DTB25 Connections T B 2 DB 25P atu DB 25P TELS Function Label Function Pin Function Pin Function 1 07 I O Line 7 l O Line 8 1 Unused 1 14 I O 15 14 GND Ground 2 Unused 2 15 l O 14 15 06 l O Line 6 09 I O Line 9 I O 13 05 1 0 Line 5 1 010 I O Line 10 VO 12 GND Ground O 11 1 04 I O Line 4 O11 V O Line 11 1 03 I O Line
23. command will be executed by the module Some commands require an argument field containing a fifth and sometimes a sixth data byte Commands that manipulate I O lines require two data bytes a Most Significant and a Least Significant data byte respectively Command Syntax 6th Data Byte I 5th Data Byte o 2nd Command Byte 1stCommand Byte Address Byte Start of Message Byte I O Data Bytes When constructing commands to manipulate output lines or when reading the state of the I O lines it is necessary to know how to select and interpret the I O data bytes The sixteen I O lines are represented by two data bytes The Most Significant data byte represents I O lines 15 through 8 and the Least Significant data byte represents I O lines 7 through 0 The Most Significant byte is always sent and received first followed by the Least Significant byte 10 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 A byte represents an eight bit binary number 11111111 therefore each byte can represent eight I O lines Each bit is assigned a bit position and a weight value Refer to Table 3 3 Table 3 3 Bit Assignments for I O Lines MOST SIGNIFICANT I O BYTE Bit Position Hex Weight 80 40 20 10 8 4 To set an output to a HIGH state the corresponding bit position must be set to a
24. cond byte define I O lines 6 amp 0 as outputs and I O lines 7 5 4 3 2 amp 1 as inputs 14 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Set Power up States Command The Set Power up States command is used to set the states of output lines when the module s power is recycled This command requires two data bytes These data bytes specify the output state of each output line The first data byte represents the eight most significant I O lines 15 8 The second data byte represents the eight least significant I O lines 7 0 If a bit position is set to a 0 then the state of that output line will be set LOW If a bit position is set to a 1 then the state of that output line will be set HIGH Command addr SS Argument I O msb I O Isb Response none ASCII Example 0SSU Dec Example 0SS lt 219 gt lt 64 gt Hex Example 0SS lt DB gt lt 40 gt Bin Example 0SS lt 11011011 gt lt 01000000 gt Description Set module 0 s decimal 48 power up states The first byte sets output lines 15 14 12 11 9 amp 8 HIGH and output lines 13 amp 10 LOW at power up the second byte sets output line 6 HIGH and output lines 7 5 4 3 2 1 amp O LOW at power up NOTE If any of these lines are defined as inputs the bit settings are ignored Read Configuration Command The Read Configuration command returns the module s I O definiti
25. dule Therefore any current that is sourced by the digital outputs must be added to this value and the current must not exceed the maximum output source current Refer to the 485SDD16 Specification Section of Chapter 1 8 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Chapter 3 Commands There are only two commands required to control the 485SDD16 set output lines and read I O lines Five additional commands are used for configuring the module set module address set turn around delay define I O lines set power up states and read configuration Command strings are from four to six bytes in length the I character an address byte two command characters and one or two data bytes if required See Table 3 1 Table 3 1 485SDD16 Commands I O msb I O Isb Set Output Lines Maddr SO l O msbMl O Is Set Module Address Maddr SAfnew adr Set Turn around Haddr SC no response Delay Define I O Lines Yaddr SD I O msb I O Isb no response l Set Power up States Naddr SS I O msbMI O Isb bj I O Definitions Read Configuration Yaddr RC I O msb I O Isb Power up States I O msb l O msb RS 485 Config addr t a delay Symbols represents one byte lt gt represents a numeric value Before going into the specifics of each command it is important to understand that a byte has a numeric value from 0 to 255
26. er up state LOW MSpups MSpups AND NOT amp H20 Cmnd CHR Maddr SS CHR MSpups CHR LSpups PRINT 1 Cmnd MSIO INPUT 1 1 Module s 4 output line 5 s power up state will be set HIGH and output line 13 s power up state will be set LOW All other output power up states will not be changed Set Module Address Command The Set Module Address command is used to change the address of the 485SDD16 This command requires a data byte The data byte is used to specify the new address of the module Step 1 Construct the command string Cmnd CHR Maddr SA CHR Naddr Where Maddr if the module s current address and Naddr is the module s new address Step 2 Transmitting the command string Print 1 Cmnd 485SDD16 1005 Manual 27 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Example 5 6 Change the address of module with a current address of 4 decimal to the new address of 5 decimal Maddr 4 Naddr 5 Cmnd I CHR Maddr SA CHR Naddr Print 1 Cmnd Set Turn around Delay Command The Set Turn around Delay command is used to set the amount of time the module will wait after receiving a command before it sends the response message This ensures that no two communication drivers will be enabled at the same time and is necessary when multiple modules share the same communica tion lines The command requires one data byte
27. g the definition and power up state of I O lines 2 amp 10 of module 5 485SDD16 1005 Manual 23 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Maddr 5 mask amp H4 Cmnd I CHR Maddr RC PRINT 1 Cmnd MSdefs INPUT 1 1 LSdefs INPUT 1 1 MSpups INPUT 1 1 LSpups INPUT 1 1 Maddr INPUT 1 1 Mtdly INPUT 1 1 MSdefs ASC MSdefs LSdefs ASC LSdefs MSpups ASC MSpups LSpups ASC LSpups Maddr ASC Maddr Mtdly ASC Mtdly MSdefs MSdefs AND mask LSdefs LSdefs AND mask MSpups MSpups AND mask LSpups LSpups AND mask If LSdefs equals zero then I O line 2 is an INPUT and if not equal to zero then I O line 2 is an OUTPUT If MSdefs equals zero then I O line 10 is an INPUT and if not equal to zero then I O line 10 is an OUTPUT If LSpups equals zero then Output line 2 s power up state is LOW and if not equal to zero then Output line 2 s power up state is HIGH If MSpups equals zero then Output line 10 s power up state is LOW and if not equal to zero then Output line 10 s power up state is HIGH Maddr is the decimal address of the module Mtdly is the decimal number of character times that make up the turn around delay Set Output States Command The Set Output States command is used to set the states of any I O line that is defined as an output This command requires two data bytes Refer to this command
28. ie Connection is required Loop to Data B TD B for 2 wire hookup 12 Vdc Connection is required Power pele eee Power Supply GND A typical 2 wire RS 485 connection is shown in Figure 2 3 and a typical RS 422 or RS 485 4 wire connection is shown in Figure 2 4 Note that the 485SDD16 data line labels use A and B designators per EIA RS 485 Specification However some RS 485 equipment uses and as designators In almost all cases the A line is the equivalent of the line and the B is the equivalent of the line With an RS 485 422 system there are other factors that require consideration such as termination and turn around delay For more information refer to B amp B Electronics free RS 422 485 Application Note 6 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Figure 2 2 RS 485 2 wire Connection 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Figure 2 3 RS 422 4 wire Connection Power Supply Connections Power to the 485SDD16 must be supplied by an external power supply connected to the 12Vdc and GND terminal blocks or to the I O connector An external power supply must be able to supply 8 to 16 Vdc at 35ma NOTE Power requirements of the module does not include the power consumption of any external devices connected to the mo
29. in Chapter 3 for more information Step 1a Construct the command string Set appropriate outputs HIGH MSstates MSstates OR mask LSstates LSstates OR mask By ORing the current states with the appropriate mask of a digital output line the output s bit will be set to a 1 HIGH 24 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Step 1b Set appropriate outputs LOW MSstates MSstates AND NOT mask LSstates LSstates AND NOT mask By ANDing the current states with the complement of the appropriate mask of a digital output line the output s bit will be set to a 0 LOW Step 1c Completing the command string Cmnd I CHR Maddr SO CHR MSstates CHR LSstates Step 2 Transmitting the command string Print 1 Cmnd Example 5 3 Set Output 0 HIGH and Output 14 LOW of module 5 Set module address Maddr 5 Set bit O of LSstates to make Output 0 HIGH LSstates LSstates OR amp H1 Clear bit 4 of MSstates to make Output 14 LOW MSstates MSstates AND NOT amp H40 Cmnd I CHR Maddr SO CHR MSstates CHR LSstates PRINT 1 Cmnd Output 0 will be set HIGH and output 14 will be set LOW of module 5 All other output settings of module 5 will not be changed Define I O Lines Command The Define I O Lines command is used to define each of the module s I O lines as either an input or a
30. le ORDER Dec Example ORD lt 200 gt lt 82 gt Hex Example 0ORD C8 52 Bin Example 0RD 11001000 01010010 Description Read module 0 s decimal 48 I O lines The first byte indicates that I O lines 15 14 amp 11 are HIGH and I O lines 13 12 10 9 amp 8 are LOW the second byte indicates that I O lines 6 4 amp 1 are HIGH and I O lines 7 5 3 2 amp 0 are LOW Set Output Lines Command The Set Output Lines command is used to set the states of the output lines This command requires two data bytes These data bytes specify the output state of each output line The first data byte represents the most significant I O lines 15 8 The second data byte represents the least significant I O lines 7 0 If a bit position is set to a 0 then the state of that output line will be set LOW If a bit position is set to a 1 then the state of that output line will be set HIGH NOTE Refer to the Define I O Lines command to define an I O line as an output Command addr SO Argument I O msb I O Isb Response none ASCII Example OSOUA Dec Example 0SO lt 85 gt lt 65 gt Hex Example 0SO lt 55 gt lt 41 gt Bin Example 080 010101012 01000001 Description Set module 0 s decimal 48 output lines The first byte sets output lines 14 12 10 amp 8 HIGH and output lines 15 13 11 amp 9 LOW the second byte sets output lines 6 amp O HIGH and output lines 7 5 4 3
31. lectronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 30 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Decimal ASCII Decimal ASCII pondus NUL SO eee ein Tiea eto dtes SOH AO eeeseeeee 2 Later les STX A sene ETX BD uat t 4 iuda EOT 43 uiu D acis ENQ Yn D nbus ACK 45 o oet To assu BEL 46 ionis B ESTEA BS AT sisse is ore HT 48 i 0 10 ius LF 49 oss 1 dossier VT Dc erstes 2 2 orar directe FF 51 erue 3 19 Sader CR B2 eniin 4 Df eee eee SO DO dst 5 T5 cessat amets SI rS ute ties as 6 16 iiia DLE DT Lxususe 9 dM A EE DC1 DOcs s eei WG ESEE DC2 b ets itta 19 ases DC3 60 asa lt 20 5 eee DC4 01 5 toeeetetss 2 naei NAK 62 inus gt APPENDIX A ae eee SYN Od Be eec 23 ies ETB 64 Lecce ASCII Character Codes PE CMM CAN Bs us A 25 it EM o oH E B PA nte un SUB Dy C 2 iactis ESC 68 R E E D 20 a tule FS OOF tree F E 29 eei GS 0 xu F BO usd RS TA nins G F etai a US TEA EME H 32 iius SP TE uus GS xtate athe T4 eese J BA 5 oneris 75 ceil K 35 keen 16 usu L JO reo DERI DE M di statem 96 POG 2 end ee N 38 iussu amp 19 ases O 485SDD16 1005 Manual Appendix A A 1 A 2 Appendix A 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 PH
32. lines are CMOS TTL compatible and can handle voltages from OVdc to 5Vdc Digital Outputs The digital output lines have a maximum voltage of 5Vdc and are CMOS compatible Ground This pin should be connected to the external digital devices ground Table 2 1 485SDD16 I O Port Pinout DB 25S DB 25S Pin Function Pin Function 5 No connection No connection 19 1 O 10 Ground 20 No connection 8 12Vdc Input 21 1 0 9 9 jvOS0 Mos 0 ar Pee 485SDD16 1005 Manual 5 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Serial Port Connections In order to communicate to the 485SDD16 module it must be connected to an RS 422 RS 485 serial port The 485SDD16 will work on a 2 wire or 4 wire RS 485 multi node network Refer to B amp B Electronics free RS 422 485 Application Note for more information The unit automatically detects baud rates from 1200 to 9600 A data format of 8 data bits 1 stop bit and no parity is used Connections are made using terminal blocks Table 2 2 shows the terminal blocks and their functions Table 2 2 RS 485 Terminal Block Connections Signal TB Direction at Label Label Signal 485SDD16 Notes 485SDD16 Notes ee re GND Ground SU is required Loop to Data A A for 2 wire hookup Connection is required Loop to Data B for 2 wire hookup COLE ion is required Loop to Data A TD A for 2 wire hookup Ros
33. n output This command requires two data bytes Refer to this command in Chapter 3 for more information Step 1a Construct the command string Define an I O line as Output MSdefs MSdefs OR mask LSdefs LSdefs OR mask By ORing the current definitions with the appropriate I O line mask the I O line s data bit will be set to a 1 HIGH and the I O line will be defined as an Output 485SDD16 1005 Manual 25 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Step 1b Define an I O line as an Input MSdefs MSdefs AND NOT mask LSdefs LSdefs AND NOT mask By ANDing the current definitions with the complement of the appropriate O line mask the I O line s data bit will be set to a 0 LOW and the I O line will be defined as an Input Step 1c Completing the command string Cmnd I CHR Maddr SD CHR MSdefs CHR LSdefs Step 2 Transmitting the command string Print 1 Cmnd Example 5 4 Define I O line 7 as an Output HIGH and I O line 8 as an input LOW on module 4 Set module s address to 4 Maddr 4 Set bit 7 of LSdefs to make I O line 7 an Output HIGH LSdefs LSdefs OR amp H80 Clear bit 0 of MSdefs to make I O line 8 an Input LOW MSdefs MSdefs AND NOT amp H1 Cmnd I CHR Maddr SD CHR MSdefs CHR LSdefs PRINT 1 Cmnd MSIO INPUT 1 1 I O 7 will be defined as an Output HIGH and I O line
34. o a 0 turns OFF the DBM16 s output driver The DBM16 outputs are open collector current sinking drivers Figures C 7 C 9 show examples of some typical output interfaces DBM16 A y e S E P gt of IE e e Figure C 7 Solid State Output DBM16 L 3 I e gt E Figure C 8 Isolated Mechanical Output 485SDD16 1005 Manual Appendix C C 7 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 DBM16 S A ke E Figure C 9 Isolated Solid State Output DBM16 Specifications 1 0 Lines Total 16 Factory default set to inputs Inputs Voltage range OVdc to 50Vdc Low Voltage OVdc to 1 5Vdc High Voltage 2 5Vdc to 50Vdc Internal pull up current 0 5 ma Outputs Output Voltage 50Vdc max Output current 350 ma max only 1 output on 100 ma max all outputs on Output leakage current 50 micro amp max Output saturation voltage 1 1Vdc max 100ma CAUTION Total output power cannot exceed 2 watts for I O s 0 7 and 2 watts for I O 48 15 25 degrees C Power Supply Input Voltage 8Vdc to 16Vdc 10milliamps Doesn t include the power consumption of external devices Connections Terminal Blocks Size 0 5 x 2 1 x 4 5 C 8 Appendix C 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 a D Figure C 10 DBM16 Schematic 485S
35. ons the outputs power up state the module s address and the turn around delay Six data bytes are returned The first two data bytes contain the definition of the eight most significant I O lines 15 8 and the eight least significant I O lines 7 0 respectively If a bit position is set to a 0 the I O line is defined as an input if set to a 1 the I O line is defined as an output The second two data bytes contain the power up states of the most significant output lines 15 8 and the least significant output lines 7 0 respectively If a bit position is set to a 0 the power up state of the output will be LOW if set to a 1 the output will be HIGH The fifth data byte is the module s address The sixth data byte is the turn around delay Command addr RC Argument none Response definition of the sixteen I O lines in two 8 bit bytes and the power up states in two 8 bit bytes shown in bold face 485SDD16 1005 Manual 15 B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 ASCII Example 9RCUAP 29 Dec Example 9RC lt 85 gt lt 65 gt lt 80 gt lt 64 gt lt 57 gt lt 04 gt Hex Example 9RC lt 55 gt lt 41 gt lt 50 gt lt 40 gt lt 39 gt lt 04 gt Bin Example 0ORC 010101012 01000001 01010000 01000000 lt 00111001 gt lt 00000100 gt Description Read module 9 s decimal 57 configuration The first byte MSB of I O definitions I O lines 14
36. tes aeta Hae ute deve tod acuerdo Pra taedas 10 VO Data Bytes eere derer org 10 Read I O Lines Command 12 Set Output Lines Command 12 Set Module Address Command 13 Set Turn around Delay Command 13 Define I O Lines Command 14 Set Power up States Command 15 Read Configuration Command 15 Chapter 4 I O Interfacing 17 Digital INDUIS 65552 9 ro cope iste ees 17 Digital OUIDUlS v oet etr har native reet 19 485SDD16 1005 Manual Table of Contents B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Chapter 5 Software sess 21 Programming Techniques ss 21 Read I O Lines Command eee 21 Read Configuration Command esses 22 Set Output States Command sess 24 Define I O Lines Command eene 25 Set Power up States Command sssssuss 26 Set Module Address Command sess 27 Set Turn around Delay Command esee 28 Demonstration Program ssesesssss 29 Hard Drive Installation Error Bookmark not defined
37. to specify the turn around delay Refer to this command in Chapter 3 for more information Step 1 Construct the command string Cmnd I CHR Maddr SC CHR Ntdly Where Maddr if the module s address and Ntdly is the module s new turn around delay Step 2 Transmitting the command string Print 1 Cmnd Example 5 7 Set the turn around delay of module 5 to 10 character times Maddr 5 Ntdly 10 Cmnd I CHR Maddr SC CHR Naddr Print 1 Cmnd 28 485SDD16 1005 Manual B amp B Electronics 707 Dayton Road Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5104 Demonstration Program The 485SDD16 Demonstration SDD16 Program IBM PC or Compatible provides the user with examples of how to receive and transmit commands to the 485SDD16 The SDD16 EXE is the executable program the SDD16 BAS file is the source code in QuickBASIC The source code provides an illustration of how to send and receive commands from the 485SDD16 NOTE This is a demonstration program only and not intended for system applications Running Demonstration Program Before you can run the demonstration program you must run the install program in the Hard Drive Installation section If you are running Windows exit Windows to DOS To run the program follow these steps from the DOS prompt 1 Type CD 485SDD16 and press the Enter key 2 Type SDD16 and press the Enter key 485SDD16 1005 Manual 29 B amp B E
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