manual for maxdde
Contents
1. GET CHARACTER F6 C BOOO LDAB PORTA LABEL E1 CA C 08 cC ORAB 08 BD C F8CB JSR OLD KEY SUB F7 C BOOO STAB PORTA EL 16 04 0 CMPB A GO BACK TO GET CHAR 26 C 22 0 BNE E2 20 C 29 C BRA El IF A CHARACTER IS NOT A POP OFF THE STACK CHECK MODE LABEL E2 18 c 08 C INY B6 C BOOO LDAA PORTA 18 07 08 16 INY 84 C 08 C ANDA 08 TURN OFF TRANSMIT 26 C 06 C BNE E3 F6 C BOOO LDAB PORTB IF MODE NO GO C4 6 JET iG ANDB F7 TAKE CHAR OFF STACK F7 C B000 STAB PORTB 186 08C INY 31 18 C 08 C INY GO BACK TO GET CHAR 20 C 36 C BRA El IF MODE GO THEN GET CHAR LABEL E3 4F C CLRA STRIP 8TH BIT CA Cy TE Cy ANDB 7F 18 C ED C 00 C STD 0 Y BIC RTS END CODE EEWORD CODE SUB RTII ACK THE INTERRUPT 86 C 40 C LDAA 40 B7 C BO25 STAA B025 ACK INTERRUPT START AD CONVERSION 86 C 10 C LDAA 10 B7 C B030 STAA B030 ADCTL GET BITS FROM HIGH OF PORTE B6 C BOOA LDAA BOOA PORTE 44 C LSRA 44 C LSRA 44 C LSRA 44 C LSRA D 167 D C LDAB D5 INDEX CE C OOCD LDX CD BITQ 3Cr Cy PSHX 3A C ABX STORE SAMPLE INTO THE Q A7 C 00 C STAA 0 X NORMALIZE INDEX 5C C INCB c4 C 03 C ANDB 03 D7 C D5 C STAB D5 INDEX SEE IF WE HAVE A DEBOUNCE 32 38 C PULX A6 C 00 C2. LDAA 0 X Al C 01 C CMPA X 26 C OA C BNE L40 10d AL C 02 C CMPA 2 X 266 0616 BNE L40 06d AL OG 103 04 CMPA 3 X 26 gt O 02 04 BNE L40 02d 97 C D6 C STAA D6 LABLE L40 WRITE BITS FOUND IN D7 B6 C B000 LDAA PORTA 84 C 08 C ANDA 8 9A C D7 C ORAA D7 B7 C B000 STAA B000 DO A D CONVERSION COMPLETE B6 C B030 LDAA B030 84 C 80 C ANDA 80 27 7 C BEQ L40 CE C 00D1 LDX D1 B6 C BO31 LDAA B031 AT C OO C STAA 0 X B6 C B032 LDAA B032 AT Cy Olr C STAA 1 X B6 C B033 LDAA B033 AT C 02 C STAA 2 X B6 C B034 LDAA B034 AT Ce 03 C STAA 3 X 3B C RTI END CODE EEWORD PERE E E al a ee std eat ele ed hat ha CODE EI OE C ChE 39 C RTS END CODE EEWORD 40 B025 00 B024 B026 C 40 B025 40 B024 00 D5 00 D6 00 D7 EI 7 EEWORD LITERAL Cl CLEAR INTERRUPT Cc REMOVE INTERRUPT ENABLE 8A OR B026 C PA3 AS OUTPUT PA7 AS OUTPUT RTII TO 16 38 ct CLEAR INTERRUPT Gt SET interrupt MASK Cc set index to 0 Cc set rcv bits to 0 CI set tx bits to 0 ENGAGE a E E EEE S 8A B026 C 8 B000 C 7E B7E6 EEC RTII B7E7 2 EEMOVE A44A 1FC HERE U FC 4 DUMP 41 B7BE EEC FC AUTOSTART ENA FC B600 4 EEMOVE address to A 33
3. Terminal Mode When you select the File gt Stop Polling menu item MAXDDE switches to the terminal mode of operation MAXDDE is now a power debugging terminal From this mode of operation you can select a node following the EASY A protocol test any node for its presence on the network send and test Max Forth words and source files FTH files Open File File Open File Send File Restart Polling Stop Polling The Open File menu item summons an editor This option is setup in the MAXDDE INI file under the editor keyword It is defaulted to the Windows NOTEPAD program Send File File Open File Send File Restart Polling Stop Polling 13 The Send File menu option lets you select a FTH file and send it to a node on the EASY A network The download is done following the appropriate text transfer protocol Wait for echoed character send the next line upon reception of a linefeed Debug Note It is extremely important to remember that at the time the File gt Stop Polling menu item was selected polling was actively taking place This means that when polling stopped the last node being polled has the terminal s attention You must select the address of the node you wish to be talking to following the EASY A protocol CTRL A followed by the node s address character Copy Buffer MAXDDE Bg He Copy Links Copy Buffer Clear Buffer The Copy Buffer menu item lets you copy the cont
4. the following rules must be followed 1 Always begin the file with a carriage return 2 Always end the file with a carriage return 3 Always leave the BASE in a form that will work properly with the client application s expectations This means leaving the base in DECIMAL if the client application expects to see only decimal numbers 4 The file name must always end in FTH 5 The file name must always be named the same as the Item that it represents If the Item that this file represents is AD_1 then the file must be named AD 1 FTH The file should also contain a word definition called AD 1 but is not necessary if the kernel already supports that name 7 Item Words Item Words are Max Forth words that respond to DDE items They are divided into two types of words itemsReceived that is items that MAXDDE expects a numeric response from and itemsSent or items that MAXDDE expects to Poke or Set to a new value All itemsReceived words must end with a display value response V1 B000 ce Word V_1 will read the contents of address B000 and display the value Because this is an item to be received by MAXDDE MAXDDE expects to receive the following text string vii nnn OK lt cr gt lt lf gt where nnn is a number or some text Remember that Max Forth echoes the characters that it receives while interpreting The response between the word v_1 in our example and the OK can be up to 32 characters in length
5. Buffer K Clear Buffer The Edit gt Copy Links copies all of the links to a Microsoft standard link syntax It follows the Application Topic Item format that works with Microsoft products Application Note You can use this format with EXCEL by simply Pasting the clipboard into EXCEL and prefixing each cell with an equal sign signifying that the cell contains a formula Other client applications could parse this string to get the Application Topic and Item for their own unique syntax 19 Edit gt Copy Buffer MAXDDE Bg Eile ERA Hep Copy Links t Copy Buffer K Clear Buffer Edit gt Copy Buffer copies the contents of the 512 line buffer to the clipboard Edit gt Clear Buffer MAXDDE Bg File BR Hel O O o Copy Links Copy Buffer Clear Buffer Edit gt Clear Buffer clears the 512 line buffer and resets the scroll bars to the bottom of the buffer 20 MAXDDE Help Menu Items Help gt About 5 MAXDDE v Help e The About menu item summons the About dialog box H DDE File Edit Help Microsoft Windows 3 1 MAXDDE 1 1 3 MAXDDE Written by Matthew Mercaldo 1994 1995 386 Enhanced mode Memory 16957 KB Free System Resources 65 The about dialog box tells you some information about your computer s loading at the time you are running MAXDDE Help gt Help On Help Help On Help is a Windows basics help file You can use this to learn more about the Windows ope
6. Client AD 1 AD 2 AD 3 AD 4 Beoor ste rim Bit1 OFF ETE p it2 OFF KEITH Bit4 OFF The Visual Basic program developed lets the user set bits via the Bit 1 Off through Bit 3 Off keys When pressed they say Bit 1 On through Bit 3 On The text to the right of the buttons tells the status of the input bits and the LEDs the left of the buttons turn RED when an input is OFF and GREEN when an input is ON The gauges are Visual basic controls There is a bit map backdrop for the whole form that would have the markings for the gauges given units of measure etc This program can be found as file PROJECT1 MAK You will need the Profession Developer s Version of Visual Basic 3 0 29 Appendix E MAXDDE and EASYA FTH EASYA FTH is a Max Forth file that implements EASY A as well as a small data acquisition package Upon autostart a 16 38 ms interrupt is established that monitors 4 AD channels PE 0 PE 3 debounces 4 bits PE 4 PE 7 and will write 4 bits PA 4 PA 7 with even a small amount of room left over AD_1 FTH through AD_4 FTH read locations in the internal ram at the end of the TIB that the interrupt sources with the AD values The bits are debounced and are also put in a location at the end of the TIB This is done by the file BG FTH BP FTH puts bits found in the high order nibble of the passed value into PORTA Please note that because interrupts are running one can not change the EASYA node address online A disab
7. MAXDDE will get There will exist a word called AD 1 iteml item5 are tags and can be anything followed by These are items that MAXDDE will set There will exist a word called BP AD 1 is scheduled to run every 100 ms AD 1 is to be found on NODEA and NODEB Node values allowed are A to Z and 0 to 9 BP will run every 500 ms BP will be found on NODEA and NODEB Debug lets you see what is happening When the Node initialization files and Item files are being downloaded they will be seen on the screen When items are being polled they will be displayed to the screen This tells the Edit gt Edit Max Forth File menu option what editor to use The COM Port is configured to COM2 Values allowed are Ly Zp037 Or 4 The BAUDRate is configured here Allowed values are 4800 9600 14400 and 19200 25 seconds 10 This is the time when the network sentinal will check if the network is operating properly If it is not it will force a reconfigure Allowed valued are from 1 to 60 26 Appendix B MAXDDE and EXCEL Microsoft Excel MAXDDE XLS ee File Edit View Insert Format Tools Data Window Help zele WE El Arial jo 2 H B 158 598 DE al Jeff MAXDDEINODEBIAD 4 RE es b ee 0 eee EK RE ee ee AXDDE NODEAIAD_1 AXDDE NODEAIAD_2 AXDDEINODEAIAD 3 AXDDE NODEAIAD_4 AXDDE NODEBIAD_1 AXDDE NODEBIAD 2 AXDDE NODEBIAD 3 AXDDE NODEBIAD_ 4 I The Excel spreadshe
8. The response value does not have to be a number as shown in the above V_1 example All itemsSent must expect a value and simply return V2 n B000 C When V_2 is run it will set a number into address B000 Because this is an item to be sent by MAXDDE MAXDDE transmits the following string nnn V_2 lt cr gt where nnn is a number and receives back nnn V 2 OK lt cr gt lt l1f gt MAXDDE uses the correct echoing back of commands and the presence of OK at the end of the received message to validate the packet Items as Defined in MAXDDE INI Each item is further defined in MAXDDE INI Each item must have a keyword section in the file Let us assume the following in MAXDDE INI itemsRecieved item1 AD_1 AD 1 scan 500 node A B An item called AD_1 is defined as an item that receives data from the EASY A network The naming of the keys item1 in our example above is arbitrary It is necessary though that a key be used followed by an sign for proper operation item1 AD 1 AD 1 has its own keyword section called AD 1 Each item will have two entries scan and node The scan entry tells in milliseconds when the item is to be polled In our example every AD_1 on the EASY A network will be polled every 500 milliseconds The scan resolution is 100 milliseconds You must be careful when scheduling these items Assuming 1 millisecond per character at 9600 baud You can run four four letter definitions in the given 100 m
9. and or polling messages If both statements are set to OFF then MAXDDE will startup minimized If either or both are ON MAXDDE will come up windowed Editor The editor section of MAXDDE INI specifies the editor that will be used by the File gt Open File menu item It is defaulted to the notepad program The COM Port The COM port is setup by the COMPort item found in MAXDDE INI If no value is found in the item the COM Port defaults to COM2 Ports are set by the numbers 1 2 30r4 BAUD Rate The baud rate is set in the BAUDRate item Set Speed to one of 4800 9600 14400 or 19200 Baud rate defaults to 9600 if an illegal value is found in MAXDDE INI Network Reconfiguration Time Network reconfiguration time is the time between network health evaluations This value in seconds tells when the network will be evaluate for lost EASY A nodes on the network The default value is 10 seconds for the key ReconfigurationTimel 10 MAXDDE s Modes of Operation MAXDDE supports two modes of operation These are the Polled mode and the Terminal mode of operation When MAXDDE first starts running it will attempt to connect to EASY A based on the MAXDDE INI file s configuration The mode of operation that handles the connecting initializing and polling is the Polled mode of operation When you select the File gt Stop Polling menu item MAXDDE switches to its Terminal mode of operation From this mode of operation you can interactively
10. type to any node on the network as well as download source files to any node for testing Polled Mode The Polling mode is made up of three main states I Node Initializations I Item Initializations Q Polling When MAXDDE first enters the Polled mode of operation it attempts to connect to the configured COM port If MAXDDE cannot connect to the COM port then you will see a dialog box describing the situation MAXDDE will continue to attempt to connect to the port Debug Note Ifthe COM port is incorrectly configured then you must set the correct value in MAXDDE INI and restart MAXDDE Node Initialization MAXDDE will attempt to download the first item s item file in its items list If upon inspection of its database MAXDDE sees that the Node supporting that item is not initialized it will attempt to send the node s Node initialization file This file will be named NODEx FTH where x is a letter between A and Z or between 0 and 9 If it cannot find that file MAXDDE will let you know that the file cannot be found 11 Debug Note Even if the contents of the file is a few Carriage returns there MUST be a node initialization file for the node Item Initialization Once the node file has been set and the database updated the item files are downloaded to their respective initialized nodes These files are named as described above in the section named Item Initialization Files Debug Note Even if the contents of th
11. Edit Menu ensuaussusessadnausrersenueaeetevenkerajit 19 Fr Copy Ink S iraisesieini Tinin enaA TA LATAE 19 EGBG ONO Biller Lorries eitie cd Eni EAEE EEEE 20 Edit gt Clear Buffer eee Mn Oey ere ee tie SOR Pe A SORRY eT Er tr Or er 20 MAXDDE Help Menu Items reorvonnnrnornonnnrnvnnennnrnrnnnnnnrnnnnnnnnrnnnnnnnnverevnnnnsesennne 21 Eee 21 Help gt Help On Help ey eT oe ane ny en ne rr rn eer 21 Ber Heparin ey Ae iene eT rey Ae vee Teer IAT 21 Trouble OO GIN tnt a dasa ninina Cala ade te Cs Gade is Eile GENESE 23 Is the Network and wiring Correct orrrrnnnnrnnnnnnnnrrrrrrrnnrnnnnnnnnerrrsssrnns 23 Is the MAXDDE INI file Properly Configured rrrrrnnnnnnnnnnnnnrrrrrrrnnn 23 Is the PC Hardware Properly Configured rrrrnrrnrnnnnnnnnnnnnerrrrrrrnns 23 MAXDDE and Sample Applications cccccescccccceeseececeeeeeeecceuesecceeeeeseeseees 24 Appendix A MAXDDELINI errrrrnnnnnnnrrrrrnnrrrnnnrnnnnnnrrvvnnnrsnssrnnnnnnrrrnnnsssssssnnnnnnns 25 Appendix B MAXDDE and EXCEL vcssssss cass ccascusessaseatessaccataccssensatassendeseasentaets 27 Appendix C MAXDDE and Quattro eerrrrrrrrrrrrnrnnnnnnnnrrrrrrrnnrnnnnnnnnerrrrrnnnennns 28 Appendix D MAXDDE and Visual Basic rrooorrrroorrrrorrrrrrrrrnrnnnnnnrrrrrrrrnnnnnnnnn 29 Appendix E MAXDDE and EASYA FTH errnnnnenrnnnnnnnnrrrrrrrnnnnnnnnnnnrnrrrrnnnnnnnnnn 30 Appendix F EASYA FTH ea A O E A 31 Quick Start Requirements This section assumes that you have a worki
12. MAXDDE User Manual for Version 1 1 New Micros Inc 1601 Chalk Hill Road Dallas Texas Written by Matthew Mercaldo 41 South Park Street Oconomowoc Wisconsin Liscense Agreement Limits of Liability Whereas Matthew Mercaldo and New Micros Inc have to best of their ability tested MAXDDE and this document Matthew Mercaldo and New Micros Inc make no warranty of any kind expressed or implied with regaurds to the contents of this manual on MAXDDE and its use Trademarks EXCEL Visual Basic and Windows are all trademarks of Microsoft Corporation Quattro Pro is a trademark of Borland International Table of Contents Tableof AS TR TAU eo ddd ddd ahd Seaplane ib eed vn ed pid edNin ld on en daha ad Sadat 3 OTER Seerne ca le anes hale tn be se seters bt cg toe 5 Regue ments oaeoi tii aii Otel ERER EEA EREA itu 5 Quick nstallati heseisereinitieneresieistiaien aeea EE ERA 5 MAXDDE An OvervieW sssssssssserresessssssrrrrrossssssssrrrrrreressssserrerresssssssetrreresss 6 The DDE of MAXDDE 5 ce secssptcnnsutsnaetoccspionnsvtone totctiteantVante twevenroantWentetwoess 6 Jui W294 81D Ro a SA Puente OT eT 7 Node Initialization Files eicicccticcsstestneceveatcnveentunesovtedncrtveabinnteules duende 7 Item Initialization Flessyasnegremmmmeiueminriveiibnsatrinnie 7 Item Words ai remire Ses aeaa AE aa ple ops EE eee bekle peke 8 Items as Defined in MAXDDELINI L eeeevorrrnnrnrrnnrrrrnnrnnrrrnnnrnnrrrnnnvnnsrrnnnner 9 Debuggi
13. e file are a few Carriage returns there MUST be an item initialization file for the corresponding item Polling Once the initialization files are sent MAXDDE starts to poll items based on the MAXDDE INI file s configuration Poll scheduling happens every 100 milliseconds Every 100 milliseconds MAXDDE first checks to see that a scheduling overrun has not happened This overrun is seen as an item taking more than 1 second to complete its task response If an overrun is detected then MAXDDE sets the active node associated with the stuck item s status to NOT BOOTED then sets all items associated with that node to NOT BOOTED then leaves the scheduling mechanism If there are no overruns All items are evaluated for polling and scheduled then the polling chain is started All items scheduled for polling are polled This includes any items that are going to send commands or values from DDE POKE commands to a node Reconfiguration Periodically based on the value set in MAXDDE INI for the ReconfigureTimel entry the database is evaluated for nodes that are not Initialized These are nodes that come up as NOT BOOTED If any are found the timer system that monitors and controls scheduling is temporarily shut down The COM port is reset and an attempt is made to reboot the downed nodes 12 While MAXDDE is polling you cannot download a file with the File gt Send File menu item While MAXDDE is polling typing of characters is ignored
14. ents of the screen buffer to the clipboard for future pastes into an editor or other application Application Note You can quickly copy the buffer to a file following this sequence of commands Q Select Edit gt Copy Buffer Select File gt Open File Select any text editable file to get into the editor From the editor select File gt New to get a new file opened From the editor select the Edit gt Paste menu item to Paste the contents of the clipboard into the file 14 E From the editor select the File gt SaveAs menu item to save the buffer to a file I Exit the editor to return to MAXDDE Clear Buffer MAXDDE Bg File EXE Help o Copy Links Copy Buffer Clear Buffer The Clear Buffer menu item simply erases the contents of the Buffer DDE Link Status Messages If DDE links are active for items the following messages can be sent as status messages The DDE client application should be aware of these messages and trap for them when necessary Stopped The user has selected the File gt Stop Polling menu item BOOTING The item is in the node item initialization process The item was lost while polling 15 MAXDDE File Menu Items File gt Open File MAXDDE v mcm Edit Help o OO Open File l SendFile File Restart A Km Polling H J Ext O This command summons the editor You will be given the opportunity to chose a FTH file first Choice is manifest by the Com
15. et option is useful for monitoring An Excel macro language programmer can add data acquisition capability mathematical analysis capability DDE Poke capability as well as file I O capability Please note that the picture above displays the formulas in the cells The cells would have numbers displayed or a message stating the condition of the link This formulas are displayed in the cells for clarity of the formulas This example can be opened from EXCEL as MAXDDE XLS found in the MAXDDE directory 27 Appendix C MAXDDE and Quattro Quattro Pro for Windows MAXDDE WB 1 Tools Graph Property Window Help INITIATE MAXDDE NODEA CHANNEL REQUEST CHANNEL AD 1 VALUET REQUEST CHANNEL AD 2 VALUE I REQUEST CHANNEL AD_3 VALUES REQUEST CHANNEL AD_4 VALUE4 TERMINATE CHANNEL Quattro communicates to MAXDDE by using its macro commands on a workbook As seen above cell B1 initiates or opens a link with MAXDDE and writes the channel number to cell Al which has been named CHANNEL It then does a DDE request of the data This implements a cold link or polled link When the data has been retrieved the channel is terminated in cell B6 A Quattro macro programmer can write programs that poll for data as well as poke data This can be incorporated into a data acquisition program that does application specific work MAXDDE WBI1 can be found in the MAXDDE directory 28 Appendix D MAXDDE and Visual Basic MAXDDE Visual Basic
16. illisecond time frame before overruns begin to occur It is important to keep the words as short as possible for timing considerations Since MAXDDE currently operates at 9600 baud each character takes about 1 millisecond to transmit Each character is echoed taking another millisecond So really each character takes 2 milliseconds With a 4 letter definition we can assume about 8 milliseconds to transmit and receive For each word an OK a Carriage Return and a linefeed will come across the wire so we are up to 12 milliseconds per word For each word we will assume that it returns a three digit number Each number is preceded by a space and followed by a space This totals up to 17 milliseconds per word Assuming a worst case of 5 milliseconds for Max Forth to think about what it has to do and MAXDDE to send and receive the packet we can assume 22 milliseconds per word That is about 88 milliseconds for 4 words Windows also takes some short time to respond to events so this can throw some more time into the formula All in all running on a 486SX PC Over extended periods of time Four four letter definitions run properly The node entry tells MAXDDE which nodes this item belongs to In our example NODEA and NODEB will be maintained with AD 1 The node list is a comma delineated list of nodes in the set of upper case alphabetical characters A Z Debugging information The two debugging statements tell MAXDDE to display file downloads
17. le interrupt word needs to be sent to the node and executed Unless one is in Max Forth before changing the address CODE SUB DI OF C SEI to disable interrupts 39 C RTS to exit the routine END CODE Please look over EASYA FTH AD_1 FTH AD_2 FTH AD_3 FTH AD_4 FTH BP FTH as well as BG FTH as a model for writing MAXDDE aware words All of these files can be found in the MAXDDE directory 30 Appendix F EASYA FTH Caution This program should only be loaded into a MAXFORTH V3 5E F68HC11 component Loading this program into other NewMicros based products will result in improper operation This program can be loaded into the chip using the Edit gt Download Max Forth File menu option Local to the MAXDDE directory you will find EASYA FTH After downloading the file set the new address as appropriate To set the address to a new address first Disable Interrupts See Appendix E above then set the address to B7BE Remembering that A is 41 hex and Z is 5A hex type the following for address A 41 B7BE EEC The following is a listing of EASYA FTH COLD GET ADDRESS HEX BD C F8CB JSR OLD KEY SUB TAKE CHAR OFF STACK CODE SUB A C 18 C 08 C INY Fl C BBE CMPB B7BE 18 C 08 C INY 39 C RTS BD C A C CHECK ADDRESS END CODE IF NOT MY ADDRESS EEWORD GO BACK TO GET CHAR 26 C 1F C BNE El CODE SUB N I IF THIS IS MY ADDRESS TURN ON TRANSMITTER
18. lication talks DDE somewhere it will let you set the Application name the Topic name and the Item name It is just a matter of finding out where that is in the context of the client Application MAXDDE on startup Upon powerup or reconfiguration MAXDDE will send each node a Node initialization file as well as Item initialization files These files are downloaded and either reset the node or program the node s available internal RAM with Item words These Max Forth words respond to MAXDDE s subsequent requests and commands Node Initialization Files These are files that setup the nodes to receive the Item Words They typically include the word COLD to reset the Max Forth internal dictionary pointer The initialization files must follow the following rules 1 Always begin the file with a carriage return 2 Always end the file with a carriage return 3 The file name must always end in FTH 4 The file name must always be the same as the Topic name that it represents Nodes are represented by the Topic name There must exist a file with the node name For example if you wish to use node A on the EASY A network then there must exist the file NODEA FTH in the directory local to MAXDDE Item Initialization Files Item initialization files are simple Max Forth source files By following a few simple rules the files will work properly Of course the words to be sent to the system must be tested first but assuming working definitions
19. mon File select dialog box Name Directories er gt maxdde 9 callback 9 diski 9 phasel List Files of Type Drives MasFor Fies 8 The editor can be set from the MAXDDE INI file found in the Windows root directory The editor section is defaulted to the Notepad application 16 File gt Send File File Open File C Send File Restart Polling Stop Polling File gt Send File lets you select a Max Forth source file and download it to the EASY A node in focus Remember to set an EASY A node into focus before using this option File downloading is stopped by the File gt Stop Polling menu item File gt Restart Polling File Open File Send File Restart Polling Stop Polling The File gt Restart Polling menu item is only active while MAXDDE is in terminal mode When selected it switches MAXDDE back to Polled mode All initialization files are downloaded and polling commences File gt Stop Polling 17 MAXDDE a a Edit Help Open File Send File Restart Polling Stop Polling The File gt Stop Polling menu item stops polling and switches MAXDDE to its terminal mode of operation File gt Exit MAXDDE a Edit Help o Open File Send File Restart Polling Stop Polling Exit The File gt Exit menu item lets you exit MAXDDE 18 MAXDDE Edit Menu Items Edit gt Copy Links MAXDDE Hg File BUE Help o Copy Links t 5 K Copy
20. n specific capabilities The DDE of MAXDDE The Dynamic Data Exchange DDE is a mechanism that the Windows operating system uses to allow Windows applications to communicate with each other Data to be passed between applications is identified by a three tiered name The Application name is the first tier the Topic name is the second tier and the Item name is the third tier All DDE capable applications let users link to server applications by this addressing scheme MAXDDE is a DDE Server it is the server for information that can be gotten from the configured EASY A Max Forth network Applications such as Microsoft EXCEL and Quattro Pro can be configured as DDE clients Microsoft Visual Basic programs can be written quickly to provide a Man Machine interface to the application The information passed between applications will be of a specific type MAXDDE will work with the TEXT type of information Some DDE clients make linking easy while others make it a little harder In EXCEL a simple formula in a cell is all that is required to connect to MAXDDE This formula follows the syntax Application name Topic name Item name Quattro Pro requires the use of its macro language to connect properly Other applications just ask for the Application Topic Item triad and are straightforward to use through a system of questions asked from dialog boxes When configuring a client application to talk with MAXDDE you can be assured that if the app
21. ng information yoga sacaltad naienta anes ubndncatnieabncs ues bnecdvtohnentolisbuewestabnrnds 10 EE OE EN NE ota bode 10 TRE COM PGS a tie prcg tance tae So eg Sst ei eae tases eee eplet 10 BU TSE AE Parcs pod Ocal ds esd REESE EN od de Oe 10 Network Reconfiguration Time rrrrrrrrnnnnnnnnnnnnnnnnnrnnrsrrnnnnnnnnnnnenersssnnns 10 MAXDDE s Modes of Operation ccceeccccccesseccceceeeeececeeeecceeseuecsseeueeeeseees 11 Polled Mode a5 sca assiaticate sce saucy bane apne die seilene eee stalin lekse b e 11 Node Treb t one pesorretrostaeetmeetiantieeG imot 11 Item Initialization inniti aaea 12 Polli NE eono EEEE AEE GE 12 Reconfiguration ssssssssseereesssssssssetrrreresssssserrrerssssssretrereesssssseerere 12 Terminal Mode teiripeoir eT REEE ey re een mn er mee EOR E 13 Open FIG 34 sateatnataleitnetediet acum TE A AAE A ANA e a 13 Send FE E E E E E wy wry Re were 13 Copy Piller gogo secede 2s seisein Stk wee hale ose beh ARAK IERRA tank es task set 14 Clear Bilk hewitt starting died dS Dada ge Uc cde Oo a dle aaa 15 DDE Link Status Messages asc sccsaxcsancetseadncnduesducstatadntadees dues tonadacxteeadouds 15 MAXDDE File Menu Items orrornonnornornonnnrnrnnnnnnrnrnnnnnnrnnnnnnnnrnnnnnnnnnernnnnnnsenennne 16 Fe Open File amet 16 See Send NR SE ER EN ORNs E Otis 17 File S gt Rest rt Polling vvunsasknseeneskeepkseoskumerleta se is 17 Fe Stop Polli fe assess asc esata Caste Vn ad anew ako did kod tiga 18 Flen 18 MAXDDE
22. ng knowledge of DDE applications the EASY A protocol and have a network up and running with the appropriate support words and Item words tested and running You will need to setup the MAXDDE INI file as described in section named MAXDDE INI It is important that the INI file is setup correctly or the EASY A network definition will be incorrect resulting in network reconfigurations Quick Installation Insert the disk into the appropriate 3 1 2 floppy drive A or B From the Windows File Manager s File menu item choose Run At the Command Line prompt type A setup if A is the source drive OR Bi setup if B is the source drive Respond to the questions as appropriate to your system or preference Once MAXDDE is installed you will need to set the COM port properly The default setting is COM2 as set in MAXDDE INI If you need to change this then edit MAXDDE INL the COMPort key item Values allowed are 1 2 3 or 4 You can also set the baud rate by using the BAUDRate key item Values allowed are 4800 9600 14400 or 19200 If you run into problems use the Trouble Shooting section of this manual to help resolve the problems OR read on MAXDDE An Overview MAXDDE provides a way for DDE capable Windows applications to interact with an EASY A network of Max Forth nodes EASY A is a simple network protocol that can be programmed into the EEPROM of a Max Forth capable 68HC11 Along with EASY A the node can be programmed with other applicatio
23. rating system Help gt Help 21 Unfortunately MAXDDE 1 1 3 does not have a help system fully installed Engineers are working around the clock to create the help files 22 Trouble Shooting You are here because it didn t work We must first determine what went wrong Is the Network and wiring Correct The first thing to check is if the EASY A network of nodes is running properly This can be done by using the Terminal capabilities of MAXDDE With the proper COM port setup Select the Stop item in MAXDDE s File menu This turns MAXDDE into a terminal program Try to access all of the nodes on your EASY A network To access a node on the EASY A first type CTRL A followed by the node address a character in the set of uppercase letters A Z If you do not get a response back then we know that something is wrong on either the RS 422 converter or the network nodes themselves If something is wrong with your EASY A network it is beyond the scope of this help guide due to the applications specific nature of your network Are you sure that the nodes have power You can test the converter and or its wiring by simply looping it back Looping back simply means connecting the transmit lines to the receive lines TX to RX and TX to RX If you do not see the characters you have typed echoed back then something is wrong with your wiring and you need to re examine it for errors Is the MAXDDE INI file Properly Configured If the ne
24. s is all done without a line of code Each object such as a textbox has a property list text box properties include ddelink attributes that are simply filled in at creation time OR can be modified at run time Visual basic lets the developer quickly turn rapid prototypes into standalone applications in a simple one step operation I think with the correct group of gadgets histogram speedometer and other like objects one could develop screenware comparable to Wonderware See the Application note called Visual Basic Application Note 1 If you have Visual Basic 3 0 loaded you can load PROJECT1 MAK To restate Microsoft recommends keeping to a Text format to exchange information over DDE Microsoft products keep to this Other products Quattro will but through coercion 24 Appendix A MAXDDE INI What MAXDDE knows about the content of the EASY A network that it is supposed to be connected to is found in the MAXDDE INI file that is found the Windows directory This file is loaded at startup time This is an example of a MAXDDE INI file itemsReceived iteml AD 1 item2 AD 2 item3 AD 3 item4 AD 4 itemsSent item5 BP AD 1 scan 100 node A B AD 2 scan 500 node A B AD 3 scan 500 node A B AD 4 scan 500 node A B BP scan 500 node A B debug SHOWFILES OFF editor editor NOTEPAD COMPort Port 2 BAUDRate Speed 9600 ReconfigureTime These are items that
25. twork appears to be OK then check to see that the MAXDDE INI file found in the Windows directory is configured properly All items should have an associated FTH file in the MAXDDE directory There should also be a node initialization file in the MAXDDE directory MAXDDE will try to send these files to the appropriate nodes on the network See the manual on this topic under the MAXDDE Overview section Is the PC Hardware Properly Configured If you PC locks up upon entering MAXDDE you could have a conflict between a motherboard based serial port and an installed card serial port It is possible to configure the local serial port as inactive with active interrupts If you are using the card based serial port then the local port must be completely disabled 23 MAXDDE and Sample Applications All of the sample programs require at least one EASY A node with EASY A FTH resident in EEPROM at address A EXCEL can connect quickly and easily to MAXDDE The sample code MAXDDE XLS is a simple EXCEL monitoring program EXCEL can be used as a MAN MACHINE interface through its macro language See MAXDDE XLS for a simple EXCEL monitoring example Quattro didn t really work the way the standard says it should The way to access DDE in Quattro is through the macro language See the sample code called MAXDDE WB1 Visual Basic is the Volkswagen of PC languages To do DDE the trick is to create a text box on a form then connect that textbox with DDE Thi
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