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"c" programmable communications interface for controllogix

powerful platform for developing and running "c" applications on allen-bradley"s controllogix processors. the mvi56-adm module is a single slot, backplane compatible solution for the allen-bradley controllogix platform. this module is a powerful and programmable solution supporting two fully isolated serial ports allowing the many serial field devices to be integrated into the controllogix platform.

the mvi56-adm module has three serial ports, two of which are isolated for field interfaces:

• cfg -- debug/configuration rs-232
• prt1 -- application rs-232, rs-422 or rs-485
• prt2 -- application rs-232, rs-422 or rs-485

prt1 and prt2 are jumper configured for direct or multi-dr-op field communication. the application program can be written to control the two application ports independently, allowing maximum flexibility in the design.

the mvi56-adm module is the ideal solution for many applications where serial connectivity needs to be added to a controllogix platform. example applications involving the mvi56-adm module include:

• bar code scanner interface
• legacy ascii protocol connections
• terminal port emulation
• printer driver (alarm/status printer)
• customized protocol implementations

serial port api functions

the serial port api provides a common interface to the serial ports across all of the mvi hardware platforms.

• initialization - open and close serial port
• configuration - configure serial port parameters
• port status - control and monitor serial port control lines
• communications - send and receive data through serial port
• miscellaneous - get the serial api version information

backplane api functions

function category

• initialization - open and close backplane
• configuration - read and write the io configuration of the module
• direct io access - read and write data using the io image
• messaging - sendand receive data using messaging
• synchronization - wait for output data up-date
• miscellaneous - control the console and leds

adm api functions

• initialization - open and close api
• debug port - debug port user interface
• database - read and write data to database
• timer - start and check timers
• backplane - transfer data over the backplane
• led - set user led indicators
• flash - parse configuration files
• miscellaneous - configure the console

debug/configuration port (cfg)

• communication parameters
• 110 to 115,200 baud
• 8-bits, no parity, 1 stop (fixed)
• configuration of module
• communication and backplane transfer stats
• protocol data monitor
• internal database viewer
• user defined menu

application ports (prt1 & prt2)

• full hardware handshaking control, providing radio, modem and multi-dr-op support

• software configurable communication parameters

  - baud rate: 110 to 115,200 baud

  - parity: none, odd or even

  - data bits: 5, 6, 7, or 8

  - stop bits: 1 or 2

  - rts on/off delay: 0 to 65535 ms

general specifications - development environment

• operating system: general software dos 6-xl

• compatible compilers (16-bit dos target)

  - digital mars c++ 8.49

  - borland c++ v5.02

• application programming interaces (api)
• serial port api: serial port functions
• backplane api: low level backplane functions
• adm api debug port functions: debug port functions, database functions timer functions, high level backplane transfer functions, led functions, flash read functions

• example application program

  - debug port menus

  - backplane data transfer

  - module status

  - sample communication driver

  - user defined menu

• flash disk tools

  - winimage - windows disk image builder

  - mvi flash up-date - rom disk image download

  - mviupdat - rom disk image download (dos)

• development steps

  - write application code using api functions

  - build dos executable linking in api libraries

  - cr-eate rom disk image

  - download image to module

• form factor:- single slot - 1756 chassis compatible- local or remote rack
• backplane current load: 800 ma @ 5 v
• operating temperature: 0 to 60 deg c (32 to 140 deg f)
• storage temperature: -40 to 85 deg c (-40 to 185 deg f)
• shock:- 30g operational- 50g non-operational
• vibration: 5 g from 10 - 150 hz
• relative humidity: 5-95% (w/o condensation)
• led indicators:- module status- backplane transfer status- application status- serial activity and error led status
• configuration serial port (prt1):- db-9m pc compatible- rs-232 only- hardware handshaking

• application serial ports (prt1, prt2)- application port to db-9m pc compatible connector is supplied- rs232/422/485 jumper se-lectable- rs232 handshaking configurable- 500v optical isolation from backplane