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AsComm manual MODBUS Driver with AsComm Program

©ASKOM, Gliwice October 2007 15

5. Interoperability of MODBUS Driver with

AsComm Program

The MODBUS driver ver. 1.9.1 or higher is designed for the interoperability with AsComm

program.

The MODBUS driver parameterization is described in the documentation of the asix system

drivers: CommunicationDrivers.hlp.

If the channel declaration is as follows:

Channel name: logical_name

Channel driver: Modbus

Device identifier: 4

Port: COM3

the name of client will be ‘MODBUS:3’

To establish the communication with AsComm it is important to set up the Switched line

parameter:

Architect > Fields and Computers > Current data module > declared channel parameters >

AsComm server client tab

If the modem is connected to an other port than COMn, then you should give the number of

this port by means of the parameter Define modem by port > port or specify the modem

name by means of the parameter Define modem by name. You should also give a telephone

number and define other parameters required. If MODBUS driver has to communicate with

many controllers by means of the same modem, then one should define suitable number of

channels assuming the parameter port as a virtual transmission channel and specify for each

channel an appropriate telephone number.

EXAMPLE

Channel declarations:

Name: Chan1

Driver: MODBUS

Device identifier: 1

Port: COM11

Transmission speed in bauds: 9600

Number of bits In a character: 8

Parity checking: none

Number of stop bits: 1

Maximal number of inputs/outputs: 16

Maximal number o registers: 16

Declaration of ‘Chan1’ as AsComm server client:

Switched line / Use a modem for connection initialization – the parameter set up

Define modem by name: US Robotics

Phone number: 11111111

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