ZyXEL Communications Omni 288S Manual do Utilizador descarregar pdf (Página 16)

MODBUS Driver and AsComm Program AsComm manual

16 October 2007 ©ASKOM, Gliwice

Name: Chan2

Driver: MODBUS

Device identifier: 1

Port: COM12

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 ‘Chan2’ as AsComm server client:

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

Define modem by name: US Robotics

Phone number: 22222222

In the example above Chan1 will communicate with a controller placed under the telephone

number 11111111, and the Chan2 with a controller placed under the telephone number

22222222. The US Robotics modem will be used. The Define modem by name parameter

may be replaced by the parameter Define modem by port, which specifies the number of the

serial port to which the modem is connected.

You should notice that the above description of using of the MODBUS driver on switched

lines does not include any modem parameterization. The modem parameterization depends

on type of used modems. During tests a modem „Zyxel OMNI 288S” (on the slave side) and

a modem „Pentagram Shadow 56K” on the asix system side were used. The following

parameterization of modems was performed:

• the modem on the slave side was set in the mode „Auto answer” and respond to a

remote call after having received one ring signal;

• the modem on the slave side was set so that the transmission between the modem

and the slave may always be performed at speed of 9600 bps;

• the modem on the slave side was set so that the modulation V32 9600 may always be

used;

• the maximum transmission speed between the asix system and the modem was

limited to 9600 bps (modem settings in Windows system);

• on the asix system side the hardware compression was switched off (modem settings

in Windows system);

• transmission parameters of the MODBUS driver were set to 9600,8,none,1.

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