Internet PLC Forum

General => Technical support => Topic started by: Gerhard on September 01, 2003, 02:51:03 PM

Title: Communications problem
Post by: Gerhard on September 01, 2003, 02:51:03 PM

We are trying to connect to COMM2 of a T100MX3224 PLC.
We cannot cummunicate through this port in any way.
We heve even been unsuccessfull to load the program through this port.

We can use COMM1 and the RS485 port.
The firmware is R36

Do you have any suggestions?

Title: Re: Communications problem
Post by: support on September 01, 2003, 09:08:05 PM

The COMM2 port on T100MX PLC does not support hostlink commands or MODBUS commands,  so you can't
use it for on-line monitoring etc. Only COMM1 and COMM3 can respond to host link or modbus commands. This is clearly mentioned in the PLC's installation guide.

COMM2 is mainly for use by TBASIC commands such as INPUT$, INCOMM, PRINT #, OUTCOMM and NETCMD$. It supports only up to 19,200 bps baud rate and the only format supported is 8 data bit, 1 stop bit and no parity.