RS232 Modbus Multiplexer

J

Thread Starter

Jerry Alexander

Looking for a multi-master Modbus RS232 multiplexer. An HMI and a PLC or two PLC masters talking through a modem to multiple Modbus RTUs.

We have tried Calta but had difficulty with it when working with Verizon and ATT phone lines. The individual lines work fine without the mux. The Calta unit works fine with dedicated District owned lines.

Thanks,
Jerry
 
J

Jerry Miille

You might look at our Multii-Port module
http://www.miille.com/din366-10p.pdf

It allows multiple Modbus Masters to communicate with one or more Modbus Slaves. The serial data settings can be different on each communication port (baud rate, RTS On and OFF delays, etc.). If you have questions you can contact me off list at jmiille at miille dot com.

Jerry Miille
 
Hi Jerry,

From FieldServer the FS-B3510 has 2 x RS-232 & 2 x RS-485, the FS-B4010 has 8 x RS-232 & 2 x RS-485 each port can be individually set up for baud rate & master/slave.

Thanks,

Richard
 
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