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I have an application that has a Modbus RTU pendant acting as a master and 2 Modbus TCP slaves. It appears that some of the gateways only support TCP Master and serial Slaves. I found 3 that support an RTU master:

1. Square D. "174 CEV 300 20" $1027
2. Moxa MGate MB3180 $????
3. Perle DS1/TS2 $160
4. Your recommendation please $????

The Perle device is much cheaper but does it work and is it robust enough for the factory floor?

Thanks for your advice,

Mark

Search Lantronix for UDS1100-IAP & XPRESS-DR-IAP, they are reliable serial servers that you can use as a com port replicator (included driver) or convert into protocols converter, including Modbus. When you use with a serial master device, you specify TCPIP destinations list that math modbus adresses asked by master. Serial side is fully configurable; RTU or ASCII, 232, 422, 485, baud, parity, etc...

Be sure to choose IAP versions, that are upgradable with provided protocol converter firmware.

Our company makes a gateway called the ETH-200 that has 1 Ethernet port (supporting Modbus TCP slave), 2 RS485 ports and 1 RS232 port. The RS485 and RS232 ports can be configured to be either Modbus RTU master or slave. All ports can be simultaneously active.

http://www.iccdesigns.com

Price is $395.00 @ qty. 1.

Regards,
Darrin Hansen
ICC, Inc.

Mark,

I would love to help you out with your application. The Moxa device called the MGate MB3180 will work great with your application and is extremely easy to set up. Please contact me at 1-888-Moxa911. We would be happy to provide you an evaluation unit.

Best Regards,

Jim Toepper
Product Manager Moxa Technologies

Kalkitech Gateways are ideal for supporting Single RTU Serial Master and 2 TCP Slave connections.

Check out http://www.kalkitech.com/protocolgateways.htm

Sincerely
Pras anth Gopalakrishnan
prasanth@kalkitech.com
www.kalkitech.com