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During communicating TesysU with Lulc033 (modbus RTU communication cassette) with Vijeo Citect SCADA using EGX300 (Modbus to ethernet gateway) we are getting "#com","#bad". How to resolve this.

You need to consider these following points during this communication :

1. Check that the communication parameters are configured properly in the TesysU like baud rate , parity , stop bit same as you have configured in the EGX300 and in SCADA Ports configuration.

2. In Vijeo Citect the following INI parameters are configured properly :

>> [Modnet]InitVar = 40705
>> [Modnet]InitVarType = 3
>> [Modnet]Timeout = 20000

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