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T J SHARON

OMRON SCU32-SCU32 - Serial port communication fluctuation

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HI All, 

I have an issue with my SCU32 communication.

 Back ground

Two SCU32s  (top and bottom side) connected via a 1100M datacable  using port1 ( 9600bps,  8-2-E, start code FF, end code FE, Tx save to d1000-d1200 , Rx save to d2000-d2200). PORT2 of bottom SCU32 is connected to a compass( 2 wire, 8-1-N, 19200 bps, serial gateway MODBUS ). Refer to photo

Issue 
Without compass, the receiving data at top is very stable and is didn't see any fluctuation. But if is compass is connected at bottom side port2, there is a fluctuation at the top side RX data(specifically d2000-d2005 ) .  I checked the data a bottom side TX (d1000-d1200) and it is stable. Only after sending the data and Receiving at Top side, then only the starting words fluctuate.

I am not sure sure what is wrong, I am using logical ports for the DTXDU/DRXDU and compass.

 

Appreciate all your feedback and suggestions.

 

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HI all, 

 

Any suggestion or comments?

 

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