FX5U built in RS485 data received unstable

[johnsonpay 0]

Hi all, 

May I know why I using FX5U built in RS485 received other device data, the data unstable, always jumping, just received only no need sent out any data.(protocol type is non-protocol)

I use PC to monitor received the data, e.g first byte is 0A, my PLC received 1000, sometimes jump to 500, I don't know why, but I use FX3U all is ok, very stable, anybody have facing this issue before ??

Then always have error light lit up, I use PC to diagnose the alarm message is framing error, parity error, I have change to different parity but still same, the third party device default parameter is 8bit data, 1 stop bit, even parity, 19200 baud rate.

Edited 6 Nov 2018 by johnsonpay

[kaare_t 155]

Sounds like noise problem, given that you are 100% sure that the bit-settings (databit/stopbit/parity) is correct. Try as a test to lower the transmission speed. I'm not aware of any issues with the FX5 and would guess a cable or setting issue... What is your peripheral device communicating with the FX5?

[Bryll 31]

Maybe a stupid question, but did you terminate the wire at both ends ?