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Thanks  Mr. Sparky,

Actually I have set the same bits/parity/stop bits of receiver as same the sender already, as attached below, 

QJ71C24N-R2-Setting.jpg.67e2177e13dae414

And also sender setting as attached below,6311fa14f3dd3_SerialPortSetting.thumb.jp

 

From the circuit trace data shown the framing error on space bar between ASCII Texts

6311fab18bb7c_CircuitTraceData.thumb.jpg

Text File Data 

6311fac860437_TextData.thumb.jpg.b513f4f

PLC Status shown the error code 7F68.

ErrorCode7F68.jpg.0c7b6e3327410649901038

Trouble shooting is

Error7F68.thumb.jpg.aa211da55dfa0668d7c1

I don't know how to solve this issue, we also tried by BAR code scanner every thing fine no error coming.

I amnot sure the space bar between string (ASCII TEXT ) will be the root cause of this error. Is possible PLC don't know space in between letters?

Please advise, Thanks you

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