Hostlink serial CJ1W-PTS16 port CJ1W-PTS16 test software to send command frame: @00WD0001ABCD56*CR, test write "ABCD", "ABCE", "ABCF" can be written to PLC. But unable to write "ABCG" and "ABCF", in response to the frame @00WD1557*, what happened to FCS, I checked there is no mistake, hope you generous with your criticism!