Mitsubishi Electric melsec q00ujcpu User Manual page 277

Programmable controller
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(c) Communication error
If any of the following status is met, responses are not returned and therefore communication cannot be made.
Review the transmission frame.
1) The serial communication function is set not to be used.
2) Communication is made at different transmission speed and data format.
3) A frame to be sent has no correct starting end or terminal.
• 3C frame format 4: ENQ/CR + LF
• 4C frame format 4: ENQ/CR + LF
• 4C frame format 5
4) The frame identification number of a frame to be sent is incorrect.
5) The number of transmission bytes is under the header part size.
6 - 126
*1
: DLE+STX/DLE + ETX
*1: When "Sumcheck enable" is set, the sumcheck code is included.

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