Mitsubishi Electric Q01UCPU User Manual page 237

(4) Setting transmission specifications
Set a transmission speed, sum check status, transmission wait time, and online change status for this function in
the Serial Communication tab of the PLC parameter dialog box. (
• Select "Use Serial Communication" to communicate with a personal computer or HMI from other companies
using this function.
• Set a transmission speed, sum check status, transmission wait time, and online change status.
Click here to use the serial
communication function.
Set Transmission speed, Sum
check, Transmission wait time,
and Run write setting.
(5) Precautions
(a) Switching a connection from an HMI from other companies to a programming tool
A connection device can be switched from a personal computer or HMI from other companies to a
programming tool during communication. However, this operation causes a communication error in the
personal computer or HMI. For a startup method of the personal computer or HMI after it is reconnected to the
CPU module, refer to the manual for the device used.
(b) Transmission speed set in the Transfer Setup screen
When "Use Serial Communication" is selected, the transmission speed set in the Transfer setup screen of the
programming tool is ignored.
(c) Communication error
If any of the following conditions is met, no response is returned (a communication error occurs). Take a
corrective action.
• The serial communication function is set not to be used.
• Communication is made at different transmission speed and data format.
• 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
*1 When the "Sum Check" checkbox is selected, the sumcheck code is included.
•
The frame identification number of a frame to be sent is incorrect.
•
The number of transmission bytes is under the header part size.
*1
: DLE+STX/DLE + ETX
CHAPTER 3 FUNCTIONS
Page 452, Appendix 1.2.12)
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