Mitsubishi Electric MELSEC iQ-R Series - Format 3

4 MESSAGES OF SERIAL COMMUNICATION MODULE
4.2 Message Formats of Each Protocol
31
4
Format 3
Message format
■Request message
■Response message (Normal completion: Response data)
■Response message (Normal completion: No response data)
■Response message (Abnormal completion)
Setting data
Set the following items.
Item Description Reference
Control code
(STX, ETX)
A code is defined for control. Page 34 Control code
Frame ID No. Specify the frame to be used. Page 36 Frame ID No.
Access route Specify the access route. Page 45 ACCESS ROUTE
SETTINGS
Request data Set the command that indicates the request content. Refer to "Request
data" rows of each command.
Page 62 COMMANDS AND
FUNCTIONS
Response data Store the read data for the command. Refer to "Response data" rows of
each command.
Sum check code The value of the lower one byte (8 bits) of the additional result regarding
the data in the sum check target range as a binary data.
Page 36 Sum check code
End code Indicates that the processing result is a normal completion or abnormal
completion.
• 4C/3C/2C frame: QACK (normal), QNAK (abnormal)
• 1C frame: GG (normal completion), NN (abnormal completion)
Page 38 End code
Error code Error code indicates the content of occurred error. Page 38 Error code
STX
02 H
ETX
03 H
Control code
Control code
Request data
Frame ID No. Access route Sum check code
Sum check range
STX
02H
ETX
03H
Control code Control code
Frame ID No. Access route End code Response data Sum check code
Sum check range
02 H 03 H
STX ETX
Control code Control code
Frame ID No. Access route End code
02 H 03 H
STX
ETX
Control code Control code
Frame ID No. Access route End code Error code