Format 3 - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Format 3

Message format
■Request message
Control code
Frame ID No.
STX
02
H
■Response message (Normal completion: Response data)
Control code
Frame ID No.
STX
02
H
■Response message (Normal completion: No response data)
Control code
Frame ID No.
STX
02
H
■Response message (Abnormal completion)
Control code
Frame ID No.
STX
02
H
Setting data
Set the following items.
Item
Control code
(STX, ETX)
Frame ID No.
Access route
Request data
Response data
Sum check code
End code
Error code
Request data
Access route
Sum check range
Access route End code
Sum check range
Access route End code
Access route End code
Description
A code is defined for control.
Specify the frame to be used.
Specify the access route.
Set the command that indicates the request content. Refer to "Request
data" rows of each command.
Store the read data for the command. Refer to "Response data" rows of
each command.
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.
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)
Error code indicates the content of occurred error.
Control code
Sum check code
ETX
03
H
Control code
Response data
ETX
03
H
Control code
ETX
03
H
Control code
Error code
ETX
03
H
Reference
Page 34 Control code
Page 36 Frame ID No.
Page 45 ACCESS ROUTE
SETTINGS
Page 62 COMMANDS AND
FUNCTIONS
Page 36 Sum check code
Page 38 End code
Page 38 Error code
4 MESSAGES OF SERIAL COMMUNICATION MODULE
4.2 Message Formats of Each Protocol
4
Sum check code
31