Format 2 - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Format 2

Message format
■Request message
Control code
ENQ
05
H
■Response message (Normal completion: Response data)
Control code
STX
02
H
■Response message (Normal completion: No response data)
Control code
ACX
06
H
■Response message (Abnormal completion)
Control code Control code
NAK
15
H
Setting data
Set the following items.
Item
Control code
(ENQ, STX, ACK, NAK, ETX)
Block number
Frame ID No.
Access route
Request data
Response data
Sum check code
Error code
4 MESSAGES OF SERIAL COMMUNICATION MODULE
30
4.2 Message Formats of Each Protocol
Block No. Frame ID No.
Sum check range
Block No. Frame ID No.
Block No. Frame ID No.
Block No. Block No. Frame ID No. Frame ID No.
Description
A code is defined for control.
This can set arbitrarily in the range of '00H' to 'FFH'.
It is used for data defragmentation.
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.
Error code indicates the content of occurred error.
Access route Request data
Access route Response data
Sum check range
Access route
Access route Access route Error code Error code
Sum check code
Control code
Sum check code
ETX
03
H
Reference
Page 34 Control code
Page 36 Block number
Page 36 Frame ID No.
Page 45 ACCESS ROUTE
SETTINGS
Page 62 COMMANDS AND
FUNCTIONS
Page 36 Sum check code
Page 38 Error code