3.1.4 Control Codes
The control codes (header and terminator) are as follows.
Name
Header
Terminator
NAK
3.1.5 Command Codes
The command codes are as follows.
Type
Character
WDR
SRR
Read
PRR
WRR
WDW
BDW
DDW
SDW
Write
WRW
BRW
DRW
SRW
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Character
?
3F
CR
0D
NAK
15
ASCII code
57
44
53
52
50
52
57
52
57
44
42
44
44
44
53
44
57
52
42
52
44
52
53
52
ASCII code
Beginning of a message.
Completion of a message.
Response when an error occurs.
52
Read data area in word unit
52
Read single relay bit
52
Read multiple relay bits
52
Read relay in word unit
57
Write data area in word unit
57
Write data area in byte unit
57
Write data area in digit unit
57
Write data area in bit unit
57
Write relay in word unit
57
Write relay in byte unit
57
Write relay in digit unit
57
Write relay in bit unit
Function
Function