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