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5-7
Section
Communications Subcommands
89
Response Frame Structure
STX
Node No.
Retry
Flag
Command
code
MS
Response
code
00
ETX
BCC
MS read
information
1
2
2
3
1
1
1
2
MS setting information
MRW:
Sets Controller as a Read/Write Master.
MRO:
Sets Controller as a Read-only Master.
SRW:
Sets Controller as a Read/Write Slave.
SRO:
Sets Controller as a Read-only Slave.
***
:
Just reads the current controller sync setting.
MS read information
MRW:
Controller is set as a Read/Write Master.
MRO:
Controller is set as a Read-only Master.
SRW:
Controller is set as a Read/Write Slave.
SRO:
Controller is set as a Read-only Slave.
***
:
Controller sync setting has not been made yet.
To use the MASTER/SLAVE SWITCH command, the Controller’s DIP switch
must be set so that the sync setting is made from the host (SW3–2 OFF, SW3–3
ON, and SW3–4 ON).
If SW3 is set so that the sync setting is made from the host, always set the Con-
troller’s sync setting from the host before beginning communications with the
Tags.
5-7
Communications Subcommands
5-7-1 POLLING CHECK: PC
This subcommand is used after sending the POLLING AUTO command to
check the results of the execution of the POLLING command.
Command Frame Structure
STX
Node No.
Command
code
PC
Chan-
nel
ETX BCC
1
2
2
1
1
1
Channel
Always 1.
The following frame structures are used for the response when the POLLING
AUTO command is executed after the completion of communications with ID
Tag and before the completion of communications with the ID Tag.
1, 2, 3...
1. POLLING AUTO
STX
Node No.
Retry
Flag
Command
code
PR
Response
code
00
ETX
BCC
Read data
Specified
quantity
1
2
2
1
1
1
2
2. POLLING AUTOWRITE
STX
Node No.
Retry
Flag
Command
code
PW
Response
code
00
ETX
BCC
1
2
2
1
1
1
2
3. Before Completion of Communications with ID Tag
STX
Node No.
Retry
Flag
Command
code
PR or PW
Response
code
74
ETX
BCC
1
2
2
1
1
1
2
Precautions
Response Frame
Structure
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