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Command Connection
5-4
Command Connection
A command connection function allows the Controller to perform both read and write operations at a
time by connecting commands from the host with "+". Any of the following commands can be paired.
- Read (RD)
- Write (WT)
- Polling Single Auto Read (PR)
- Polling Single Auto Write (PW)
- Memory Check (MC)
- Memory Calculation (MK)
Example of command connection
In a command connection function, a single STX, Node No., BCC and ETX are shared each, and
connected to each other using "+".
Command Frame Structure
STX Node No.
1
2
Response Frame Structure
1. Normal completion
STX Node No.
1
2
2. Abnormal completion
With abnormal completion, the command code and response code of a command (1) are re-
turned.
STX Node No.
1
2
5-30
Command
(1)
Retry
Response
flag
(1)
1
Command(1)
Retry
Response
code
flag
code
1
2
2
Fixed
Command
"+"
1
Fixed
"+"
1
ETX BCC
1
1
Section 5-4
ETX BCC
(2)
1
Response
(2)
1
ETX BCC
1
1
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