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2 Simple Application Controllers
The Command String 7
7 - 22
7.6.2 Read Command
1 ) Command Specification
Format B is shown.
2 ) Command Example
a ) Read Status of Output O01 in Station 00.
The received message shows that the Status of Output O01 is OFF.
07 = 01 + (bytes)
Computer
α
2 Controller
01 + 01 + 01 + 01 + 01 + 01
S
T
X
Command
Format No.
Station No.
Device No.
(HB)
No. of devices
Device code
Device No.
(LB)
Sum check
(HB)
E
T
X
Sum check
(LB)
No. comm
bytes
07H
03 =
(bytes)(bytes)
05
or
S
T
X
Complete flag
Format No.
Station No.
Device status
S
T
X
No. of devices
Sum check
(HB)
E
T
X
Sum check
(LB)
Format No.
Station No.
Command
No. comm
bytes
03H
No. comm
bytes
05H
01 + 01 + 01 = 01 + 01 + 01 + 01 + 01
04 = 01 + 01 +
N
A
K
Format No.
Station No.
S
T
X
Error Code
No. comm
bytes
04H
01 + 01 (bytes)
Computer
α
2 Controller
S
T
X
Complete
flag
Format
No.
Station
No.
Device
status
S
T
X
No. of
devices
Sum check
(HB)
E
T
X
Sum check
(LB)
Format
No.
Station
No.
Command
No. comm
bytes
03H
No. comm
bytes
05H
02H 40H 00H 21H
02H 41H 00H 00H 01H 00H 03H 42H 00H
S
T
X
Command
Format
No.
Station
No.
Device No.
(HB)
No. of
devices
Device
code
Device No.
(LB)
Sum check
(HB)
E
T
X
Sum check
(LB)
No. comm
bytes
07H02H 41H 00H 00H 01H 42H 01H 00H 03H 00H85H