Instruction Manual

29
Operation Method
RS485 Communication Function
4.2 Message Types
Message types include transmission request messages from the host computer and transmission
reply messages from this unit.
All codes from STY, address, request, identifier to ETX (except BCC) are represented by ASCII
codes.
4.3 Request Message Structures (transmission from the host computer to the unit)
4.3.1 Structure of Read Request Messages
S
T
X
R
E
T
X
B
C
C
4.3.2 Structure of Write Request Messages
S
T
X
W
E
T
X
B
C
C
4.3.3 Structure of Storage Request Messages
S
T
X
W
E
T
X
B
C
C
Start code
Address
Request (read)
Identifier
-
End code
BCC data
Start code
Address
Request (write)
Identifier
Numeric data
End code
BCC data
Start code
Address
Request (write)
Identifier
-
End code
BCC data