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4. Operating procedures
Setting external communication
2.Data transmission system
Com system
:
Half-duplex asynchronous system (Boring selecting system
)
Com. distance
:
Max. 500m
(
depending on influences from the environment
)
Connection method
:
Multidrop system (Max 1 :31 stations
)
Start bit
:
1 bit
Transmission code
:
ASCII (ASCII mode)
Binary (RTU mode)
Error check
:
LRC (ASCII mode)
CRC-16 (RTU mode)
3.Frame configuration
The RTU mode consists of a message portion only.
The ASCII mode consists of a starting character
“
:
(colon, 3AH)
”, a message and a terminating
character
“CR (carriage return, ODH) + LF(line feed), OAH”.
RTU mode
:
Message
ASCII mode
: : |
Message
|
CR
|
LF
4.Message configuration
The configuration of an MODBUS message is as follows for both RTU & ASCII modes:
Slave address
Function code
Data
Error check