Modbus communication
A
A.1 Modbus addressing model
The device allows read/write access to one holding register block. All devices are mapped to
this Modbus address space.
A.2 Modbus communication
Table A-1 General Modbus settings
Modbus
register
Data type /
Size in
bytes
Parameter Description Default val‐
ue
[units]
(units
register)
Value range /
Setting options
Access
level
8291 Unsigned /
2
Restart com‐
munication
Restarts the communication using
configured slave address, baud rate
and parity/framing.
-
● 0: Cancel
● 1: Restart
Write only
8005 Unsigned /
2
Slave address
(HW)
DIP switch setting on the transmitter
cassette. Address is used if DIP
switch is set to a value > 0.
- - Read only
8297 Unsigned /
2
Slave address
(SW)
Software address of Modbus inter‐
face. Address is used if switch is set
to 0.
1 1 - 147 Read /
write
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 133
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