Specifications

8. Modbus TCP/RTU
Use of Modbus in RipEX.
RipEX supports Modbus RTU, Modbus TCP as well as their combinations:
Tab. 8.1:
Available with
Operating mode
Radio network behaviourRemotes’
protocol
Centre
protocol
Bridge, RouterModbus RTU over Radio channelRTURTU1
RouterModbus RTU over Radio channelRTUMultiple Mas-
ters RTU
1.1
Bridge, RouterTCP/IP protocol over Radio channelTCPTCP2
RouterTCP/IP protocol locally between Modbus device
and RipEX. TCP/IP overhead is not transferred
over Radio channel
TCPTCP3
RouterConversion of Modbus TCP to Modbus RTU on
the remote units
RTUTCP4
RouterUsing 3 and 4Combination
of TCP and
RTU
TCP5
RouterTCP master communicates with TCP or RTU
slaves, RTU Master only communicates with RTU
slaves, utilising 1.1 and 5
Combination
of TCP and
RTU
Multiple TCP
and multiple
RTU masters
6
8.1. Modbus RTU
A standard simple network design with a single Master and several Slaves running Modbus RTU.
RS232
ModbusRTU
M
RS232
ModbusRTU
S
RS232
ModbusRTU
S
S
RS232
ModbusRTU
S
RS485
ModbusRTU
S
Fig. 8.1: Modbus RTU
In Bridge mode, set the type of communication interface (RS232 or RS485) for the COM port as well
as the parameters of the serial interface, both for the Master and Slave.
43© RACOM s.r.o. – RipEX Application notes
Modbus TCP/RTU