Modbus master
RS422/485
TCP/IP
PLC Modbus slaves
GUID-0F99AFF8-EEF0-4D81-80DD-72CF8104F053 V2 EN
Figure 6:
Network master to serial slaves mode
In that mode, the device acts like network server where masters (clients) can connect
(the default port being 502) and transmit Modbus requests. The device makes
conversions between network and serial protocols. If the slave does not reply during
defined timeout or if the reply is corrupted, the device sends “gateway exception
message” back to the master if the exception generation is enabled. Otherwise, the
reply is returned. Multiple masters can connect simultaneously to the Gateway, which
handles the multiplexing between masters.
9.3
Configuring Modbus modes
9.3.1
Configuring the serial master to network slaves mode
1.
In the left pane, under
Serial Port and I/O
, click
Modbus Gateway (RSx)
.
2.
Set
Enable Modbus gateway
to
Yes
.
3.
Set
Gateway mode
to
Serial master to network slaves
.
1MRS758460 B
Section 9
Modbus application settings
ARG600 Dual SIM Variant
35
User Manual