DCS FIELDBUS
COMMUNICATION INTERFACE CONNECTION
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1TGC908004
5.4.
DCS Fieldbus
Modbus RTU Topology
There are three options for MODBUS RTU interface (Serial 2 Sub-D connector) available for
the Digital Gateway which can be selected by parameter in MNavigate tool: RS 232, RS 422
and RS 485.
Max. cable length varies from 15m (RS232) up to 1200m (RS485/422) depending on transmis-
sion speed and repeater type in use. Cable length can be extended using fiber optic modems
which in addition also galvanically isolate the communication, prevent shield currents and
provides best option for EMC immunity.
The serial port interface of the Digital Gateway
is not galvanically isolated. To
achieve this, it is recommended to use 3rd party product if required.
5.4.1.1.
RS232
Allows only a simple point to point topology between Master and Slave. The maximum dis-
tance according to the standard is 15 meters.
Figure 17 Digital Gateway RS232 connection via Serial 2 to DCS
Summary of Contents for LVS Digital
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