
2105 Interface Module
Section 3 Modbus Protocol and 2100 Output
3-3
Each module capable of Modbus Protocol communication will
automatically create its own specific ASCII address within the
site, using:
• The model numbers of the modules
• The user-defined module names
3.3 Configurations
A variety of configurations can be made with Modbus, either
through direct connection or through a modem.
In the example shown in Figure 3-1, you are direct-connecting a
server PC to two individual 2100 sites through Modbus, using
the COM ports on the OPC Server, which are directly connected
to the remote sites.
Connection to the module is made through the RS-232 communi-
cation port on the top of the module.
Note
For low power operation, we recommend connecting the mod-
ule(s) to the computer using the straight-through cable (Isco
part number 60-5314-529), which consumes less power,
instead of our standard interrogation cable.
In Figure 3-1, the OPC Server PC must have two COM ports.
Modbus requires one COM port each, for direct connection of
each site.
Figure 3-1 Configuration example (direct connection shown)
2150
2150
OPC
Server
Process
Control
COM
port 1
COM
port 2
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