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E204701
2-11
2: Using the ProtoCom/ProtoCom-Lon
2. Connect the R- and T- wires together and connect the combined wire to the
ProtoCom/ProtoCom-Lon’s Rx +/-.
See the diagram below.
Figure 2.5: Connecting RS485 between DMMS 425 and ProtoCom/ProtoCom-Lon
For Ethernet communication, use an Ethernet cable to connect from the device’s RJ45
port to the RJ45 port on the ProtoCom/ProtoCom-Lon - see
ProtoCom-Lon Ethernet Port, on page 1-11
2.10.4: Configure the Ethernet
Device Connection, on page 2-25
, for configuration instructions.
G
R+
T+
R-
T-
RS485
Communications
Port
DMMS 425
Meter
Gnd
Tx+/-
Rx+/-
-
ProtoCom/ProtoCom-Lon