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E204701
2-10
2: Using the ProtoCom/ProtoCom-Lon
2.6: Step 6 - Connect the ProtoCom/ProtoCom-Lon to the Meter
For RS485 serial communication, the six pin connector at the bottom of the Proto-
Com/ProtoCom-Lon (labeled HOST) is used to connect the ProtoCom to the EIG meter
and to the power supply. (See Section 1.5 for detailed information on the ProtoCom/
ProtoCom-Lon’s connections).
• Pins 1 through 3 are for the meter’s RS485 connection, though the RS485 GND (Pin
3) is not typically connected.
• Pins 4 through 6 are for power.
CAUTION! DO NOT CONNECT POWER YET
.
Figure 2.4: HOST RS485 Connections
The EIG meters have the following RS485 connections:
• The Shark® meters, the Nexus® meters, and the MP200 Metering System have a
two wire RS485 connection that can connect directly to the ProtoCom’s RS485
connections:
1. Connect the meter’s B+ to the ProtoCom/ProtoCom-Lon’s Tx +/- connection.
2. Connect the meter’s A- to the ProtoCom/ProtoCom-Lon’s Rx +/- connection.
• The DMMS 425 meter has a four wire RS485 connection.
1. Connect the meter’s R + and T+ wires together, and connect the combined
wire to the ProtoCom’s Tx+/-.
Device
Pins
ProtoCom
Pin
#
Pin
assignment
Pin
RS
‐
485
+
Pin
1
RS
‐
485
+
Pin
RS
‐
485
‐
Pin
2
RS
‐
485
‐
Pin
GND
Pin
3
RS
‐
485
GND
Power
In
(+)
Pin
4
V
+
Power
In
(
‐
)
Pin
5
V
‐
Frame
Ground
Pin
6
FRAME
GND