User guide

CLASS 5000 METER
23 62-0392-03
6.7 RS-485 Wiring
RS-485 communication allows a computer or modem to communicate with one or
more Class 5000 meters. You can connect as many as 52 meters along a 4000-foot
RS-485 cable run.
There are four communication protocols available through the Class 5000 RS-485
connection. They are EZ7, Modbus RTU, BACnet MS/TP, and Lonworks FT-10. The
protocol is chosen when ordering the Class 5000 meter. A second protocol is available
through the Ethernet port. The Ethernet protocol is also chosen when the meter is
ordered. See ordering information for the available choices.
Daisy-Chain Method
This is the simplest method for connecting meters together.
Fig. 11. Daisy-Chain Configuration.
1. Connect the +(high) terminal of PORT 1 of each meter together so that the + ter-
minals on all meters are linked, + to + to +...
2. Connect the -(low) terminal of PORT 1 of each meter together so that the - termi-
nals on all meters are linked, - to -...
3. Connect the GND terminals of PORT 1 of each meter so that the GND terminals
on all meters are linked, GND to GND to GND.
Fig. 12.
M32776
RS-485
TERMINAL
M33274