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CLASS 500 ADVANCED KWH/DEMAND METER
62-0304—05 8
Wiring to the Network
RS-485 Wiring for BACnet MS/TP, Modbus RTU, or EZ-7
The Class 500 Meter contains an RS-485 serial communications port allowing it to communicate via BACnet MS/TP, Modbus
RTU, or EZ-7. The units can be daisy-chained together over distances of up to 4000 feet. Up to 52 unit nodes can be networked
together. The meters are networked in a daisy-chain configuration with BELDEN 1120A cable or an equivalent. A cable rating of
600V allows a RS-485 network to be connected to 480-volt meters. Communications wiring should enter/exit the Class 500 Meter
enclosure through the 1/2 in. hole located on the upper (top) surface of the enclosure using a 4-conductor, UL-approved
telephone cord terminated with an RJ-11 male connector.
NOTE: A 3-screw terminal block is also available for the RS-485 wiring, as an optional method.
Fig. 8. Modbus terminal location and wiring method.
Fig. 9. BACnet wiring with RS-485 connection.
M28751
TERMINAL LOCATION
WIRING METHOD
BACNET MS-TP: NOTE
3 POSITION TERMINAL
BLOCK FOR RS-485
CONNECTIONS