Wiring to the network – Honeywell 500 User Manual

Page 8

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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

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