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10 modbus rtu wiring, 11 bacnet ms/tp wiring – E-Mon E50-6003200J*-N-KIT User Manual

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GREEN CLASS NET METER

62-0416-01

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6.10 Modbus RTU Wiring

The Green Class Net Modbus meter communicates with building automation

equipment over a 2-wire (3-conductor) RS-485 network using Modbus RTU protocol.

The meters are networked in a daisy-chain configuration (Section 6.7) with BELDEN

1120A cable or equivalent. The cable rating of 600V allows the RS-485 network to be

connected to 480-volt meters. Up to 52 meters can be installed on a network string.

The maximum combined length of all daisy-chained cables must not exceed 4000 feet.

The meter-to-network connection is through the 3-screw terminal which is located on

the Main Power Board of the meter.

Fig. 14. Modbus RTU Wiring.

The meter is shipped with a Modbus ID number of 01. This must be changed if the

network has more than one meter installed. The change must be done before the

meter is introduced into the network. The meter can be numbered from 1 to 247. There

can be no duplicate numbers on a network, so caution must be taken when assigning

a meter ID number prior to its installation on the RS-485 network.

SEE SECTION 10 FOR INSTRUCTIONS ON CHANGING ID AND IP ADDRESSES.

6.11 BACnet MS/TP Wiring

BACnet MS/TP wiring is the same as Modbus and EZ7 wiring. See Sections 10 and 11

for instructions on changing I.D. and IP addresses.

RS-485

TERMINAL

M33274