E-Mon E50-6003200J*-N-KIT - Manual (Page 28)

GREEN CLASS NET METER
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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