E-Mon E34-6003200R*KIT - Manual (Page 26)

CLASS 3400 METER
62-0391-01 26
6.10 Modbus RTU Wiring
The Class 3400 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 SECTIONS 10 AND 11 FOR INSTRUCTIONS ON CHANGING I.D. AND IP
ADDRESSES.
RS-485
TERMINAL
M33274