Class 3200 Meter - E-Mon

6.10 Modbus RTU WiringCLASS 3200 METERThe Class 3200 Modbus option meter communicates with building automationequipment over a 2-wire (3-conductor) RS-485 network using Modbus RTU protocol.The meters are networked in a daisy-chain configuration with BELDEN 1120A cable orequivalent required. The cable rating of 600V allows the RS-485 network to beconnected 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 onthe Main Power Board of the meter. Tighten the terminals to 2.2 in-lb.Fig. 16. RS-485 Terminal.The meter is shipped with a Modbus ID number of 02. NOTE: Modbus address mustbe changed to 01 for open protocol for BACnet (Optional) to function as specified. Thismust be changed if the network has more than one meter installed. The change mustbe done before the meter is introduced into the network. The meter can be numberedfrom 1 to 247. There can be no duplicate numbers on a network, so caution must betaken when assigning a meter ID number prior to its installation on the RS-485network.27 62-0390-02