Honeywell 500 - Manual (Page 9)

CLASS 500 ADVANCED KWH/DEMAND METER
9 62-0304—05
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, or it can be put on the network as the only device on
the network and Modbus address changed before adding additional devices.
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.
Fig. 10. Modbus installation overview.
METHOD 1: DAISY-CHAIN WITH WIRE TERMINAL (MOST COMMON METHOD)
1. Connect the “HI” terminal (Display PCB J3 Pin 1) of each Class 500 unit together so that all unit Hl terminals are linked (Hl
to Hl to Hl, etc.).
2. Connect the “LO” terminal (Display PCB J3 Pin 2) of each Class 500 unit together so that all unit LO terminals are linked
(LO to LO to LO, etc.).
3. Connect the “GND” terminal (Display PCB J3 Pin 3) of each Class 500 unit together so that all unit GND terminals are
linked (GND to GND to GND, etc.).
4. After completing the wiring of connector J3 for all units, complete the wiring to the EMS through the appropriate input termi-
nals (RS485 or Ethernet).
METHOD 2: DAISY-CHAIN WITH MODULAR JACKS
1. Each display board has two RJ-11 jacks available to facilitate RS-485 daisy-chain connections. Using RJ-11 four-conductor
cable, wire each cable end pin to pin. Interconnect all units together with the RJ-11 cabling.
2. After daisy-chaining the units is complete, the system can be interfaced through the wire terminal on the meter closest to
the EMS (see method 2).
LON and BACnet MS/TP Wiring
For LON and BACnet MS/TP connections, follow standard wiring procedures/topologies for these communication types. Both of
these connections are found on the communications board which sits on the main power board (not on the display board). The
LON is a two position terminal block for twisted pair, and the BACnet MS/TP is a 3 position terminal block.
M28752
EMS OR CONTROL
UNIT WITH MODBUS
COMMUNICATIONS