Rs-485 Wiring - Honeywell H Series Installation Instructions Manual

H-SERIES GREEN CLASS NET METER

6.7 RS-485 Wiring

RS-485 communication allows a computer or modem to communicate with one or
more Green Class Net meters. You can connect as many as 52 meters along a 4000-
4000 foot RS-485 cable run. Green Class Net meters are available with your choice of
RS-485 communication options: Modbus, BACnet, E-Mon Energy (EZ7) Standard.
RS-485 communication allows a computer or modem to communicate with one or
more Green Class Net meters. You can connect as many as 52 meters along a 4000-
foot RS-485 cable run.
There are four communication protocols available through the Green Class Net RS-
485 connection. They are EZ7, Modbus RTU, BACnet MS/TP, and Lonworks FT-10.
The protocol is chosen when ordering the Green Class Net meter. A second protocol is
available through the Ethernet port. The Ethernet protocol is also chosen when the
meter is ordered. See ordering information for the available choices.
Daisy-Chain Method
This is the simplest method for connecting meters together.
1. Connect the +(high) terminal of PORT 1 of each Green Class Net meter together
so that the + terminals on all meters are linked, + to + to +...
2. Connect the -(low) terminal of PORT 1 of each Green Class Net meter together
so that the - terminals on all meters are linked, - to - to - to.
62-0424-02
Fig. 11. Daisy-chain Configuration.
24
EMS OR WEBs
CONTROLLER
CONNECTION VIA
DAISY CHAIN RS-485
M31600