E-Mon E34-6003200R*KIT - Manual (Page 19)

CLASS 3400 METER
19 62-0391-01
6.7 RS-485 Wiring
RS-485 communication allows a computer or modem to communicate with one or
more Class 3400 meters. You can connect as many as 52 meters along a 4000-foot
RS-485 cable run.
There are three communication protocols available through the Class 3400 RS-485
connection. They are EZ7, Modbus RTU, BACnet MS/TP, and Lonworks FT-10
(Lonworks FT-10 available only through an optional module). The protocol is chosen
when ordering the Class 3400 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.
Fig. 8. Daisy-chain Configuration.
1. Connect the +(high) terminal of PORT 1 of each 3400 meter together so that the
+ terminals on all meters are linked, + to + to +...
2. Connect the -(low) terminal of PORT 1 of each 3400 meter together so that the -
terminals on all meters are linked, - to - to -...
3. Connect the GND terminals of PORT 1 to meter 1 ONLY. The GND terminals
should not be linked to each meter.
Fig. 9. RS-485 Terminal.
M32776
RS-485
TERMINAL
M33274