CLASS 320 METER
62-0397-02 22
6.7 RS-485 Wiring (continued)
* An alternate version of firmware is available that replaces Modbus RTU with BACnet
MS/TP.
The meter must be ordered with this option if BACnet is desired instead of
Modbus.
There are two connection methods, daisy-chain and wire terminal, for RS-485
communications.
Daisy-Chain Method
This is the simplest method for connecting meters together.
Fig. 11. Daisy-chain Configuration.
1. Connect the +(high) terminal of PORT 1 of each meter together so that the + ter-
minals on all meters are linked, + to + to +...
2. Connect the -(low) terminal of PORT 1 of each meter together so that the - termi-
nals 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.
4. Torque screws to 2.2 in-lb.
Fig. 12. RS-485 Terminal.
M32776
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