5.6 RS-485 Wiring
The Green Class Net Meter contains an RS-485 serial communication
port allowing it to communicate with a computer. The units can be daisy
chained together over distances of up to 4,000 feet. Using an E-Mon
RS232/485 key, up to 64 unit nodes, including one master node, can
be networked together. Communication wiring should enter/exit the en-
closure through the 1/2” hole located on the upper side surface of the
enclosure using 4-conductor UL approved telephone cord terminated
with an RJ11 male connector.
NOTE: When multiple meters are used, the meter ID (1A to 8Z)
must be different on each unit installed.
NOTE: The Green Class Net Meter will not function as a master in
a master-slave confi guration. An E-Mon IDR or Class 3000 unit
must serve the role of master in this confi guration.
CAUTION: Be sure you do not confuse the optional modem’s
telephone jack(s) with the RS485 jacks. Reversing the wiring can
cause permanent unit damage to either communication port.
There are two methods for connecting Green Class Net Meters together.
Method 1: Daisy chain with modular jacks
1. Each display board has two RJ11 jacks available to facilitate RS485
daisy chain connections. Using RJ11 4-conductor cable, wire each
cable end pin to pin. Interconnect all units together with the RJ11
cabling.
2. After daisy chaining the units is complete, you need to decide what
device will be used to communicate with this network of Green Class
Net Meters.
a. Option 1: Internal modem - installing a master unit such as Class
3000 or E-Mon IDR within the daisy chain of Green Class Net Meter
units. The selected units’ internal modem will then communicate via
the RS485 network. Simply connect a phone line to one of the two
telephone jacks inside the Class 3000/E-Mon IDR to the telephone
line to complete the installation.
b. Option 2: Local Computer - If adding the Class 3000 or E-Mon IDR is
not an option, a locally residing computer can communicate with the
RS-485 network. The computer must be connected to the E-Mon
RS232/485 key. The RS232/495 key is then connected to one of the
daisy chained Green Class Net Meter units’ available RS-485 jacks
using RJ11 cabling.
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