E-Mon E-D5-600800-S*SPL3-V3KIT3 - Manual (Page 30)

DIN-MON™ SMART METER
62-0442—04 30
4.8.2 Meter RS-485 Wiring
1. Connect the + (high) terminal of each meter together so
that the + terminals on all meters are linked, + to +...
2. Connect the – (low) terminal of each meter together so
that the - terminals on all meters are linked, – to –...
3. Connect the SC (signal common) terminal of each meter
so that the SC terminals on all meters are linked, SC to
SC.
4. Install termination resistors (120 Ohm) at each end of the
daisy-chain cable run.
5. Connect the SH (shield) of each cable so that the SH on all cables are linked, SH
to SH. Terminate one end of SH to Earth ground. The SH should not be con-
nected to the meter.
NOTE: SC (signal common) is electrically connected to the isolated RS-485
digital ground of the meter. If there are devices on the network that do
not have SC terminal connection, skip over these devices. NEVER con-
nect SC to SH (shield).
4.8.3 USB Key Wiring
The USB Key allows you to connect Din-Mon™ meters to a personal computer that
has E-Mon Energy™ software installed. The USB key must be located within 15 feet of
the host computer.
Fig. 24. USB Key to RS-485 Network.
The USB Key plugs into the PC’s USB port and provides a termination point for the
RS-485 wiring from the meters. A termination is needed for the other end of the RS-
485 network. The USB Key is labeled + (plus), – (minus), “SC”; wiring must match the
same positions on the meters. Refer to RS-485 Wiring section for details. If more than
52 meters are to be monitored, additional USB Keys can be utilized to connect them to
the PC.
M35111
RS-485 TERMINAL
SC – +
PC WITH USB PORT
USB KEY
M35112
UP TO 52 METERS ON RS-485 NETWORK
UP TO 4000 FEET TOTAL CABLE LENGTH
TERMINATION
120 Ohm
TERMINATION
120 Ohm