E-Mon E-PS-A-RTU-N - Manual (Page 16)

Chapter 2 Installation Remote Display I N S T A L L A T I O N
16 PowerSmart+ Advanced Power Quality Meter
At distances of up to 100 m, the display receives power through the communication cable
directly from the meter. Connect pins 1 and 8 on both sides as shown in Figure 2-13.
At distances above 100 m, supply power from a separate 12V DC power source (a 12V
AC/DC adapter can be used). Connect the positive wire to pin 1 and the negative wire to
pin 8 as shown in Figure 2-14.
Pin Signal
1 +12V
5 RS-485 + (plus)
7 RS-485 – (minus)
8 GND
15 Chassis ground
Figure 2-13 Self-powered remote display connection
Figure 2-14 Remote display powered from a 12V DC power source
If required, the remote display may be connected to one of the regular meter ports COM1
or COM2 via a three-wire RS-485 communication cable using a separate 12V DC power
source as shown in Figure 2-14. See
Communications Connections for connector pin-outs
and connection diagrams. The meter port settings must be as follows: Modbus RTU
protocol, RS-485 interface, 19200 baud, 8-bits/no parity.