E-Mon E-PS-A-RTU-N - Manual (Page 31)

Chapter 2 Installation Communications Connections
PowerSmart+ Advanced Power Quality Meter 31
Figure 2-33 COM2: RS-485 2 Wire Connection
- 4-20mA 9 8 COM.1 :
ATTENTION
Devices
Static-Sensitive
Static-Safe
Workstations
Handle Only at
POWER SUPPLY
RS-422/RS-485
16
+RX
COM.2 COM.1
11
V
15 13 14
6 9 N
1 5 -TX +TX -RX
V
MODEM
PROFIBUS
ETHERNET
RS-232/422/485 STANDARD
3
17
12 L/+
N/- 10
ANALOG IN/OUT :
0-1mA
0-20mA
V
-+1mA LOW DC N
(24) 18-36VDC
(48) 36-72VDC S
2 (12) 10-16VDC
+ 7
3
4 WIRE CONNECTION
RS-485/422 COMMUNICATION PORT
TO COMMUNICATION
SYSTEM
_
+
+
_
Rx
Tx
Figure 2-34 COM2: RS-422/485 4 Wire Connection