Owner's manual

Chapter 2 Installation Communications Connections
Series PM174 Powermeters 31
-
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.2COM.1
11
V
1513 14
69
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
-
+
RS-485 COMMUNICATION PORT
2 WIRE CONNECTION
R
S
-
4
8
5
P
C
(
P
L
C
)
D
E
V
I
C
E
S
UP TO 32 POWERMETERS
CABLE MAXIMUM LENGTH 1000M
RS485RS232
RS485/422-232
+
SHLD
-
CONVERTER
SHLD SHLD SHLD
R
t
RS-485 MULTI-DROP CONNECTION
2
PM172-N
R
t
1
MASTER
RS-232
RXD TXD
TX ENABLE RXD
RS-422 / RS-485
TXD
POWER
SUPPLY
COMMUNICATION CONVERTER
NL
POWER
-
+
-
+
-
+
t
1,R
t
R 2=200-500 Ohm, 0.5W
2 (1)
2 (2)
PM172-N
2 (32)
PM172-N
Figure 2-33 COM2: RS-485 2 Wire Connection