SATEC BFM136 User Manual
Page 17
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Chapter 2 Installation
Communications
BFM136 Branch Feeder Monitor
17
2
BFM136
BFM136
BFM136
R t 1
MASTER
R
S
-23
2
R
X
D
T
X
D
T
X
E
N
A
B
L
E
R
X
D
RS-4
2
2
/
R
S
-4
8
5
T
X
D
P
O
WE
R
UP TO 32 POWERMETERS
CABLE MAXIMUM LENGTH 1000M
RS485
RS232
RS485/422-232
+
SHLD
-
CONVERTER
SHLD
SHLD
SHLD
R t
S
U
P
P
L
Y
COMMUNICATION CONVERTER
N
L
P
O
WE
R
-
+
-
+
-
+
t1,
R
t
R 2=200-500 Ohm, 0.5W
+
+
+
Figure 2-10 RS-485 multidrop connection
+Tx
-Tx
-Rx
+Rx
RS-422 COMMUNICATION PORT
4 WIRE CONNECTION
SYSTEM
TO COMMUNICATION
Tx
Rx
Tx
Rx
Figure 2-11 RS-422/485 4-wire connection
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