SATEC BFM136 - Manual (Page 17)

‎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