SATEC SLC500 - Manual (Page 23)

23
C.3 RS-485 Cable Configuration
C.3.1 RS-485 Connection
6
7
TxD
RxD
TxD-
RxD-
9
TxD'
TxD
1
DB9 male connector
DB9 female connector
1746-BAS BASIC module Series PM-270/290 Powermeters
2
3
RxD-
TxD-
RxD
TxD
7
6
DB9 male connector
RxD-
TxD-
RxD
TxD
DB25 male connector
Series PM-290H Powermeters
Series PM-170 Powermeters
8
9
14
15
16
17
* A termination resistor should only be connected at the furthest end of the cable
Ω
R1
*R2
R1,R2 - 120