18
ASYNC/SYNC INDUSTRIAL LINE DRIVER
4.2 Four-Wire Installation
When communicating over a two-twisted-pair circuit, the Async/Sync Industrial
Line Driver can operate full or half duplex, point-to-point or multipoint. In two-
pair point-to-point applications, you’ll need a pair of Line Drivers for each circuit
(one at each end of the two-pair cable). In two-pair multipoint applications you’ll
need three or more Async/Sync Industrial Line Drivers. These can be connected
using a daisychain or star topology.
4.2.1 F
OUR
-W
IRE
C
ABLE
C
ONNECTION
V
IA
RJ-45
The RJ-45 jack on an Async/Sync Industrial Line Driver is prewired for a standard
telco wiring environment. To be sure you have the right wiring, use the table below
as a guide.
RJ-45
Signal
1 ..............NC
2 ..............GND†
3 ..............RCV
4 ..............XMT
5 ..............XMT
6 ..............RCV
7 ..............GND
8 ..............NC
†Connection to ground is optional.
Proper crossing of pairs between the two Line Drivers is as follows:
Signal
Pin#
Color*
Color
Pin#
Signal
GND†
2
Orange ............Brown
7
GND
RCV
3
Black ................Green
5
XMT
XMT
4
Red ..................Yellow
6
RCV
XMT
5
Green ..............Black
3
RCV
RCV
6
Yellow ..............Red
4
XMT
GND
7
Brown ..............Orange
2
GND
*Standard color codes—yours may be different.
†Connection to ground is optional.