HP Laserjet 4 and Laserjet 5 printer
Note: Does not apply to Laserjet 4 Plus
HPLJ4 to DCB mux cable
HPLJ4 DE9P
Direction
SR RJ45
SPL DB25P
Signal
1
===>
8
4
RTS
2
===>
6
2
TxD
3
<===
5
3
RxD
4
<===
2
8
DCD
5
====
4
7
SGND
6
===>
3
11
Busy
Available from DCB as LJ4 Remote Adaptor and Line Cord