HP Laserjet 4 and Laserjet 5 printer

Note: Does not apply to Laserjet 4 Plus

HPLJ4 to DCB mux cable

HPLJ4 DE9PDirectionSR RJ45SPL DB25PSignal
1===>84RTS
2===>62TxD
3<===53RxD
4<===28DCD
5====47SGND
6===>311Busy
Available from DCB as LJ4 Remote Adaptor and Line Cord