The NEXTSTEP/OpenStep FAQ
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Laserwriter NTX
This are the pin assignments.
Eight-pin mini DIN-8 RS-422 Port
Pin Signal Description
1,3 SG Signal Ground
4 TxD+ Transmit Data +
5 TxD- Transmit Data -
8 RxD+ Receive Data +
9 RxD- Receive Data -
IBM-compatible DB-25 Plug LaserWriter DB-25 Plug
Signal Pin Pin Signal
Shield 1 ............ 1 Shield
TxD 2 ............ 3 RxD
RxD 3 ............ 2 TxD
RTS 4 ............ 4 RTS
CTS 5 ............ 5 CTS
DSR 6 ............ 8 DCD
GND 7 ............ 7 GND
............ 20 DTR
The other aspect is to set the DIP switch on the printer.
Here are the DIP switch settings:
Switch 1 Switch 2 Meaning
UP UP LocalTalk---RS-232 port disabled
DOWN UP Serial ports at 1200 Baud
UP DOWN Serial ports at 9600 Baud
DOWN DOWN RS-232 at 9600 Baud; RS-422 at 0 Baud
Switches 3 and 4 can probably be ignored---they're for strange
stuff like Diablo 630 and HP LaserJet emulation modes.
Switch 5 Switch 6 Meaning
DOWN DOWN XON/XOFF
UP UP XON/XOFF
DOWN UP ETX/ACK
UP DOWN DSR
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