HP QMS 1660 - Manual (Page 233)

Cable Pinouts
B-11 Technical Specifications
LocalTalk (Optional Interface)
The following table provides the pinouts for the printer’s optional 8-pin
LocalTalk interface:
Macintosh to Serial
The following table provides the pinouts for a cable connecting the
Macintosh printer or modem port to the printer’s serial port:
» Note: To download printer system software from a Macintosh, you
must have this type cable.
Pin Name Pinout View from Printer Interface
1,2,7 Reserved
3 Transmit Data - (TXD)
4 Signal Ground (GND)
5 Receive Data - (RXD)
6 Transmit Data + (TXD)
8 Receive Data + (RXD)
To Macintosh
DB-9 Female To Printer
DIN-8 Male
HandshakeOut 1 7 RTS
HandshakeIn 2 8 CTS
TXD- 3 3 TXD
RXD- 5 2 RXD
GND,RXD+ 4,8* 5 GND
6 Not Used
7 Not Used
* Pins 4 and 8 must be connected together on the DIN-8 cable.