HP Deskjet 320 Solutions Guide - Page 112

Installation and Printer Drivers for the Macintosh, Table 5-5. The Mac Cable Pin Assignments at

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Pin Number 1 2 3 4 5 6 7 8 Table 5-5. The Mac Cable Pin Assignments at the 8 Pin Mini DIN connector Signal Description Unused DTR Output Handshake This pin sends DTR signal (asynchronous mode) or Clock signal (synchronous mode) from the printer to the computer. In asynchronous mode, the printer indicates when it is ready to receive information from the computer. Data transmission is enabled when DTR Output Handshake is set on (+5V) by the printer. Data transmission is disabled when DTR is set off (-5V) by the printer. In synchronous mode, the printer sends the Clock signal to synchronise the transmission between the printer and the computer. Receive Data Input Line Bit serial data transmitted to the printer from the computer. Used in RxD- conjunction with RxD+ (pin 6) Shield Ground Electrical ground line for connecting the cable shield. Transmit Data Output Line Bit serial data transmitted to the computer from the printer. Used in TxD- conjunction with TxD+ (pin 8). Receive Data Input Line Bit serial data transmitted to the printer from the computer. Used in RxD+ conjunction with TxD- (pin 3). Unused Receive Data Output Line Bit serial data transmitted to the printer from the computer. Used in TxD+ conjunction with TxD- (pin 5). 5-6 Installation and Printer Drivers for the Macintosh

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5-6
Installation and Printer Drivers for the Macintosh
Table 5-5. The Mac Cable Pin Assignments at the 8 Pin Mini DIN connector
Pin Number
Signal
Description
1
Unused
2
DTR Output Handshake
This pin sends DTR signal (asynchronous mode) or Clock signal
(synchronous mode) from the printer to the computer.
In asynchronous mode, the printer indicates when it is ready to receive
information from the computer. Data transmission is enabled when DTR
Output Handshake is set on (+5V) by the printer. Data transmission is
disabled when DTR is set off (-5V) by the printer.
In synchronous mode, the printer sends the Clock signal to synchronise the
transmission between the printer and the computer.
3
Receive Data Input Line
RxD-
Bit serial data transmitted to the printer from the computer. Used in
conjunction with RxD+ (pin 6)
4
Shield Ground
Electrical ground line for connecting the cable shield.
5
Transmit Data Output Line
TxD-
Bit serial data transmitted to the computer from the printer. Used in
conjunction with TxD+ (pin 8).
6
Receive Data Input Line
RxD+
Bit serial data transmitted to the printer from the computer. Used in
conjunction with TxD- (pin 3).
7
Unused
8
Receive Data Output Line
TxD+
Bit serial data transmitted to the printer from the computer. Used in
conjunction with TxD- (pin 5).