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G-1
Appendix G: Interface connector pinouts
Use the following pinouts and descriptions of the various printer interface connectors if
you need to purchase or make a new cable.
RS-422 Serial:
IBM PC/XT (P1)
25 PIN SERIAL PORT
SIGNAL PIN DIRECTION
SHELL
CH. GND 1
TXD 2
RXD 3
RTS 4
CTS 5
DSR 6
SIG.GND 7
DCD 8
DTR 20
PIN
SHELL
1
2
3
4
5
6
7
8
HSKO
HSKI
TXDB-
SIG.GND
RXDB-
TXDB+
NC
RXDB+
SIGNALDIRECTION
PRINTER (P2)
MINI-DIN 8
BRAIDED SHIELD
NC
NC
NC
Uni-directional Parallel
PIN SIGNAL DESCRIPTION DIRECTION
1 /STROBE Data Strobe In to Printer
2 D1 Data Bit 1 In
3 D2 Data Bit 2 In
4 D3 Data Bit 3 In
5 D4 Data Bit 4 In
6 D5 Data Bit 5 In
7 D6 Data Bit 6 In
8 D7 Data Bit 7 In
9 D8 Data Bit 8 In
10 /ACK Acknowledge Out from Printer
11 BUSY Busy Out
12 PERROR Paper Empty Out
13 SELECT Select Out Out
14 /AUTOFD Not Used In
15 NC Not Used
16 GND Signal Ground