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Table A-2. 20mA Port Pin Assignments
Figure A-2. 20m A Port
Pin
I
2
3
5
7
8
Signal
~
12 Volt
Transmit Data (negative)
Receive Data (negative)
Transmit Data (positive)
Receive Data (positive)
Ground
Table A-3. Printer Port Connector Pin Assignments
Pin
Signal
Mnemonic
1
Frame Ground
PGND
2
Transmit Data
TXD
3
Receive Data
RXD
4
Request to Send
RTS
5
Data Terminal Ready
DTR
6
Data Set Ready
DSR
7
Signal Ground
SGND
Figure A-3. Printer Port
o
o
A-2
Pin Assignment Connections
EIA
Circuit
Direction
AA
BA
Output
BB
Input
CA
Output
CD
Output
CC
Input
AB
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