Appendix a – porter pin outs, Porter installation and operations manual 31, Parallel model – Rose Electronics Porter User Manual
Page 35
PORTER INSTALLATION AND OPERATIONS MANUAL
31
Appendix A – Porter Pin outs
Serial model
Pin Signal Name
Abbrv.
I/O
Description
2
Transmit data
TXD
Output
Serial data from port
3
Receive data
RXD
Input
Serial data to port
4
Request to send
RTS
Output
Always high
6
Data set ready
DSR
Input
Low inhibits TXD data*
7
Signal ground
GND
Common
Ground reference
20
Data term. ready
DTR
output
Low should inhibit RXD
* Pin 6 has an internal pull-up to set it high (ready) when no signal is connected and
when no hardware flow control is required.
Parallel Model
Pin
Signal
Port 0
Port 1-8
Description
1
STROBE
Input
Output
Data transfer when pulsed low
2
Data 0
Input
Output
Data LSB
3
Data 1
Input
Output
.
4
Data 2
Input
Output
.
5
Data 3
Input
Output
.
6
Data 4
Input
Output
.
7
Data 5
Input
Output
.
8
Data 6
Input
Output
.
9
Data 7
Input
Output
Data MSB
10
ACK
Output
Input
Pulsed low for next data transfer
11
BUSY
Output
Input
When high inhibits flow of data
12
PE
Output
Input
When high printer is out of paper
13
SELECT
Output
Input
General purpose signal
14
AF
Input
Output
General purpose signal
16
Ground
Common
18
+5 volts
19-30
Ground
Common
31
Init
Output
Input
When pulsed low resets printer
32
ERROR
Output
Input
When high printer has an error
33
Ground
34
Spare
Input
Output
General purpose signal
36
SLCTIN
Input
Output
General purpose signal
General purpose signals may vary in various equipment or not be present.