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Appendix C: Interface Pin Outs / Annexe C: Broches du connecteur interface
Anhang C: Schnittstelleninformationen / Appendice C: Uscite terminali interfaccia
Optional Serial Interface
Pin
Name
Function
1
GND
Printer chassis ground
2
TXD
Data from printer
3
RXD
Data to printer
4
RTS
Always space
5
CTS
Space when computer is ready to send data. Printer ignores this signal.
6
Not used.
7
GND
Signal ground
8 - 10
Not used.
11
RCH
Printer sets line to space when ready to receive data. Same signal as Pin
20.
12 - 19
Not used.
20
DTR
Printer sets line to space when ready to receive data.
21 - 25
Not used.
Parallel Interface
Pin
Name
Function
1
STROBE
Goes low for
≥
0.5
µ
s when active.
2
DATA0
These signals represent information for the 1st through 8th bit of parallel
data, respectively. Each signal is HIGH when data is logical 1, and LOW
when logical 0.
3
DATA1
4
DATA2
5
DATA3
6
DATA4
7
DATA5
8
DATA6
9
DATA7
10
ACK
10
µ
s low to acknowledge receipt of data.
11
BUSY
Printer sets line low when ready to receive data.
12
PAPER
High when paper runs out. .
13
SELECT
High when printer is on-line.
14 - 15
Not used.
16
SIGNAL GND
Signal ground
17
CHASSIS
Chassis ground (isolated from signal ground)
18
+5V
+5V DC output from printer
19 - 30
GND
Twisted pair ground return
31
RESET
Printer is reset when this signal goes low.
32
ERROR
Low when printing cannot continue due to error.
33
EXT GND
External ground
34 - 36
Not used.
