User's Guide
Interfaces C-13
Table C-2. Serial Pin Assignments––continued
Pin
Signal
Source
Printer Usage
8
DCD
Computer
Ignored
9 - 10
Not connected
11
DTR
Printer
Same as signal on pin 20, except
polarity of signal is user-selectable
(signal present only when JP1 jumper
on logic board is on pins 2 and 3)
12 - 19
Not connected
20
DTR
Printer
Goes low when printer buffer is
almost full; returns high when buffer
can hold more data (when DTR hand-
shake is turned off, this signal remains
high at all times)
21 - 24
Not connected
25
DTR–
Printer
Same as signal on pin 20, except
polarity of signal is user-selectable
(signal present only when JP1 jumper
on logic board is on pins 1 and 3)
User's Guide
Interfaces C-13
Table C-2. Serial Pin Assignments––continued
Pin
Signal
Source
Printer Usage
8
DCD
Computer
Ignored
9 - 10
Not connected
11
DTR
Printer
Same as signal on pin 20, except
polarity of signal is user-selectable
(signal present only when JP1 jumper
on logic board is on pins 2 and 3)
12 - 19
Not connected
20
DTR
Printer
Goes low when printer buffer is
almost full; returns high when buffer
can hold more data (when DTR hand-
shake is turned off, this signal remains
high at all times)
21 - 24
Not connected
25
DTR–
Printer
Same as signal on pin 20, except
polarity of signal is user-selectable
(signal present only when JP1 jumper
on logic board is on pins 1 and 3)
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