3860/80 User’s Manual
12-4
Serial Pin Assignments
A +5 volt supply is brought out on pins 22, 23, and 24. The maximum current available from
these three pins combined is 500 milliamps.
Pin Name
Circuit
Description
1 AA
Protective
ground
2
BA
Transmitted data from the printer
3
BB
Received data from the data source
4
CA
Request to send from the printer
5
CB
Clear to send from the data source
6
CC
Data set ready to receive data
7 AB
Signal
ground
8 Not
used
12,15,17
0V
+12V, -12V, +5V return
9
+12V
+12V volts, 250 milliamps (maximum)
10
-12V
-12 volts, 250 milliamps (maximum)
11,19
SCA
Secondary request to send
13
SCB
Secondary clear to send
14,16,18,21
Not
used
20
CD
Data terminal ready
22,23,24
+5V
+5 volts, 500 milliamps (maximum)
25
SCA
Secondary request to send