HP 2500C Series - Manual (Page 18)

Product Information 1-10
Specifications
Centronics Parallel Pinout Information
P IN N UMBER P IN ID D ESCRIPTION
1 Strobe 1 A low pulse causes the printer to read one byte of data
2 - 9 Data 0 - Date 7 These pins are the data lines. Data 0 is the least significant bit (LSB)
10 Acknowledge The printer sends a low pulse to indicate that it has accepted a byte of data and is
ready for more data.
11 Busy The printer sends a high logic level to indicate to the computer that it cannot
receive data due to data entry, a full buffer or error status.
12 Paper Error The printer sends a high logic level to indicate to the computer that it is out of
paper.
13 Ready The printer sends a high logic level to indicate to the computer that it is in an online
condition. The printer sends a low logic level to indicate that it is offline or that the
input buffer is full.
16 Signal Ground Signal interface ground.
17 Chassis Ground Chassis ground.
18 +5 V The printer outputs a +5 volt high logic level through a 2.2K ohm resistor.
19 - 30 Ground These pins are tied to signal ground
31 Reset/Input
Clear
1
A low pulse sent by the computer resets the printer and clears the print buffer. The
reset occurs on the trailing edge of the pulse
32 Error 1 The printer sends a low logic level to the computer to indicate that it is in an error
state.
1 Active low