HP 2500c Service Manual - Page 18
Centronics Parallel Pinout Information
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Specifications Centronics Parallel Pinout Information PIN NUMBER PIN ID DESCRIPTION 1 Strobe1 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 A low pulse sent by the computer resets the printer and clears the print buffer. The Clear1 reset occurs on the trailing edge of the pulse 32 Error1 The printer sends a low logic level to the computer to indicate that it is in an error state. 1 Active low 1-10 Product Information