Black Box PC118C-R2 manual Appendix C Parallel-Port Pinouts

HPIIISi TWINAX CARD

Appendix C: Parallel-Port Pinouts

Table C-1 shows the pinouts for the parallel printer connector on the HPIIISi Twinax Card.

DIRECTION is the direction of signal flow from the interface.

RETURN PIN is the twisted-pair return, to be connected at signal ground level. For the interface wiring, be sure to use twisted-pair cable for each signal and to complete the connection on the return side. The cable should be shielded and connected to the chassis of the host computer and printer.

All interface conditions are based on TTL levels. Both the rise and the fall times of each signal must be less than 0.2 µsec.

Data transfer is carried out by observing the ACKNLG or BUSY signals. Data transfer to the printer occurs only after receipt of the ACKNLG signal or when the BUSY signal is LOW.

Data must be present a minimum of 0.5 µsec before and after a minimum of 0.5 µsec STROBE pulse. BUSY goes high before the end of the STROBE signal and remains high until the end of an ACKNLG pulse of 0.5 µsec.

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