HP 9030 CE Handbook page 51

9030/40
Peripherals 7-5
To configure the GPIO card:
1. Install jumpers in WI, W2, and W3, according to whether 5-volt or 12-volt logic levels are to
be used.
2. Set the card's switches for proper operation.
3.
If
necessary, increase the delays on the card as follows:
Two one-shots (EI5) on the GPIO card generate the write delay and the internal handshake
delay. The write delay one-shot provides approximately 100 nsec for the output data to
settle. When extra-long cables are used, or when the peripheral device requires additional
settling time for the data, the delay can be increased by adding a capacitor between pins 1
and 4 of the socket at E16
The formula for selecting the capacitor value is:
C
=
(T-100)/1.5
where
C = additional capacitance (in pf)
T = total time delay required in nsec
The internal delay one-shot provides a delay of approximately 3 usec between the assertion
of PCNTL and the assertion of FLAG. The delay can be increased by adding a capacitor
between pins 5 and 8 of the socket at E16.
The formula for the value of the capacitor is:
C
=
(T-3000)/3
where
C
=
additional capacitance (in pf)
T
=
total time delay required (in nsec)
27112A
GPIO
Interface
Std. Cable, Sm
Pin & Socket
Connector
(27112-60006
or
27112·63002)
(Included)
SO-Pln Female
Connector
HP 27112A GPIO Interface Cabling
Unterminated