Technical information

OPTO OUT48 OPTO DIO Reference
Source Driver Output Connection.______________________________
UDN2984 Drivers.
The UDN2984 chips are high voltage, high current SOURCE
drivers, output voltage range 35 to 80 Volts, these could be
directly replaced by UDN2981 drivers for output voltages in the
range 5 to 50 Volts. Whilst the 2984/81 drivers have built in
output transient suppression diodes, extra diodes are provided on
the card for extra protection. The socketed 10k resistor networks
RN3, 5, 13 and RN7, 9 and 11 should be left installed.
For normal operation, 2984s installed, sockets U26, U28, U30,
U35, U37 and U39 hold non inverting buffers chips 74LS541.
For inverse operation, inverting buffers chips 74LS540 should be
installed in sockets U26, U28, U30, U35, U37 and U39.
Sink Driver Output Connection.____________________________
ULN2804 Drivers.
The ULN2804 chips are high voltage, high current open
collector NPN DARLINGTON drivers, output voltage range to
50 Volts. These could be directly replaced by ULN2824 chips
for output voltages up to 95 Volts. When changing from 2984 to
2804 drivers note than the 2804 are INVERTING drivers, thus
to produce the same logical output from a bit pattern written to
the output port the 74LS541 chips would have to be replaced by
the inverting 74LS540 chips. Remember to remove the socketed
10k resistor networks RN3, 5, 7, 9, 11 and 13.
For inverse operation, the non inverting buffers chips 74LS541
should be placed in sockets U26, U28, U30, U35, U37 and U39.
Interrupt Selection._________________
The Opto OUT48 card can produce interrupts from low to
high transitions on of the Watch Dog timeout line.
The IRQ must be ENABLED in software AND the IRQ jumper
must both be set before any IRQ requests are generated. The
users program sets the IRQ enable bits in the watch dog register
Chapter 4 Page 43