Technical information

Opto DIO48 OPTO DIO Reference
BUS Jumpers.
The top two jumpers, are the BUS jumpers, determine
which pulse is gated onto the PC expansion BUS slots interrupt
and reset lines. To actually drive the PC’s irq and reset lines the
lines must be gated on, under program control, by setting bit 0
for the Reset and bit 1 for the Irq line in the watchdog register.
OUT Jumpers.
The lower four jumpers are the OUT jumpers determining
which signal may be output on the PA10 line. To actually output
this signal the PA10 out jumper must also be set.
OUT Via PA10 Jumpers.
The four pin jumper block at the upper left of the card
determines which signal is output, via an opto isolator, on the
PA10 line. Either the PA10 line or the signal selected by the
Watch Dog OUT jumper may be routed to the edge connector.
Note when using the INVERTING ULN2804 SINK DRIVERS
the Watch Dog signal is also inverted by these drivers, thus the
RESHI/LO and GOODHI/LO legends are the inverted.
Figure 2-9. Watchdog Output Select.________________________________
FACTORY SET___________
.. PORT A1 Bit 0 Output. Via Pin 34 of 50D, pin 1 of 50IDC.
. . WatchDog Out Signal Output. Via Pin 34 of 50D, pin1 of 50IDC.
.... WatchDog Out Signal Output. Attach flylead for use inside PC
Pin 3 = Watch dog signal NOT OPTICALLY ISOLATED
34 Pin 4 = PC ground NOT OPTICALLY ISOLATED
Chapter 2 Page 23