Impulse 8004 - Manual (Page 11)

© Sealevel Systems, Inc. - 9 - DIO-32.PCI User Manual
DB-78 Female Pin Assignments (Card Edge Connector)
Bit Port A Pins Port B Pins Port C Pins Port D Pins
0 55,74 47,66 2,20 10,28
1 54,73 46,65 3,21 11,29
2 53,72 45,64 4,22 12,30
3 52,71 44,63 5,23 13,31
4 51,70 43,62 6,24 14,32
5 50,69 42,61 7,25 15,33
6 49,68 41,60 8,26 16,34
7 48,67 40,59 9,27 17,35
GND 39,57,58 18,36,37
+12V 38 1
+5V 56 19
Direct Hardware Control
In systems where the users program has direct access to the hardware (DOS) the
tables that follow give the mapping and functions that the DIO-32.PCI provides.
Function Available Port Address Hex Port Type
RD A Base + 0
RD B Base + 1
Optically Isolated Input Port
RD/WR C Base + 2
RD/WR D Base + 3
Reed Relay Output Port
RD = Read, RD/WR = Read or Write
Reading the Inputs
The inputs are active Low. If no voltage is applied across one of the differential
inputs it returns a one on that bit. If an AC or DC voltage is applied it returns a zero
on that bit.
Reading the Outputs
The relay ports return the ones complement of the value that is currently being used
to drive the relays.
Writing the Outputs
The output ports are the only ports that can be written. The relays on a standard
DIO-32.PCI are normally open. To close a relay a one must be written to the
appropriate bit.