SeaLevel DIO-32.PCIe User Manual page 16

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.PCIe provides.
Function Available
RD
RD
RD/WR
RD/WR
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.PCIe are normally
open. To close a relay a one must be written to the appropriate bit.
Register Description
All ports are set to input after reset or power up.
Address
Base+0 Input Port A
Base+1 Input Port B
Base+2 Output Port C
Base+3 Output Port D
© Sealevel Systems, Inc. 8004e Manual | SL9207 12/2022
Port Address Hex
A Base + 0
B Base + 1
C Base + 2
D Base + 3
RD = Read, RD/WR = Read or Write
Mode D7 D6
RD PAD7 PAD6
RD PBD7 PBD6
RD/WR PCD7 PCD6
RD/WR PDD7 PDD6
Port Type
Optically Isolated Input Port
Reed Relay Output Port
D5 D4 D3 D2
PAD5 PAD4 PAD3 PAD2
PBD5 PBD4 PBD3 PBD2
PCD5 PCD4 PCD3 PCD2
PDD5 PDD4 PDD3 PDD2
D1 D0
PAD1 PAD0
PBD1 PBD0
PCD1 PCD0
PDD1 PDD0
16