SeaLevel DIO-16.PCI User Manual page 11

Direct Hardware Control
In systems where the user's program has direct access to the hardware (i.e. DOS) the table below gives the
mapping and functions that the DIO-16.PCI provides.
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.
Register Description
All ports are set to input after reset or power up.
Address
Base+0
Base+1
Base+2
Base+3
Base+4
Base+5
Base+6
Base+7
© Sealevel Systems, Inc. 8002 Manual | SL9021 10/2022
R = Read
R/W = Read or Write
Function Available
RD
R/W
RD = Read, RD/WR = Read or Write
Mode D7 D6
RD PAD7 PAD6
RD {0} {0}
RD/WR PCD7 PCD6
RD {0} {0}
RD {0} {0}
RD/WR IRQEN IRQST
RD {0} {0}
RD {0} {0}
Port Address Hex
A Base+0 Input Port (Opto Input)
B Base+1 Not Assigned
C Base+2 Output Port (Reed Relays)
D Base+3 Not Assigned
D5 D4 D3
PAD5 PAD4 PAD3
{0} {0} {0}
PCD5 PCD4 PCD3
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
Port Type
D2 D1 D0
PAD2 PAD1 PAD0
{0} {0} {0}
PCD2 PCD1 PCD0
{0} {0} {0}
{0} {0} {0}
{0} IRC1 IRC0
{0} {0} {0}
{0} {0} {0}
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