Direct hardware control, Reading the outputs, Writing the outputs – Impulse 8003e User Manual
Page 15: Register description
©Sealevel Systems, Inc.
8003e Manual
15
SL9235 3/2013
In systems where the users program has direct access to the hardware (DOS) the tables that follow give the
mapping and functions that the REL-16.PCIe provides.
Function Available
Port
Address Hex Port Type
RD/WR
A
Base + 2
RD/WR
B
Base + 3
Reed Relay Output Port
RD/WR = Read or Write
The relay ports return the ones complement of the value that is currently being used to drive the relays.
The output ports are the only ports that can be written. The relays on a standard REL-16.PCIe are normally
open. To close a relay a one must be written to the appropriate bit.
Address
Mode
D7
D6
D5
D4
D3
D2
D1
D0
Base+2
Output Port A
RD/WR PCD7
PCD6 PCD5 PCD4
PCD3
PCD2
PCD1
PCD0
Base+3
Output Port B
RD/WR PDD7
PDD6 PDD5 PDD4
PDD3
PDD2
PDD1
PDD0
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