Extended I/O Ports. HP (Hewlett-Packard) NuDAQ PCI-9111HR, PCI-9111DG/HR

3.13 Extended I/O Ports

The PCI-9111 provides four extended input signals and four extended output signals. The signals are on the 37 pin connector. The extended output signals can be read back from the high nibble (4 MSBs) of the extended input port. Note that the output EDO pins on CN3 (37 pin connector) can be set as one of the following mode by software. The definition of the setting value can be found in header file of the library

ACL_PCI.H.

1. EDO_INPUT EDO mode 1

2. EDO_OUT_EDO EDO mode 2

3. EDO_OUT_CHN EDO mode 3

The output EDO value can be put on the EDO pins only when the EDO is set as mode 2. Under mode 1, the EDO output value will not be put on the

EDO pins, therefore the EDO signals are used as input only port. Under mode 3, the EDO pins presents the high nibble (4 MSBs) of the AD channel number no matter auto channel scan (ASCAN) bit is set or not.

Address: BASE + 4h

Attribute: write only

Data Format:

Bit 7

BASE+4h X

BASE+5h X

Address: BASE + 4h

6

X

X

5

X

X

4 3 2 1 0

X EDO3 EDO2 EDO1 EDO0

X X X X X

Attribute: read only

Data Format:

Bit 7 6 5 4 3 2 1 0

BASE+4h EDO3 EDO2 EDO1 EDO0 EDI3 EDI2 EDI1 EDI0

BASE+5h X X X X X X X X

3.14 Digital I/O register

There are 16 digital input channels and 16 digital output channels are provided by the PCI-9111. The address Base + 1C is used to access digital inputs and control digital outputs.

Address: BASE + 2h

Attribute: read only

Data Format:

20 • Registers Format