HP NuDAQ I-9111DG/HR manual Address Base + 4h Attribute write only Data Format Bit

3.13Extended 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	6	5	4	3		2		1	0
BASE+4h	X	X	X	X	EDO3		EDO2		EDO1	EDO0
BASE+5h	X	X	X	X	X			X	X	X
Address: BASE + 4h
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

3.14Digital 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