User manual

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DIG_In_Port
• When the software reads output ports, the returned data is simply the
last data written, and the returned status is the badChanDirError
warning.
DIG_Out_Port
• Ports must be 8–15.
DIG_Line_Config
• Lines in ports 0–7 are always input lines and lines in ports 8–15 are
always output lines.
• There are eight lines per port numbered 0–7.
• You must set Direction to input for lines in ports 0–7 and to output
for lines in ports 8–15.
DIG_In_Line
• When the software reads output lines, the returned data is simply the
last data written, and the returned status is the
badDirOnSomeLinesError warning.
DIG_Out_Line
• Ports must be 8–15.
Set_DAQ_Device_Info
The VXI-DIO-128 supports an adjustable threshold for the input ports.
The logical 0-to-logical 1 transition can occur anywhere in the range of
-32.00 to +31.75 V in 250 mV steps. Set this threshold with the
Set_DAQ_Device_Info function as shown in the following example,
which sets the threshold of input port 3 to TTL level (1.5 V):
status = Set_DAQ_Device_Info(device,
ND_DIO128_SELECT_INPUT_PORT, 3);
status = Set_DAQ_Device_Info(device,
ND_DIO128_SET_PORT_THRESHOLD, 1500);
The first Set_DAQ_Device_Info call selects which input port threshold
to modify. The definitions for
ND_DIO128_SELECT_INPUT_PORT and
ND_DIO128_SET_PORT_THRESHOLD are in the NIDAQCNS include
file. The value for ND_DIO128_SET_PORT_THRESHOLD is in millivolts.
The input port thresholds of input ports 0–7 are automatically initialized