USB-1208FS: Read digital ports. This command reads the current state of
the DIO ports. The return value will be the value seen at the port pins.
data(1) is the 8-bit value read from port A.
data(2) is the 8-bit value read from port B.
DeviceIndex” is a small integer, the array index specifying which HID
device in the array returned by PsychHID(‘Devices’) is interface 0
of the desired USB-1208FS box.

USB-1608FS: There is only one port, so only one meaningful return value.
First argument is optional if you have only one DAQ device, but code will
run faster if DeviceIndex is specified. Second argument is optional; if
it is not specified, software will attempt to determine if it should be 1
or 2 based on the type of device. Specifying it explicitly speeds up
code about 1 to 2 milliseconds per call on a dual core MacI with 2.67
GHz processors. – mpr

USB-1024LS: Has three ports, numbered: 1 = port A, 4 = port B,
10 = port C (the sum of: 8 = portC low, 2 = portC high). Maybe you’ll
need to read port C separately in two calls for low- and high- part.
The card is verified to work well with port C for input, not addressing
the high and low port C separately, but the whole port C at once.

See also Daq, DaqFunctions, DaqPins, DaqTest, PsychHIDTest.
DaqDeviceIndex, DaqDOut, DaqAIn, DaqAOut, DaqAInScan,DaqAOutScan.

4/15/05 dgp Wrote it.
12/18/07 mpr added second argument and made first optional
1/11/08 mpr swept through trying to improve consistency across daq
5/22/08 mk Add (untested!) support for USB-1024LS box.
5/23/08 mk Add caching for HID device list.
07/31/16 mk Remove experimental note about 1024LS. It’s tested and known to work.

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