I've created a VBA class for Excel, cLabJack.cls (attached) and most of it works. Problem is I can't read the digital inputs:
lngErrorcode = eGet(lngHandle, LJ_ioGET_DIGITAL_PORT, i, pFIO(i).Value, 0)
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I've created a VBA class for Excel, cLabJack.cls (attached) and most of it works. Problem is I can't read the digital inputs:
lngErrorcode = eGet(lngHandle, LJ_ioGET_DIGITAL_PORT, i, pFIO(i).Value, 0)
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With that call you are not reading anything. When using the IOType LJ_ioGET_DIGITAL_PORT, the Channel parameter specifies the starting digital input line and the x1 parameter specifies how many bits (digital lines) to read. You have those set to i and 0. Change your last parameter from 0 to how many bits you want to read. Judging from your code, it looks like you want it set to 1. Alternatively, if you are only reading one digital I/O line you can use the IOType LJ_ioGET_DIGITAL_BIT instead and pass 0 for x1 (it is not used).
For UD library digital I/O documentation, look here:
https://labjack.com/support/datasheets/u3/high-level-driver/example-pseu...
Thanks, but neither of those work.
BTW: I had already been using LJ_ioGET_DIGITAL_BIT and switching to PORT was just a flailing attempt on my part.
BBTW: The documentation you link to has no reference to "eGet"
For testing, simplify your code to something similar to this and check that the returned state reading looks correct:
lngErrorcode = eGet(lngHandle, LJ_ioGET_DIGITAL_BIT, 4, state, 0)
Confirm that if you have FIO4 connected to GND the state reads 0, and if FIO4 is has no connection it reads 1.
The documentation I pointed to was digital I/O documentation. eGet is basically AddRequest/Go/GetRequest in one call and shares the same parameters. Functions are documented here:
https://labjack.com/support/datasheets/u3/high-level-driver/function-ref...
If that doesn't help, please describe the error you are getting or how things are not working.
That seems to have done the trick - kinda.
I had created a class for the DIO with members .Type and .Value (VBA double). When I pass .Value in the DLL call, it doesn't work, when I use a local variable and assign it to .Value, it works.
Maybe it's a bug in VBA related to ByRef arguments of class members... I suppose I can try using OpenOffice.
I read through the documentation several times, how do I read the configuration? How do I read if a port is AIN, DI or DO?
Actually, I think I have the answer, namely:
lngErrorcode = eGet(lngHandle, LJ_ioGET_DIGITAL_BIT_DIR, i, state, 0)
But what I don't understand is the "U3 Test Panel" shows FIO6/7 as inputs, the above code shows them as output (they're open circuit)
When the U3 test panel opens, it changes FIO4-7, EIO and CIO to digital inputs. In your code I see a "Property Let FIO" that sets lines to digital outputs. I'm guessing that is being called before your LJ_ioGET_DIGITAL_BIT_DIR call to make the direction output.
It looks like you figured out reading the direction. LJ_ioGET_DIGITAL_PORT_DIR will also read one or more digital directions.
To check if a line is a analog input (1 = analog input, 0 = digital I/O), use the IOTypes LJ_ioGET_ANALOG_ENABLE_BIT or LJ_ioGET_ANALOG_ENABLE_PORT:
https://labjack.com/support/datasheets/u3/high-level-driver/example-pseu...