Port DIO of USB-1208FS-Plus

[Roger Lo]

Hi everyone,

There is a customer who bought the USB-1208FS-Plus.

The following source code of DIO is to use port A.

Github: https://github.com/mccdaq/uldaq/blob/master/examples/DOut.c

How can they modify it to use both port A and port B simultaneously? 

Thank you

[DAQman]

The USB-1208FS-Plus cannot combine ports A and B into one 16-bit port.  Instead, you must control them one at a time. 

Port configuration is simple. To set both to be output, use the ulDConfigPort function.

err = ulDConfigPort(daqDeviceHandle, FIRSTPORTA, DD_OUTPUT);

err = ulDConfigPort(daqDeviceHandle, FIRSTPORTB, DD_OUTPUT);

Use ulDOut to update each port as follows:

err = ulDOut(daqDeviceHandle, FIRSTPORTA, data);

err = ulDOut(daqDeviceHandle, FIRSTPORTB, data);

[Roger Lo]

On 6/13/2024 at 11:37 PM, JRys said:

The USB-1208FS-Plus cannot combine ports A and B into one 16-bit port.  Instead, you must control them one at a time. 

Port configuration is simple. To set both to be output, use the ulDConfigPort function.

err = ulDConfigPort(daqDeviceHandle, FIRSTPORTA, DD_OUTPUT);

err = ulDConfigPort(daqDeviceHandle, FIRSTPORTB, DD_OUTPUT);

Use ulDOut to update each port as follows:

err = ulDOut(daqDeviceHandle, FIRSTPORTA, data);

err = ulDOut(daqDeviceHandle, FIRSTPORTB, data);

Hi JRys,

Thanks for the reply.

Now, the customer has another question:

 

For the coding, could you please help to explain the purposes of these two program code?

1.

err = getDioInfoFirstSupportedPortType(daqDeviceHandle, &port_A, portTypeStr);

=> The customer has marked this code to be the annotation, the program still executes fine. They would like to know how and what it affects.

2.

 err = getDioInfoFirstSupportedPortIoType(daqDeviceHandle, &portIoType, portIoTypeStr);

=> This code seems to get the type of Port A. The customer would like to know how to get the type of Port B. Is there any sample code of it?

 

Thank you so much

[DAQman]

The functions interrogate the device to determine the number of digital ports and their types. You don't need them if you know the USB-1208FS-PLUS has two 8-bit ports: FIRSTPORTA and FIRSTPORTB. Use UL Help to get the details—there is probably a shortcut to it in the Windows program list under Measurement Computing.  In UL Help, search on the device name to get the page that lists the functions and enumeration. The picture below shows the Digital I/O section on the USB-1208FS-Plus and USB-1408FS-Plus page.

[Roger Lo]

On 6/18/2024 at 11:52 PM, JRys said:

The functions interrogate the device to determine the number of digital ports and their types. You don't need them if you know the USB-1208FS-PLUS has two 8-bit ports: FIRSTPORTA and FIRSTPORTB. Use UL Help to get the details—there is probably a shortcut to it in the Windows program list under Measurement Computing.  In UL Help, search on the device name to get the page that lists the functions and enumeration. The picture below shows the Digital I/O section on the USB-1208FS-Plus and USB-1408FS-Plus page.

Hi JRys,

Thanks for the information.

Thank you

[Roger Lo]

On 6/20/2024 at 12:20 AM, Roger Lo said:

Hi JRys,

Thanks for the information.

Thank you

On 6/18/2024 at 11:52 PM, JRys said:

The functions interrogate the device to determine the number of digital ports and their types. You don't need them if you know the USB-1208FS-PLUS has two 8-bit ports: FIRSTPORTA and FIRSTPORTB. Use UL Help to get the details—there is probably a shortcut to it in the Windows program list under Measurement Computing.  In UL Help, search on the device name to get the page that lists the functions and enumeration. The picture below shows the Digital I/O section on the USB-1208FS-Plus and USB-1408FS-Plus page.

 

Hi JRys,

The customer would like to change the analog input mode from single-ended to differential mode.

I found the UL library only shows there are two modes, but it didn't mention any function of switching mode.

Could you please help to provide more detailed information about it?

and if possible, could you please also provide us with a sample code of it for the customer's reference?

Thank you so much

[DAQman]

The input mode is a parameter of the ulAIn and ulAInScan functions

use AI_SINGLE_ENDED for single-ended inputs; use AI_DIFFERENTIAL for differential inputs.

Please take a look at the UL help for Linux for additional information.

https://files.digilent.com/manuals/UL-Linux/c/group___analog_input.html