How do I change the NISCOPE_ATTR_CHANNEL_TERMINAL_CONFIGURATION attribute in my code using ni-scope

[Boilermaker99]

I am trying to setup my PCI-5922 to do a differential measurement, I need to modify the Terminal Configration property. I am using a wrapper to make calls to the device, there is function for this setting, how do I access this property in my code

[dansch]

Hi Boilermaker99,

The function prototype to set an attribute such as this is as follows (copied from High-Speed Digitizers Help):

C Function Prototype

ViStatus niScope_SetAttributeViInt32 (ViSession vi, ViConstString channelList, ViAttr attributeID, ViInt32 value);

Parameters

Name	Type	Description
vi	ViSession	The instrument handle you obtain from niScope_init that identifies a particular instrument session.
channelList	ViConstString	The channel to configure. For more information, refer to Channel String Syntax.
attributeID	ViAttr	The ID of an attribute.
value	ViInt32	The value that you want to set the attribute. Some values might not be valid depending on the current settings of the instrument session.

The specific attribute you are looking for is as follows:

NISCOPE_ATTR_CHANNEL_TERMINAL_CONFIGURATION

Datatype	Access	Applies to	Coercion	High Level Functions
ViInt32	R/W	Channel	None	N/A

Description

Specifies the terminal configuration for the channel.

Defined Values

NISCOPE_VAL_SINGLE_ENDED (0)

NISCOPE_VAL_UNBALANCED_DIFFERENTIAL (1)

NISCOPE_VAL_DIFFERENTIAL (2)

Thus, to setup the device to perform a differential measurement, you want to use something similar to the following function call:

ViStatus niScope_SetAttributeViInt32 (vi, "0", NISCOPE_ATTR_CHANNEL_TERMINAL_CONFIGURATION, NISCOPE_VAL_DIFFERENTIAL);

Additionally, I would like to point out that we provide a shipping example in C that shows how to configure the 5922 for differential mode. The example program can be found under Start » Programs » National Instruments » NI-SCOPE » Examples » C » Differential. It allows a user to type a number depending on which terminal configuration they want and then it sets the attribute based on that input. Hope this helps!

[Boilermaker99]

Thanks for the quick reply, I actually found that function in an example project about 15 minutes after I posted it

[dansch]

Ahh, good to hear. Cheers!