Detect connected lines

I'm trying to understand the best way to do something.  It is led in TestStand using Switch Executive.

I have a line of 213 column x 4 2-wire Matrix.  4 rows connect up to 4-channel PXI-5105.  I've defined logical names for each column to go to each of r0, r1, r2 and r3.  Users will choose up to 4 in the columns of 213 to route to the 5105 for sampling. If a user connects 4 channels and then decide they want to try a different channel, I wish I could disconnect only 1 channel, they no longer want and connected to the new channel.  I've defined groups of road called All_To_R0, All_To_R1, etc., with the idea that if the user wants to exchange the R0 channel then I would call an offset on the All_To_R0 who will ensure that what it is related to R0 disconnects and then I plug the new channel.

However, this generates errors saying roads do not exist, which makes sense, I guess.  I could just call a DisconnectAll and let my users to follow with routes they want to connect.  I could follow this in my driver code but / puts an end to demolitions would stop me to manage accurately the State of the switch.  Is there an 'integrated' way to do?

To know if a road is connected or not, you can call FindRoute on a NISE session. It's a way to do it, but you need to understand what are the endpoints of a route. You can use the API configuration NISE to understand what roads are part of a group of lines, and what are the endpoints for a given road, if you are not comfortable to hardcode these channel names in your program.

Another way to determine if the road is connected or not, especially if your end goal is to disconnect, is to call Disconnect on this road and ignore the error indicating that the road did not exist. (You can always capture other errors, however).

Tags: NI Products

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