how can i verify the CD serial line?

[lucia]

I need to detect the signal connection with a modem. how can I access to the carrier detect line?

[Michael_N.]

Hello Lucia,

Assuming that you are using LabVIEW, you can follow the steps in the Knowledge Base below. You will need NI-VISA, which you can download from our website if you do not already have it installed.

Can LabVIEW Test if My Modem Is Connected? 

VISA Download Webpage

Regards,

Mike N.
Applications Engineer
National Instruments