How to end a CMD command?

Question

cmd/bat

How to terminate command when sending AT commands to modem using plink? You can start typing a new one only after pressing Ctrl + C. I tried with a bat file - the result is the same. The following commands after "echo at......." are not executed. It is impossible to send an AT command directly without plink - CMD does not see the modem (usb2com). But through HypyrTerm or PuTty everything is ok.

Answer 1

It may be worth executing in a separate thread with its command

start "echo at+csq | plink -serial com9"
timeout 10
taskkill /im plink.exe