rs232

[123ab]

When I run basic write and read.vi , I use a virtual com port for my PC doesn't have it. The program can run without any error,but the string indicator can't show what I write.  I want to know why ,thanks !

[Dennis_Knutson]

Its not supposed to. Are you trying to create an echo? You have the command in the string control so why have it twice?

[123ab]

I  want to echo what I write in the first string control, for example "abcd",and I expect to recieve "abcd" in the string indicator below.

[Dennis_Knutson]

Then just use the concatenate string function.