NI MAX works but LabVIEW Instrument I/O VISA does not

[Jeong78]

Hello,

I am trying to communicate with SIM900 mainframe using RS232 connection in a VI but it is not working.

It is strange because the communication works when I use NI MAX or MATLAB Instrument Control Toolbox but it doesn't when using LabVIEW VISA functions such as VISA Open, VISA Write, or VISA Read, etc.

I confirmed that I use the correct serial settings (baud rage, data its, parity...), so it is hard to find out what might be the reason of this issue.

Could anyone help me resolve this?

Thank you,

Jeong

[Dennis_Knutson]

What are you using for a termination character? Are you using one of the example VIs where the string control is set for '\' Codes Display?