MSComm OnComm event is fired occasionally

[Tornado1981]

I'm trying to read incoming SMS

RThreshold value is set to 1

The Meassage Storage Area is "SM"

However, OnComm event is fired only when I send a command (e.g MSComm1.Output = "AT" & vcCrLf).. OnComm is fired when "OK" is returned

Why OnComm event is not fired when an incoming SMS is received?

Thank you.​

 

[Yongle]

Have a look an earlier MrExcel thread which seems to address your exact problem vba-oncomm-event-does-not-trigger
and receive data from com-port