I have an iTengo3800 USB modem attached to an AnywhereUSB/14 and when I click the diagnostics tab in Windows device manager, then click query modem, it fails. However, when I use the iTengo SMS application, it is able to communicate and send messages. This tells me the configuration is correct but when I use query modem or Putty to attempt to connect to the COM port, it fails and I get an error message “the modem failed to respond”. I have verified there is nothing else using the COM port.
I have a feeling the iTengo SMS application is communicating through a different method than the “query modem” in Putty but I do not know what or how it is doing it. Has anyone else experienced this and was able to fix it?