Executing AT commands

This subVI reads from the keyboard AT command and forwards the command to the GSM modem. Figure 1 shows the block diagram of the subVI.

Fig. 1 Execution of AT command

After sending AT command to the modem the program reads the modem answer and displays it on the screen. This subVI enables easy testing the AT commands, so it is not necessary to use Hyper Terminal or similar programs. Since the answer depends on the GSM modem executed commands, program does not test the correctness of the received message,  only displays it on the screen.