Removing echo

This subVI removes echo. Upon execution of this command, the modem does not return characters received from the computer. Figure 1 shows the block diagram of the remove echo subVI.

Fig. 1 Removing echo

If the answer of GSM modem is <CR> <LF> OK <CR> <LF> subVI returns the correct status. Otherwise, the error flag is set and the next subvIs that communicate with the GSM modem will not be executed. In this way there is proof that each sent command is correctly executed.

Message format is: ATE0 <CR>