Advantech ADAM-5511 Manual page 197

modem_initial
Syntax:
void modem_initial(void)
Description:
Sets modem to initial status. Due to the ADAM5511 system's con-
struction, the modem can only be connected to COM1. This resets the
modem to the initial state. The command has the same effect as
sending the ASCII command "atz" to the modem.
Parameter Description
None.
Return value:
None.
Example:
void main()
{
//you need to initialize COM1
modem_initial();
//put your modem function...
}
Remarks:
None.