Description-
This function puts the modem in the command state & verbose mode. It first does this by sending “+++”. If the modem does not respond to “+++” it will toggle the DTR signal. If the modem still does not respond, it returns an error. This function can be used to determine if a modem is on a particular port.
Syntax-
stat = ModemAttention(port);
On Entry-
int port;
Port previously opened with InitializePort() or OpenComPort().
On Exit-
int stat;
0 If successful.
else
-1 If port was not initialized or modem does not respond.
See Also-
Dial()
ModemAnswerMode()
ModemConnect()
ModemGetCarrierSpeed()
ModemGetConnectSpeed()
ModemHangup()
ModemInit()
ModemModifyString()
Example-
#include "comm.h"
int port=0; int stat;
if ((stat = ModemAttention(port)) == -1)
{
printf("Error getting modem's attention.\n");
/* Take remedial action */ }