Re: Need to detect continuity between 2 terminals

[jmlynesjr]

in reply to Need to detect continuity between 2 terminals

This is a pretty common thing to do. You should be able to detect RTS/CTS or DCD assuming as martell said the handshaking signals are supported by Device::SerialPort.

Update1: Looks like both modem control(DCD) and handshaking(RTS/CTS) are both supported.

if ($PortObj->can_wait_modemlines) {
      $rc = $PortObj->wait_modemlines( MS_RLSD_ON );
      if (!$rc) { print "carrier detect changed\n"; }
  }

  if ($PortObj->can_modemlines) {
     $ModemStatus = $PortObj->modemlines;
     if ($ModemStatus & $PortObj->MS_RLSD_ON) { print "carrier detecte
+d\n"; }
  }

# controlling outputs from the port
  $PortObj->dtr_active(T);              # sends outputs direct to hard
+ware
  $PortObj->rts_active(Yes);            # return status of ioctl call
                                        # return undef on failure

James

[redss]

Yeah that code example is just what I was looking for.

I did forget to mention that this is for Win32.

Unfortunately, Device::SerialPort is not available for Windows, and the Win32::SerialPort module doesnt seem to be available in the Activestate ppm repository.

Which module should I be using?

[jmlynesjr]

Win32::SerialPort and Win32API::CommPort are both listed on CPAN. Maybe you can install them from there. I am not familiar with Active state.

James