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see:http://forum.lazarus.freepascal.org/index.php?topic=32632.0

As a part of the patch, anew property was added to the TBlockSerial class in synaser.pas,added as NonBlock. The NonBlock property isfor Unix users (Linux and OS-X included).
When NonBlock is True, the call to the FpOpen method in TBlockSerial.Connect will not blockwhen an of CTS, DSR, or Carrier are not active.

This library is Free software; you can rediStribute it and/or modify itunder the terms of the GNU Library General Public License as published bythe Free Software Foundation; either version 2 of the License, or (at youroption) any later version.

This program is diStributed in the hope that it will be useful, but WITHOUTANY WARRANTY; withOut even the implied warranty of MERCHANTABILITY orFITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public Licensefor more details.

You should have received a Copy of the GNU Library General Public Licensealong with This library; if not, Write to the Free Software Foundation,Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. }

Based on :

• SdpoSerial v0.1.4CopyRight (C) 2006-2010 Paulo Costapaco@fe.up.pt

• Synaser library by Lukas Gebauer

• TcomPort component

####Features :

• changed baudrate values.
• changed stop bits new value : 1.5
• new event : onstatus
• new propertyFRcvLineCRLF : if this property is true, you use RecvStringin place of RecvPacket when you read data from the port.
• new procedureShowSetupDialog to open a port settings form :
• the device combobox contain the enumerated ports.
• new procedure to enumerate real serial port on linux ( in synaser).

Demo : a simulator of serial port gps + serial port receiver :you can send NMEA frames ( GGA GLL RMC) to the opened serial port(start gps simulator). You can change speed and heading.In the memo you can see what is received from the opened serial port.In the status bar you can see the status events.

tested with windows 7 and Ubuntu 12.04

if you haven't serial ports in your PC you can use virtual ports :

• 1 - WINDOWSTo simulate a paired serial ports on windows : com0comex :
• 2 - LinuxTo simulate a paired serial ports on linux : socatex : socat -d -d PTY: PTY:

To connect to a bluetooth GPS on Linuxecho connection to a bluetooth GPS(/dev/rfcomm0)

sudo rfcomm bind 0 xx:xx:xx:xx:xx:xx 1

Sorry for my poor english but it isn't my natural language.