About Bluetooth communicaton on iPAQ h5550

Hi, dear all:
  I just made a test about the communication between PDA and Barcode scanner over Bluetooth. And it works out very well.
  I could get the datas from virtual com port on PDA. But there is one thing I don't understand and feel wried a bit.
  'Cause while I opened and got datas from Virtual COM Port 5(the index is 4 in Labview program), I couldn't get anything.
  But when I changed to open Virtual COM Port 8(the index is 7 in Labview program), I could get datas from it successfully.
  And when I went into the configuration of Bluetooth on PDA, it displays "Inbound COM Port: 5, Outbound COM Port: 8". I think my English
  is not a problem for understanding this word. Inbound COM is for the place where the datas write into PDA from my Barcode scanner(or 
  other Bluetooth devices) and "Outbound COM" is for the datas write out through it. Right?
  Hope there is someone who can answer me for this question. Thanks a lot.
Andy

Andy,
I believe you are referring to this link:    
http://zone.ni.com/devzone/conceptd.nsf/webmain/5EB9312A6470F16A86256E7500726F15
The main subject of this document is about using the LV specific
Bluetooth functions (Open Connection, Write, Read, etc.). These
functions are indeed similar to TCP functions, but they act at a lower
level. When using virtual serial ports, you don't use specific
Bluetooth
functions, you simply open a COM via the usual VISA function (on a PC)
or Serial Communication functions (on a PDA). In this case, you are
exploiting a service provided by the OS that is at a higher level than
a pure BT connection.
What is relevant in your case is in the last paragraph of this document, Bluetooth Virtual Serial Port, where you can read:
"You can open the serial
channel as an outbound (client) port or as an inbound (server) port.
When you open the port as an outbound (client) port, the driver prompts
you to select a Bluetooth device (server) to connect to. When you open
the port as an inbound (server) port, the driver waits to receive a
connection request from the client. Bluetooth serial port is based on
RFCOMM, which is different from a physical serial port. RFCOMM requires
roles of a server and a client when establishing Bluetooth serial
connection"
Paolo
Paolo
LV 7.0, 7.1, 8.0.1, 2011

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