This page is a part of VPortPro online Help Manual.
VPortPro-client with Com Port Control by Labtam.
VPortPro makes serial (RS232) data from your PC available on TCP/IP-based networks and makes TCP/IP data available on virtual serial ports of your PC. Visit Home of VPortPro for more information.

The "[VPORTPRO]" Section of the ini-file

The "[VPORTPRO]" section of the ini-file may have the following entry lines you can customize for particular needs and applications.


Data Carrier Detect (DCD) - name of the serial communication signal (defined by the RS-232-C specification) that indicates the presence or absence of a basic carrier signal from a (remote) DCE (Data Communications Equipment). With the help of the DCD line DCE reports to DTE (Data Terminal Equipment) that the connection with the remote device is established and ready for transmission.

The L value in this entry line specifies the way the software will interpret the DCD "state" of virtual serial ports (e.g., to ensure that client and server parts are properly connected to each other across the network by virtual "serial cable" when you plug in a serial device).

  • DCD=0 - DCD is constantly Off
  • DCD=1 - DCD is constantly On (Default)
  • DCD=2 - DCD is controlled by the DTR signal (as in NULL Modem Cable).
    This is applicable only for the RFC2217 protocol type (not for RAW).
  • DCD=4 - DCD will be turned On when client and server connects to each other,
    and DCD will be turned Off when client and server disconnects from each other.

Note that all these values are applicable for both the RFC2217 and RAW protocol types except for DCD=2.


The SYNC=1 entry line specifies the "SYNC" data transfer mode for all virtual serial ports. In this mode, data messages from/to a (virtual) serial device (and serial port) are transferred unbroken in network packets.

With SYNC=0, the "ASYNC" data transfer mode will be effective. In this mode, serial data messages may be broken into more than one network packets (i.e., into "sub-messages").

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