Null-modem cable is basically used for communication
of two RS-232 "DTE" devices with each other. To create
null-modem connection between the devices you need to
use two computers or two serial ports of a single
computer connected with null-modem cable. The both
methods described above are expensive and difficult
because of many reasons. The most reliable way to
create null-modem connection is using of virtual
serial ports emulated by virtual serial port driver
and null-modem cable.
Why do you need to emulate serial ports and null-modem
connection? There are few main reasons to do it.
Firstly, you don’t need to have two computers
connected with real null-modem cable. Secondly,
there’s no need in a single PC with several free
serial ports and additional multi serial port devices
which are expensive and bulky. To emulate null-modem
connection Virtual Null Modem can be effectively used.
The program emulates one or more couples of RS-232
serial ports connected via virtual null-modem cable.
It is possible to create the unlimited couples of
virtual serial ports on a single PC and connect them
in any sequence using virtual null-modem cable.
Usually you need to use virtual null-modem when you
have two applications to be connected via serial
ports. In contrast to ordinary connection you do not
need any additional hardware (computers, physical
serial ports, cables) to perform it. Virtual null-
modem allows user emulate virtual null modem
connection and run the two applications simultaneously
on the same computer. Moreover, it is possible to
emulate real-world situations by adding some errors to
the data exchange which may occur during the physical
null-modem connection. Owing to its features set
Virtual Null Modem can sufficiently ease the work of
software developers and testers occupied in the field
of industrial automation. Furthermore, the program may
also be useful in the reverse engineering as well as
in educational needs. So go ahead and download FREE
trial version now!

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