Simple RS 232 monitor
Simple RS 232 monitor is a small diagnostic program used to monitor RS 232 communications between devices. Usually, one device is a computer. The software supports baud rates from 110 up to 256000 baud, and 4 data bits to 8 data bits. Captured data may be timestamped, annotated, and saved in a... In source capture mode, the program allows the transmission of user-entered strings - this mode is ideal for diagnostic communication with modems and peripheral devices. ... In passive capture mode, the software can determine DTE and DCE communication settings automatically.
http://www.microactive.com.au/downloads/RS232Monitor.zip - 7Mb - Download - Screenshot

Bill Serial Port Monitor
To monitor (bi-directional) Serial communication RS-232 between two devices without physical cable, you can use the freeware Bill Serial Monitor. This freeware enable you to view, log, test and analyse the activity of the serial RS-232 port. If you want to monitor the serial protocol of two...
http://www.symcod.com/BillSerialMonitor.zip - 4Mb - Download - Screenshot

Windows Std Serial Comm Lib for PowerBASIC
MarshallSoft serial communication component PowerBASIC library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4PB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Can be ordered with or without source code for the DLL. ... Free technical support and updates for one year. ... Can be used with managed code. ... NET, VBA, Visual FoxPro, Visual dBase, Xbase++, and COBOL. ... NET, Visual Basic, VB.
ftp://ftp.marshallsoft.com/pub/windows/wsc4pb42.zip - 345Kb - Download - Screenshot

Windows Std Serial Comm Lib for Xbase++
MarshallSoft serial communication component Xbase++ library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4XB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Free technical support and updates for one year. ... Programmer's, Reference, Users and Serial Comm Manuals provided. ... Can be ordered with or without source code for the DLL. ... Can be used with managed code.
ftp://ftp.marshallsoft.com/pub/windows/wsc4xb42.zip - 327Kb - Download - Screenshot

Windows Std Serial Comm Lib for dBase
MarshallSoft serial communication component Visual dBASE library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4DB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Free technical support and updates for one year. ... Can be ordered with or without source code for the DLL. ... Programmer's, Reference, Users and Serial Comm Manuals provided. ... NET, PowerBASIC, Visual FoxPro, Xbase++, and COBOL.
ftp://ftp.marshallsoft.com/pub/windows/wsc4db42.zip - 339Kb - Download - Screenshot

Windows Std Serial Comm Lib for FoxPro
MarshallSoft serial communication component Visual FoxPro library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4FP) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Free technical support and updates for one year. ... Can be ordered with or without source code for the DLL. ... Programmer's, Reference, Users and Serial Comm Manuals provided. ... NET, Visual dBase, Xbase++, and COBOL.
ftp://ftp.marshallsoft.com/pub/windows/wsc4fp42.zip - 331Kb - Download - Screenshot

Windows Std Serial Comm Lib for Delphi
Serial communication component Delphi library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4D) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Can be used with managed code. ... Can be ordered with or without source code for the DLL. ... NET, C++ Builder, PowerBASIC, Visual FoxPro, Visual dBase, Xbase++, and COBOL. ... Can also use with Visual Basic, VB. ... Makes calls to Windows API functions only.
ftp://ftp.marshallsoft.com/pub/windows/wsc4d42.zip - 392Kb - Download - Screenshot

Virtual Null Modem
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 program emulates one or more couples of RS-232 serial ports connected via virtual null-modem cable. ... Usually you need to use virtual null-modem when you have two applications to be connected via serial ports. ... It is possible to create the unlimited couples of virtual serial ports on a single PC and connect them in any sequence...
http://www.virtual-null-modem.com/download/vnullmod20.exe - 1Mb - Download - Screenshot

Windows Std Serial Comm Lib for C/C++
Serial communication component C/C++ library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4C) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... Free technical support and updates for one year. ... Can be ordered with or without source code for the DLL. ... Programmer's, Reference, Users and Serial Comm Manuals provided. ... Can also use with Delphi, Visual Basic (VB. ... Makes calls to Windows API functions only.
ftp://ftp.marshallsoft.com/pub/windows/wsc4c42.zip - 569Kb - Download - Screenshot

Windows Std Serial Comm Lib for Visual Basic
Serial communication component VB and VB. NET library (DLL) for serial port (RS-232. RS-422, RS-485) communications. Features of the Windows Serial Communications Library (WSC4VB) include: Uses the standard Windows API to communicate with any device connected to a serial port. ... NET, PowerBASIC, Visual FoxPro, Visual dBase, Xbase++, and COBOL. ... Can be used with managed code. ... Can be ordered with or without source code for the DLL. ... Can also use with Delphi, Visual C++, C#, VC. ... Access, Excel, MS Office).
ftp://ftp.marshallsoft.com/pub/windows/wsc4vb42.zip - 411Kb - Download - Screenshot