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ELTIMA Software is a global information technology company, specializing in virtual serial communications, multimedia software development and quality web-development solutions

MagTek is a leading manufacturer of electronic devices and systems for the reliable issuance, reading, transmission and security of cards, checks, PINs and other identification documents.

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HHD Software Free Serial Port Monitor - RS232 Communication Software Data Sniffer and Analyzer. Analyze Your Com Port Communication Data Traffic. Freeware Modem Data Capture Utility, Connection Test Tool Packet Analyser

Termie opens a serial port and allows you to communicate with it in a chat-like interface.

US Converters are experts in serial data applications and supply USB Serial Adapter, RS232 to RS485 Converter, RS232 to RS422, USB to RS485, USB to RS422, Serial PCI, PCMCIA, Serial Wireless, Serial Bluetooth and serial Ethernet Products.

USB RS232 - FTDI designs and supplies USB semiconductor devices with Legacy support including royalty-free drivers. Application areas include USB RS232, (USB Serial), USB Parallel, USB Docking Stations and upgrades of legacy designs to USB.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Serial Port Monitor Terminal Protocol Analyzer Software, Monitor RS232 RS485 RS422 TTL with timestamps and direction indication, Win 7/Vista/XP/2K/98.