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Serial ports Monitor. Engineer must have tool.

A combination terminal/sniffer. serial terminal, telnet and a network sniffer, all rolled into one, with plenty of added functionality. Handles connectionless UDP, including broatcasts, multi-node communications, and more.

Eltima Virtual Serial Port Driver – мощный программный пакет для создания любого количества виртуальных пар последовательных портов, соединенных через виртуальный нуль-модемный кабель без использования реальных COM портов.

Eltima Virtual Serial Ports Driver XP creates any number of virtual serial ports in your system and connects them into pairs via virtual null modem cable. You can create as many virtual serial ports in your system as possible to fit your needs.