Understanding Serial Direct Cable Connection

This article explains the concept of serial data connections. Topics covered include: PC Serial ports, pinouts, speeds, connector interfaces (db9, db25), null modem cable pinout (db9 and db25) and much more. Included are diagrams with all pinouts and functions.
http://www.firewall.cx/networking-topics/cabling-utp-fibre/121-network-serial-cable.html

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