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Standard Organizations
- International Telecommunications Union (ITU)
- International Organization for Standardization (ISO)
- Internet RFC/STD/FYI/BCP Archives
- American National Standards Institute (ANSI)
- IEEE Standards Association
Protocol Analyzers
Communications Theory On-line
- Protocol Directory
- Free On-line Dictionary of Computing
- Global Engineering Documents
- RAD University
- Connected: Internet Encyclopedia
- Cisco's Internetworking Technology Handbook
- Pinouts for Serial Interfaces
- Basics of RS-422 and RS-485 Communications
- RS-232, RS-422, RS-485 TI Video