RS232

• DB25 and DB9 signal pin connections
• Signal definitions with pin numbers for DB25 and DB9
• Sequence example: An incomming call to a Modem connected to a PC
• serial/16550af.htm
• Parasitic power from RS232 hosts
• TTL to/from RS232

See also:

• Dallas Semiconductor has an excellent PDF document on RS-232. App Note 83 Fundamentals of RS-232 Serial Communications
• National Semiconducor AN-681: PC Mouse Implementation Using COP800
• Tom Enghahls Telecommunications Electronics Page
  • http://www.hut.fi/~then/mytexts/mouse.html
  • http://www.hut.fi/~then/electronics/pc.html#pc_mouse
• http://www.argonet.co.uk/users/4qd
• http://www.bb-elec.com/bb-elec/literature/.bab_newsletters/newsltr2.pdf
• http://www.airborn.com.au/rs232.html --Schematic diagrams showing how to wire up RS232 connectors with handshaking and without, loopback plugs and null modem
• http://www.strangecreations.com/strange/library/hardware/index.htm
• MicroChip has a very nice app note on rolling your own mouse. Both the Microsoft and Mouse Systems versions are covered. You might have to read a little PIC code to find what you want, but its there. The app note can probably be obtained from the microchip web site. App # is AN519.
• home.iis.com.br/~alexg opto-isolated RS-232 compatible interface with schematic
• Sharp palm-top/hand-held and Sharp Wizard to RS232 converter
• Ken's Gameboy and PIC Projects Page
• Using RJ-11 or 45 connectors (and cables) for RS-232
  • http://www.hut.fi/~then/mytexts/rs_rj45.html
  • http://www.advanix.com/~neuhaus/serial/index.html
  • http://www.yost.com/Computers/RJ45-serial/
  • http://www.cisco.com/warp/public/701/14.html