Communication

EIA/RS232-422-485:

• http://www.rs485.com/rs485spec.html
• http://www.arcelect.com/RS485_info_Tutorial.htm
• http://www.arcelect.com/485info.htm
• http://www.bb-elec.com/tech_articles/rs422_485_app_note/table_of_contents.asp
• http://www.maxim-ic.com/appnotes.cfm/appnote_number/723
• http://www.interfacebus.com/Design_Connector_RS422.html
• http://ckp.made-it.com/rs485.html
• http://www.lammertbies.nl/comm/info/RS-485.html

Fieldbuses

• http://en.wikipedia.org/wiki/Fieldbus

Profibus

• http://en.wikipedia.org/wiki/Profibus
• http://www.profibus.com/pb/

OLE for Process Control (OPC)

• http://en.wikipedia.org/wiki/OLE_for_process_control