Look up: RS 485

1. 
   RS (Reference Standard) 232-422-485
   Designations of various recommendations formulated to standardise the application of serial communication between connected computers, terminals, modems, instruments etc
   Found on http://www.amplicon.co.uk/info/glossary.
   
   
2. 
   RS 485
   Standard for serial transfer of PC data. Comparable with the RS 232 - standard. Here, also 1.200 m can be bridged. There are complying modifiers on the market which can transform a RS 232 signal into a RS 485 standard.
   Found on http://www.medium.co.uk/public/sales/glo
   
   
3. 
   RS-485
   This is an advanced format of digital communications compared to RS-232. It is a balanced line transmission system. The major improvement over RS422 is in the number of receivers that can be driven with this format, up to 32. It is classically a half duplex 2 wire presentation.
   Found on http://www.zoo.co.uk/~z0001325/Glossary.
   
   
4. 
   RS-485
   EIA-485
   Found on
   
   
5. 
   RS485
   Another EIA protocol for serial communications. Allows several devices to be connected to a single cable, distributed over a wide area. More details are in Issue 32 of Monitor.
   Found on http://www.windmill.co.uk/glossary.html
   
   
6. 
   RS485
   this is a physical interface (layer 1 in the ISO protocol stack) for serial data transfer - it is usable as an asynchronous or a synchronous interface - it uses 5-volt levels and differential signalling, making it good for longish cable runs and is relatively immune to common-mode noise as compared to RS232 - it is usually implemented as a half-dup...
   Found on http://www.archivemag.co.uk/