Download Overview of Computer Networks

CPET 355
RS 232 Serial Communication
Paul I-Hai Lin, Professor
Electrical and Computer Engineering Technology
Purdue University, Fort Wayne Campus
Feb. 16, 2004
Prof. Paul Lin
1
RS 232 Serial Communication
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A simple, universal, well understood data
interface was introduced in 1962
Max 256 kbps, line length 15 M (50 ft) or
less
Signal representation (bipolar: +3 to +15v,
-3v to –15v)
• MARK (negative voltage) – idle or off state
• SPACE (positive voltage) – active or on state
Feb. 16, 2004
Prof. Paul Lin
2
RS 232
Web References
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RS 232 Level Converters
http://www.lookrs232.com/rs232/level_con
verters.htm
National Instruments
http://sine.ni.com/apps/we/nioc.vp?cid=13
41&lang=US
RS 232
http://www2.rad.com/networks/1995/rs232/
rs232.htm
Feb. 16, 2004
Prof. Paul Lin
3
RS 232
Web References
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RS 232 Standards
http://www.camiresearch.com/Data_Com_
Basics/RS232_standard.html
RS 232 Pin out on DB 25
http://www.sangoma.com/signal.htm
RS 232 Data Interfaces
http://www.arcelect.com/rs232.htm
Feb. 16, 2004
Prof. Paul Lin
4
RS 232
Web References
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RS 232 Cabling Tutorial
http://www.vector.kharkov.com/product/cyclades/
tech/cab.htm
RS 232 Data Interfaces
http://www.arcelect.com/rs232.htm
PC Serial Port Programming
http://www.ctv.es/pckits/tpserie.html
VB Serial Port Programming
http://www.imakenews.com/labtech/e_article000
151001.cfm
Feb. 16, 2004
Prof. Paul Lin
5
RS 232
Web References
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RS-232 and PIC Programming
http://www.iptelnow.de/HOWTO/PIC/pic.html
RS 232 and C Programming
http://www.lookrs232.com/com_port_progr
amming/api_read_write.htm
Feb. 16, 2004
Prof. Paul Lin
6