-
8/17/2019 6-rs232-rs485
1/11
1
10 th OCT 2011
10-10-2011 1
Deltastar power project services Pvt.Ltd
Name of the Trg. Prg. : Fast Track Training programme
for Experienced Engineers
on Power system Protection
Topic : arrier omm!nication "asics#
omm!nication Protocol and carrier protection
Date : $% th &T. '%$$
By : Er .R.SURENDRAN
(Former SE/P&C/TNEB)
-
8/17/2019 6-rs232-rs485
2/11
2
RS232 and RS485
-
8/17/2019 6-rs232-rs485
3/11
3
Wha !" RS#232
$ RS#232 !" a %o%'ar ommn!a!on"!nerae or onne!n* mo+em" an+
+aaa,!"!!on +e-!e" (!.e. PS ree!-er"e'eron! 0a'ane" +aa 'o**er"
...) oom%er".
$ RS#232 an 0e %'**e+ "ra!*h !no heom%er" "er!a' %or (no a" C45
orComm %or).
-
8/17/2019 6-rs232-rs485
4/11
6
Wha !" RS#232
$ RS#232 !" a %o%'ar ommn!a!on"!nerae or onne!n* mo+em" an++aa
a,!"!!on +e-!e" (!.e. PS
ree!-er" e'eron! 0a'ane" +aa'o**er" ...) o om%er".
$ RS#232 an 0e %'**e+ "ra!*h !nohe om%er" "er!a' %or (no a"C45
or Comm %or).
-
8/17/2019 6-rs232-rs485
5/11
7
RS#232 S!*na'"
$ RS#232 !" a 0!#+!re!ona'
%o!n o %o!n '!n.("er!a' %or # PC "!+e)Two independent
channels
are established for two-
way (full-duplex)
communications
!"-2#2 can also carry
additional signals used for
flow control (!T"$ %T")and modem control
(&%&$ &T!$ &"!$ !')
-
8/17/2019 6-rs232-rs485
6/11
8
RS#232 S!*na'"
$ Common 27 %!n D#"he'' onneor %!no "e+
or a"ynhrono" +aa ommn!a!on".
PinPin SignalSignal
1 PGND Protective Ground2 TXD Transmit Data3 RXD Receive Data4
RTS Ready To Send5 CTS Clear To Send
DSR Data Set Ready! SG Signal Ground" CD Carrier Detect2# DTR
Data Terminal Ready22 R$ Ring $ndicator
("er!a' %or # PC "!+e)
-
8/17/2019 6-rs232-rs485
7/11
9
RS#232 S%ee+
$ o a" an RS#232 0e;
> 0a+.)
-
8/17/2019 6-rs232-rs485
8/11
$ Wha !" RS#67;
-
8/17/2019 6-rs232-rs485
9/11
RS#232 -" RS#67
$ The arh!era' +!erene 0eeen RS#232 an+ RS#67!" ha 232 !" a
0!#+!re!ona' %o!n o %o!n '!n herea"
67 !" a "!n*'e hanne' 0".
$ E'er!a''y eah 232 "!*na' "e" a "!n*'e !re !h"ymmer! -o'a*e"
a0o a ommon *ron+ !re. 67
"e" o !re" o arry he "!n*'e "!*na' +!eren!a''y.
$The 0!* +!erene o he "oare !" ha on'y one +e-!eon a 67 0" an
ran"m! a a !me h!'" here !" no
"!m!'ar '!m!a!on on RS232 0ea"e !" a %eer#o#%eer
'!n
.
-
8/17/2019 6-rs232-rs485
10/11
1>
RS-232RS-232 RS-485RS-485
Mode of Operation SINGLE-ENDEDDIFFERENTIAL
Total Number of Drier! " DRI#ER $% DRI#ER
and Receier! on One Line " RE&EI#ER $% RE&EI#ER
Ma'imum &able Len(t) *+ FEET ,+++ FEET
Ma'imum Data Rate Ma' len(t) %+.b/! "++.b/!
Drier Load Impedance $.Ω to 0.Ω *,Ω
RS-232 vs RS-485RS-232 vs RS-485
-
8/17/2019 6-rs232-rs485
11/11
11
