Solved

RTS/CTS handshake on RS232C

Posted on 1997-06-10
2
2,422 Views
Last Modified: 2010-08-05
I have developed a program in Borland C for MSDOS which handles serial communications over COM1/2/3/4 using only the pins TXD, RXD and GND. (I access the UARTs directly). I have been using Xon/Xofff software handshake but now would like to use RTS/CTS for hardware handshake. My problem is that I don't know what the standard is! What shall I do with RTS/CTS to provide data integrity?
When shall I raise and/or lower RTS?
When shall I check CTS? Do I need to check?
I would appreciate if somebody could come up with some help and maybe some documents about this subject.

Thanks in advance,

Paulo Neves
0
Comment
Question by:pneves
2 Comments
 

Author Comment

by:pneves
ID: 1251216
Edited text of question
0
 

Accepted Solution

by:
aviad earned 50 total points
ID: 1251217
The following is an excerpt from http://www.med2000.com:457/HANDBOOK/RTS_CTS.html
--------------
The Ready To Send (RTS) and Clear To Send (CTS) lines for the RS-232 serial interface were originally intended as handshaking signals between a DTE device (computer, printer, and so forth) and a DCE device (almost always a modem). This section describes unidirectional handshaking between two DTE devices: a computer and a printer. The computer asserts its RTS (Ready To Send) line when it is ready to send data to the printer. The printer asserts its RTS when it was ready to receive data.

If the printer's input buffer is nearly full, it lowers its RTS line (connected to the computer's CTS (Clear To Send) line). If the computer sees CTS go low, it stops sending data until it goes high again when the printer has caught up.
----------------
Hope this helps.
Aviad.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Where is my core dump file in Ubuntu? 12 453
Concatenate two strings Last and First Name 10 60
UPD maximums on Red Hat 6 120
Test the speeds on my PC Drives 12 62
Windows programmers of the C/C++ variety, how many of you realise that since Window 9x Microsoft has been lying to you about what constitutes Unicode (http://en.wikipedia.org/wiki/Unicode)? They will have you believe that Unicode requires you to use…
Examines three attack vectors, specifically, the different types of malware used in malicious attacks, web application attacks, and finally, network based attacks.  Concludes by examining the means of securing and protecting critical systems and inf…
The goal of this video is to provide viewers with basic examples to understand and use structures in the C programming language.
The goal of this video is to provide viewers with basic examples to understand and use conditional statements in the C programming language.

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question