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Having problems receiveing strings over RS232
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refa



Joined: 12 Dec 2003
Posts: 15

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PostPosted: Mon Jan 12, 2004 3:59 pm     Reply with quote
Yeah, I should ask them or solve the problem myself. Thank you a lot for your time PCM Programmer Smile
Ttelmah
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PostPosted: Mon Jan 12, 2004 4:00 pm     Reply with quote
refa wrote:
their website is: http://www.stecom.com/
module is: BK17 A5, transceiver

You obviously note the comment in the data sheet, that the "data must be preceeded by a 'preamble' 1 to 3mSec long to stabilise the AGC".
For radio comms, you will need to add a 'header' to the packet, with an identifier at the end, that the receive processor looks for.
So you send something like:

for (n=0;n<3;n++) putc(0xAA);
putc(0);

then the actual data.

At the receive, your code ignores characters, till the '0' if seen, and then receives the following data as the 'real' packet.
A technique like this is necessary with communications of this sort.

Best Wishes
refa



Joined: 12 Dec 2003
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PostPosted: Mon Jan 12, 2004 4:07 pm     Reply with quote
Ttelmah thank you a lot for sharing this. It 'll save me a lot of time Very Happy ... Thank you pal
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