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Re: [ts-7000] Re: difference between rs232 and ttl COM port

To: <>
Subject: Re: [ts-7000] Re: difference between rs232 and ttl COM port
From: "Michael" <>
Date: Mon, 7 Apr 2008 10:11:40 -0700
> can anyone help me ?

I guess nobody was reading the mailing list over the weekend... ;-)

> --- In  late on a Friday night "e.pifferi" 
> <> wrote:
>>
>> i ve loaded the two moduel with modprobe :
>>                                            modprob tsuart1
>>                                            modprob tsuast7800
>> after that i ve set the com3 (rs232 ) at 9600 and it work if i launch
>> a bash command as cat /dev/ttts4 >> file.txt

Personally, I've had a lot of problems using cat/echo/etc. to talk to serial 
ports.  If you're writing code in C, I can point you to some sample code 
I've found to be useful in setting up the termios:

ftp://ftp.embeddedARM.com/tmp/term.c


>>
>> but if i do the same thing with a ttl com for example ttts8 after that
>> i setting it if i launch a cat /dev/ttts7 on LCD connector >> file.txt
>> it don't seems to catalog nothing

You may want to verify that you have the latest tsuart1/tsuart7800 
drivers... one version had a bug (a typo in the source, really) which caused 
some of the upper ports to show up but not get initialized properly.

ftp://ftp.embeddedARM.com/ts-arm-sbc/ts-7800-linux/binaries/ts-modules/


>> Ive attached to it a gps and it was in continuos stream data ( in
>> binary or nmea format )

I'm assuming that you are saying the GPS is outputting a TTL Tx signal?

>> ive connected to pin 14 of lcd port as in your guide is described tnks
>> to all for an answer .Emiliano

What pin are you connecting the ground to?



 ______   Best Regards,
|__  __/                  Michael Schmidt
   ||                   Software Engineer
   ||echnologic Systems (EmbeddedARM.com)
   || (480)    16610 East Laser Drive #10
   |/ 837-5200   Fountain Hills, AZ 85268
       http://oz.embeddedarm.com/~michael 


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