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rogersan
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Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 12:06am 25 Nov 2015

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I am trying to send 3 characters from COM1 without carriage return and line feed.

I tried putting a semicolon at the end of the print string, to suppress the CR and LF, but it is not working. Instead of 3 characters being sent out on COM1, I get 6. The extra characters are ; and CR and LF.

Tstr$=chr$(85)+chr$(2)+chr$(160)+";"
Open "com1:9600" as #5
Print #5,Tstr$

Does anyone know how to make this work?

twofingers

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Joined: 02/06/2014
Location: Germany
Posts: 1773

Posted: 12:10am 25 Nov 2015

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I would try this

Tstr$=chr$(85)+chr$(2)+chr$(160)
Open "com1:9600" as #5
Print #5,Tstr$;

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Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 10044

Posted: 12:12am 25 Nov 2015

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Agreed. Semicolon suppresses the CR and LF on any print command.

EDIT: As you have probably gathered by now, the semicolon has to be part of the command syntax, not a byte of the actual message as in your example.

Edited by Grogster 2015-11-26

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rogersan
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Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 08:44am 25 Nov 2015

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Thanks very much, now only 3 characters are going out to the Texas Instrumements TMP107 temperature sensor, and I can see a two character reply.

However the INPUT statement is not getting the data. I tried

Indat$=INPUT(10,#5)
LCD 1,1,Indat$

And just get a blank line on the LCD display. LOC says there are five characters in the buffer. I should see "U" as the first character in the receive buffer, as the characters sent are all received ie. Chr$(85) is "U".

I did have to put a delay before the INPUT, otherwise LOC said there were 0 characters in the receive buffer.

Perhaps the receive buffer is too slow to get the data, any suggestions.

rogersan
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Joined: 10/04/2015
Location: Australia
Posts: 79

Posted: 09:03am 25 Nov 2015

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Sorry that line should be

Indat$=INPUT$(10,#5)

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 11902

Posted: 09:04am 25 Nov 2015

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Put this:

DO WHILE LOC(#5)<5:LOOP

before the input statement
Edited by matherp 2015-11-26

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