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Forum Index : Microcontroller and PC projects : COM 1 Problem

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edu001
Regular Member

Joined: 14/07/2014
Location: United Kingdom
Posts: 82
Posted: 09:45am 31 Oct 2014
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Hi

I am trying to open COM1 with 1 stop bit like this: OPEN "COM1:9600, S1 AS #1

I get Error: Not enough memory

Where as OPEN "COM1:9600, S2 AS #1 works ok

Any Ideas
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4036
Posted: 10:04am 31 Oct 2014
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Missing quote

John
 
hitsware
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Joined: 23/11/2012
Location: United States
Posts: 535
Posted: 10:08am 31 Oct 2014
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Assuming you have a MicroMite......:See page 53 ......
 
edu001
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Joined: 14/07/2014
Location: United Kingdom
Posts: 82
Posted: 10:16am 31 Oct 2014
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  JohnS said   Missing quote

John


You are correct


 
edu001
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Joined: 14/07/2014
Location: United Kingdom
Posts: 82
Posted: 10:19am 31 Oct 2014
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Just miss typed OPEN "COM1:9600, S1" AS #1

I really need to fix this

The protocol I need to follow is 1+8+1 no parity

Is the start bit the rising edge and the stop bit the falling edge or do I need to define it ?

 
edu001
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Joined: 14/07/2014
Location: United Kingdom
Posts: 82
Posted: 10:31am 31 Oct 2014
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  hitsware said   Assuming you have a MicroMite......:See page 53 ......


Thanks for the link :) but I have been through the manual and there is no mention of using start bits or S1 as a single stop bit
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4036
Posted: 10:35am 31 Oct 2014
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Bearing in mind the manual states the defaults I'm not sure why you're using what you have.

John
 
edu001
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Joined: 14/07/2014
Location: United Kingdom
Posts: 82
Posted: 10:59am 31 Oct 2014
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  JohnS said   Bearing in mind the manual states the defaults I'm not sure why you're using what you have.

John


I was discussing it with WW and could not ascertain if 1 stop bit was the default value and 2 stop bits was an option or do both have to be defined ?
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6269
Posted: 11:13am 31 Oct 2014
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One stop bit is the default setting.
If you want one stop bit just leave the S2 out altogether.

The other thing that catches people out is the polarity.
Maximites generally use TTL which has the resting level at +V and a start bit will go to zero.
RS232 has a resting level of -V and a start bit will go to +V

You might need to INVert the signal.

Jim


VK7JH
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