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Forum Index : Microcontroller and PC projects : COM question

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Tinine
Guru

Joined: 30/03/2016
Location: United Kingdom
Posts: 1646

Posted: 08:38pm 24 May 2019

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Hey guys,

I need to handle this in MMBASIC.

1 start bit and 1 stop bit?
There is a QB example and it simply shows [BAUD],N,8,1

"The communication protocol uses 8 data bits, 1 start bit, 1 stop bit and no parity."

The above quote is from the documentation.

Cheers!

seco61
Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 205

Posted: 01:41am 25 May 2019

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Hi.

This is the default that the MMBASIC COM ports will use - so you do not have to do anything special to get this.

Example for 9600 baud:

OPEN "COM1:9600" AS #1

You can add extra options if you want to increase the default RX buffer size and/or use an interrupt (which I thoroughly recommend).

Regards

Gerard (vk3cg/vk3grs)

Turbo46

Guru

Joined: 24/12/2017
Location: Australia
Posts: 1646

Posted: 01:48am 25 May 2019

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Hi Tinine,

Quote 8 data bits, 1 start bit, 1 stop bit and no parity

That is pretty much the default for serial communications. See the Manual in the "Serial Communications" section.

The Manual says:

Quote OPEN comspec$ AS #fnbr
�fnbr� is the file number to be used. It must be in the range of 1 to 10. The # is optional.
�comspec$� is the communication specification and is a string (it can be a string variable) specifying the serial port to be opened and optional parameters. The default is 9600 baud, 8 data bits, no parity and one stop bit.
It has the form "COMn: baud, buf, int, intlevel, DE, 9BIT, INV, OC, S2"

Simply:

Open "Com1:9600" as #1

will do it where 9600 is the baud rate (see the manual for the available baud rates).

Bill

Edit: Sorry Gerard I was typing at the same time.Edited by Turbo46 2019-05-26

Keep safe. Live long and prosper.

seco61
Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 205

Posted: 02:14am 25 May 2019

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Hi Bill.

What can I say - great minds and all that...

Regards

Gerard (vk3cg/vk3grs)

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