[sdiy] MIDI specifications round 2

[John L Marshall]

Yup. Unless you are from the really old school of 60 mA loops.


Take care,
John
www.sound-photo.com
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----- Original Message ----- 
From: "Scott Bernardi" <sbernardi at attbi.com>
To: "Synth-DIY list" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, April 17, 2003 7:18 PM
Subject: Re: [sdiy] MIDI specifications round 2


> I may be wrong, but I though current loops used 4mA as the "zero" point,
> giving a range of 20mA-4mA = 16mA for full scale. 0mA would indicate a
> break in the line.
> 
> BrightBoy wrote:
> 
> > > I'm not familiar with UART's, but I'm assuming they're IC's
> > > that are used for Asynchronous transfer's, add start/stop bit, etc.
> >
> > Precisely....
> >
> > > Looking over my microcontroller a little more, I have notice
> > > that it has a SCI built in.
> >
> > What specific microcontroller/model are you using????
> >
> > > All I would have to do is set the baud and write to the
> > > register and it should take care of the start/stop bit
> > > for me.
> >
> > Yep.  But you'll also have to configure the UART for the
> > number of start/stop bits, as well as baud rate....
> >
> > > I'm not sure what the current loop is/does
> >
> > 20ma present = ON
> > 0ma present = OFF
> >
> > Cheers,
> >
> > Jeff
> 
>