Subject:
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Re: 6 servos
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 22 May 1996 16:17:58 GMT
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Original-From:
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MAR ERICSON <mar@cooper^Spamless^.edu>
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Viewed:
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2419 times
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>
> > > The boards take serial input (2400 or 9600 baud). It is
> > > straightforward to write a 6811 assembly routine to output such serial
> > > signals on an arbitrary digital output.
>
> > Are the digital outputs at 5v high? I think you mentioned on the HB
> > homepage about the serial interface converting RS232 levels at +12 and
> > -12v to TTL level s (5v). I'm not that familiar with the nitty gritty
> > of RS232 so this kinda puzz les me.
>
> There are two types of serial voltages: TTL level and RS-232 level.
> The HB's serial interface board converts from TTL to RS-232 for
> communicating with the host computer.
>
> The Scott Edwards board accepts TTL levels, so an HB pin can drive it
> directly.
>
> The translation between logical level (e.g., is the bit a 1 or a 0),
> TTL, and RS-232 is anything but obvious:
>
> logical level TTL level RS-232 level
>
> zero or idle +5v -12v
> one 0v +12v
>
>
Just to make sure it wasn't a typo...so, the TTL level is "ative low"?
Also. Does the Scott Edwards board have the ability to be connected to a computer? or do you need a "TTL to RS232 converter"?
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Message is in Reply To:
 | | Re: 6 servos
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| (...) There are two types of serial voltages: TTL level and RS-232 level. The HB's serial interface board converts from TTL to RS-232 for communicating with the host computer. The Scott Edwards board accepts TTL levels, so an HB pin can drive it (...) (30 years ago, 22-May-96, to lugnet.robotics.handyboard)
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