[time-nuts] Trimble Thunderbolt 1pps

Don Latham djl at montana.com
Tue Jan 28 01:32:59 EST 2014


wellll, maybe needed if you're running an ASR-33 teletype. . .
Don

Mike S
> On 1/27/2014 1:33 PM, Robert Atkinson wrote:
>> I looked at this a while ago. The "spec" only defines transmission
>> levels, it does NOT specify receive thresholds.
>
> It certainly does...
>
> "2.1.3 For data interchange circuits, the signal shall be considered in
> the marking condition when the voltage on the interchange circuit,
> measured at the interface point, is more negative than -3 volts with
> respect to Circuit AB (Signal Common). The signal shall be considered in
> the spacing condition when the voltage is more positive than +3 volts
> with respect to Circuit AB (see 6.2). The region between +- 3 volts is
> defined as the transition region. The signal state is undefined when the
> voltage is in this transition region."
>
> - ANSI TIA/EIA-232-F (1997)
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-- 
"The power of accurate observation is commonly called cynicism by those
who have not got it."
 -George Bernard Shaw


Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com




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