[time-nuts] Mounting GPS Antenna on Steel Roof
Brian Kirby
kirbybq at bellsouth.net
Sat Mar 8 04:16:15 UTC 2008
Attached is a interface for an Oncore VP receiver. You will have to
check - I believe the GT and UT use the same connections as the VP.
Brian Kirby wrote:
> The inverter is required because the Motorola GPS receiver uses TTL and
> the PC serial port uses RS232.
>
> RS232 uses a positive voltage of +3 to +25 volts to indicate a logic
> zero, and a negative voltage of -3 to -25 volts to indicate a logic one.
>
> Brian KD4FM
>
>
>
> Bruce Griffiths wrote:
>
>> Hal Murray wrote:
>>
>>
>>>> Well, I plugged my Oncore UT+ into my PC and it didn't work until I
>>>> put a level shifter in... no damage but no data either. So far I've
>>>> been lucky in that every device I tried that needed a level shifter
>>>> wasn't damaged by the lack of one.
>>>>
>>>>
>>>>
>>> The normal MAX232 type level shifters include an inverter.
>>>
>>> So even if the voltage levels work without a level shifter, the signal will
>>> be upside down.
>>>
>>>
>>>
>>>
>>>
>> To play safe, if one isnt sure that an inverter is required or not an
>> exclusive OR can be used so that the signal can be inverted or not as
>> required.
>>
>> Bruce
>>
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>>
>>
>
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