[ntp:questions] Motorola Oncore UT+

Chris Albertson albertson.chris at gmail.com
Sat Aug 20 21:39:15 UTC 2011


On Fri, Aug 19, 2011 at 12:45 PM, Terje Mathisen <"terje.mathisen at tmsw.no
"@ntp.org> wrote:

> Miguel Gonçalves wrote:
>
>> Hello all!
>>
>> Anyone here tried to connect a Motorola Oncore UT+ to a server via RS232?
>>
>> I know many did it but some pointers would be great!
>
>
The UT+ has TTL outputs.  Some computer serial ports will work on TTL
voltage levels.  But TTL is outside of the RS232 spec.   I used a converter.
 The common MAX chip works well.

You need to add a DB-9 connector to whatever box holds the UT+.  I found a
DB-9 socket with the MAX chip and other parts all soldered together.  makes
t easy and only about $4 on eBay    I think you'll also need an hex inverter
chip as the RS232 spec uses low the 1 and high for 0 but the UT+ uses the
other more common TTL convention.

I used this one:
http://www.ebay.com/itm/MAX232-RS232-TTL-Converter-Adapter-Module-Board-New-/260838066800?pt=LH_DefaultDomain_0&hash=item3cbb290a70#ht_3762wt_1019

(that's ebay item 260838066800 if the above link does not work)

-- 

Chris Albertson
Redondo Beach, California



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