[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:

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


Chris Albertson
Redondo Beach, California

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