[time-nuts] Nortel Trimble thunderbolt

Jim Sanford wb4gcs at wb4gcs.org
Sat Jul 6 16:03:17 EDT 2013


Not yet.  Have to find/build a breakout box.  Was hoping I'm doing 
something stupid with a setting....

On 7/6/2013 1:17 PM, Ed Palmer wrote:
> Have you put a scope on the Nortel's transmit lead?  If it happens to 
> be putting out data you can at least determine the baud rate and 
> whether it's TTL or RS232 levels.  It might put out some kind of 
> startup message on powerup.
>
> Ed
>
> On 7/6/2013 10:56 AM, Jim Sanford wrote:
>> All:
>>
>> This is still not going well.
>>
>> I have tried 3 different computers, 2 running Win7 and one running 
>> XP.  the XP machine successfully controls an Icom radio on the same 
>> port, so I know the port is good.  I have tried a new serial cable. I 
>> have tried with and without a null modem.
>>
>> No matter what I do, Lady Heather reports no serial communications on 
>> comm/x.
>>
>> /Thanks & 73,
>> Jim
>> wb4gcs at amsat.org
>> /
>> /
>> On 7/6/2013 10:44 AM, Ed Palmer wrote:
>>> Certainly if you need a full implementation with various control 
>>> leads you might have to dig out the breakout box and figure it out. 
>>> But the volts / no volts idea is still useful for connecting pairs 
>>> like RTS/CTS or DSR/DTR.  But I'm surprised how many devices don't 
>>> use the control leads.  Most of the devices I work with don't even 
>>> use software flow control.
>>>
>>> Ed
>>>
>>> On 7/5/2013 10:06 PM, Chris Albertson wrote:
>>>> On Fri, Jul 5, 2013 at 7:03 PM, Ed Palmer <ed_palmer at sasktel.net> 
>>>> wrote:
>>>>
>>>>> I always cursed when I tried to figure out how to wire an RS232 cable
>>>>> until I realized that transmit had a voltage on it while receive 
>>>>> was close
>>>>> to zero volts.  So now I just remember that volts on one end 
>>>>> connects to no
>>>>> volts on the other end.  Works every time and I don't have to 
>>>>> think about
>>>>> straight or cross-over.
>>>>
>>>> That only works if there are only three wiresand no handshaking.  
>>>> What if
>>>> there is DTE/DCE and so on?
>>>>
>>>> But I think in this case it is just a three wire connection but 
>>>> still there
>>>> is room for errors like for example is one of them a TTL level and the
>>>> other RS-232.  Some times you can mix the two, sometimes not.
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