[time-nuts] Nortel Trimble thunderbolt

Jim Sanford wb4gcs at wb4gcs.org
Sat Jul 6 12:56:16 EDT 2013


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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