[chirp_devel] VX2r

[Richard Farina]

On 02/12/12 00:34, Andrew Errington wrote:
> On Sun, 12 Feb 2012 11:28:00 Dan Smith wrote:
>>> I will try another 4-pin cable.  And I will try a diode between Tx and
>>> Rx.  It seems to me that the radio is trying to pull down the data line,
>>> but the PC Tx line is pulling up (idle).
>> None of the radios I've built cables for (which is many) have ever had a
>> diode in the mix. The radio expects to see its own echo, so if you try
>> to prevent that with the diode, then it will stop transferring
>> immediately. If you put the diode the other way, then you haven't
>> changed the circuit any.
> I'm still not sure.  The radio will always see its own data, as Tx and Rx are 
> connected internally.  If I use a diode then it stops the idle state of PC Tx 
> fighting (pulling up) if the radio wants to pull it down.
>
> I have added a diode and I have made some progress.  VX2 Commander 'sees' the 
> radio, but only gets one block of data.  It seems the protocol is block 
> oriented- radio sends some data and waits for something before proceeding.
>
> Here's the dump from VX2 Commander:
> Data Received. Length: 11   Data: 41 48 30 31 35 24 E8 01 00 24 00
> First Block: [41 48 30 31 35 24 E8 01 00 24]
> -------------------------------------
> CPU: 01 00 USA
> Mod Setting: E8 (Freeband)
> -------------------------------------
> Sent: 06 Acknowledge...
>
> Then the radio times out and displays "ERROR".
If data is only flowing from the radio now maybe that diode wasn't such
a great idea?  Pretty sure Dan might have mentioned that....

-Rick WZ3RO
>
> Next, I can see data using gtkterm running at 19.2k 8 data bits, no parity.  I 
> get "AH015" !
>
> So, with Chirp I get this trace:
> CHIRP 0.1.12 on Linux - MEPIS Linux 8.0
> Clone thread started
> 000: 41 48 30 31 35 24 e8 01   AH015$..
> 008: 00 24 00 00 00 00 00 00   .$......
>
> Then the radio times out and I have to hit Cancel.
>
> I have some chores to get on with, but I'll keep trying different things when 
> I have time.
>
> 73,
>
> Andrew
> ZL3AME
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