[aprssig] usb - serial
Jim WU3V
james at wu3v.net
Sat May 1 20:03:58 EDT 2010
Ben is this a laptop or a console based computer?
If the latter I have a computer I built up from parts and added 2 netmos
serial modules(PCI)
for a total of 4 ports;they work extremely well I have a trimble gps clock
(monitoring) and aprs Igate along with a PTC2 for a hf rms server.
I am quite happy with them.
Jim wu3v
----- Original Message -----
From: "Ben Lindner-VK5JFK" <vk5jfk at activ8.net.au>
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Saturday, May 01, 2010 23:46
Subject: Re: [aprssig] usb - serial
> Thanks for that Wes.
>
> Im not actually connecting a TNC at this stage. Its just connecting a
> Davis Wx station to a computer without any serial ports and wanted to see
> if people have had any issues with a usb-serial setup
>
> cheers
> Ben
> VK5JFK
>
> Wes Johnston, AI4PX wrote:
>> The only problems I've heard of with usb serial adapters are on the
>> transmit side of things. Many prolific usb adapters won't send a packet
>> out until they see a CR or LF... of course when you are in KISS mode, the
>> packets terminate with $c0, so they usually end up getting sent when the
>> next packets comes along, so they stay one packet behind. The reason for
>> this I think is that the packet _data_ actually ends with CR, but the
>> packet _frame_ ends with $c0... so the serial adapter sends the packet
>> out when it sees the CR, but that's not enough to make the TNC transmit
>> since the KISS protocol is awaiting for the $c0 that denotes the end of
>> the frame. So the TNC is essentially sitting on go, waiting for that
>> next $c0 to come along. When the next frame is sent, the data portion of
>> the packet once again ends in CR, the usb serial adapter sends it, and in
>> doing so, the TNC finally gets to see the $c0 it needs to go ahead and TX
>> the previous packet. Hope this makes sense.
>>
>> In normal CONVerse TNC mode this isn't a problem since each packet ends
>> with a CR and/or LF.
>> I'm not aware of any receiving problems with USB adapters though.
>>
>> Wes
>> ---
>> God help those who do not help themselves.
>>
>>
>> On Sat, May 1, 2010 at 17:54, Ben Lindner-VK5JFK <vk5jfk at activ8.net.au
>> <mailto:vk5jfk at activ8.net.au>> wrote:
>>
>> Hi All,
>>
>> Is anyone using a Vantage Pro2 serial unit with the APRS data
>> logger ( different to standard data logger ) with a USB-Serial cable.
>>
>> If so, have you encountered any problems
>>
>> cheers
>> Ben
>> VK5JFK
>>
>>
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