yeah
what i´m telling is....
udp with rfc2217
we can change baud rate via character 0xff (IAC)
and all others characters go via udp protocol :)
just change the owserver to open a udp instead of tcp
and it will never close connection, in other works, we will never know if
other side is online, like a serial line... but we can´t know if host is up
or not... (for me no problems)
2011/11/29 Ziggy <[email protected]>
> After looking at this a little more closely, I don't think it will work.
> What I mentioned earlier is not enough to force a 'start polarity in place
> of the stop bit'. The UDP/serial converter is not going to be capable of
> changing it's character format so it will still be sending 8 bit data with
> a valid stop bit to the DS2480 no matter what we do. Apologies for the
> confusion, but I'll keep thinking about this. It would be nice to have a
> streamlined UDP solution.
>
> Ziggy
>
>
> On 11/29/2011 02:27 PM, Roberto Spadim wrote:
>
> where is the rfc2217 implention in owlib?
> i want know what commands owserver send to ser2net and start the udp
> protocol in microcontroller
>
> 2011/11/29 Roberto Spadim <[email protected]>
>
>> i will try to develop the rfc2217 in udp
>> all data send via udp is sent to serial, but character 0xff allow change
>> of baud rate and others thinks like rfc2217 tells
>> this could work?
>>
>>
>> 2011/11/29 Roberto Spadim <[email protected]>
>>
>>> uhmmmm nice...
>>> well we could develop the protocol without changing baud rate?
>>> the reset is need for what? power up? search bus?
>>> could we change tcp to udp? it´s easier to implement in microcontroller
>>>
>>>
>>> 2011/11/29 Ziggy <[email protected]>
>>>
>>>> You really need to read the datasheet to understand the issues. But the
>>>> biggest issue is that of resetting the DS2480 itself, not in the 1-wire
>>>> commands/data.
>>>>
>>>> You have basically two methods of resetting the chip:
>>>> - power cycle the chip
>>>> - reset it via software
>>>>
>>>> Hardware
>>>> If the 2480 is power stealing from the serial port, you can close the
>>>> port and reopen it, causing the control leads to toggle. This does a
>>>> power cycle of the chip. Otherwise you need to somehow remove power from
>>>> the chip and reapply it.
>>>>
>>>> Software
>>>> The DS2480B will perform a master reset equivalent to the power-on reset
>>>> if it detects start polarity in place of the stop bit. As described in
>>>> the datasheet, you have a couple of methods of doing this:
>>>>
>>>> - send BREAK sequence
>>>> - send character with SPACE parity
>>>>
>>>> A BREAK sequence is usually defined as 350ms or more of a continuous
>>>> SPACE condition. Setting the port speed to 4800 and sending a NULL will
>>>> cause SPACE condition for enough 9600 bps bit times that the 2480
>>>> resets. It's sort of a simulated BREAK. This is why some 1W drivers want
>>>> to change the port speed.
>>>>
>>>> With no TCP you have no telnet, and without telnet protocol you have no
>>>> IAC BRK, which is used by terminal/port servers to generate a BREAK
>>>> signal on the serial port. You also have no RFC2217 so no way to change
>>>> the port speed and use the 4800 bps NULL character method. It's only the
>>>> sending a character with SPACE parity that may work over UDP.
>>>>
>>>> The final thing to remember is that the DS2480B powers up in 9600 bps
>>>> mode. So the serial port on your UDP/serial converter must be set to
>>>> 9600 bps. This is going to limit throughput but again, without
>>>> TCP/telnet/RFC2217 you can't change the port speed in-band via software.
>>>>
>>>> I guess the summary is that DS2480B on a UDP/serial converter should
>>>> work if the DS2480B device reset is accomplished by sending the
>>>> character with SPACE parity. Havent tried it myself though.
>>>>
>>>> Ziggy
>>>>
>>>>
>>>> On 11/29/2011 12:13 PM, Roberto Spadim wrote:
>>>> > hi guys, someone could explain how ds2480b works?
>>>> > for example, what it must do with serial port (change baud rates,
>>>> > set/read DTS RTS etc.., send / receive)
>>>> > most important commands
>>>> >
>>>> > not all datasheet just some important points
>>>> >
>>>> > --
>>>> > Roberto Spadim
>>>> > Spadim Technology / SPAEmpresarial
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> All the data continuously generated in your IT infrastructure
>>>> contains a definitive record of customers, application performance,
>>>> security threats, fraudulent activity, and more. Splunk takes this
>>>> data and makes sense of it. IT sense. And common sense.
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>>>>
>>>>
>>>
>>>
>>> --
>>> Roberto Spadim
>>> Spadim Technology / SPAEmpresarial
>>>
>>
>>
>>
>> --
>> Roberto Spadim
>> Spadim Technology / SPAEmpresarial
>>
>
>
>
> --
> Roberto Spadim
> Spadim Technology / SPAEmpresarial
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common
> sense.http://p.sf.net/sfu/splunk-novd2d
>
>
>
> _______________________________________________
> Owfs-developers mailing
> [email protected]https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
>
>
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure
> contains a definitive record of customers, application performance,
> security threats, fraudulent activity, and more. Splunk takes this
> data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-novd2d
> _______________________________________________
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>
>
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
------------------------------------------------------------------------------
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contains a definitive record of customers, application performance,
security threats, fraudulent activity, and more. Splunk takes this
data and makes sense of it. IT sense. And common sense.
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