yes, i´m reading it :)
only IAC BREAK is interesting, and IAC IAC (0xff character to serial),
others isn´t
but... could owserver run only with 9600 bauds? it don´t need to change
baud rate?
it only change baud rate for reset? when it need to reset?
how it send reset via serial?
put(fp,break_character); ????
or
ioctl(fp, BREAK); ???
i never sent a break via serial
2011/11/29 Ziggy <[email protected]>
> Does it need to be that complex? Do you really need anything other than
> IAC BREAK? I don't believe so. Only if you wish to run the DS2480 at higher
> than 9600 bps, which is optional. In fact, the data sheet shows that a
> number of functions are not supported at higher data rates anyway.
>
> On Nov 29, 2011, at 5:11 PM, Roberto Spadim wrote:
>
> 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.
>>>>> http://p.sf.net/sfu/splunk-novd2d
>>>>> _______________________________________________
>>>>> Owfs-developers mailing list
>>>>> [email protected]
>>>>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> 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
>>
>>
>>
>> _______________________________________________
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>> [email protected]https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>
>>
>>
>>
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>> 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
>
> ------------------------------------------------------------------------------
> 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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>
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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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Spadim Technology / SPAEmpresarial
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