owserver can run at 9600 baud just fine. Only the passive circuit needs to
vary the baud rate. Actually the baud rate and settings depend on the
specific bus master.
So more accurately, the LINK and DS2480B both run fine at 9600 baud.
The HA7E and HA7S run at 9600 baud, I think.
The HA5 needs 115200
The (passive) DS9097 switches between 9600 and 115200 to synthesize the
reset pulse and data pulse respectively.
Paul Alfille
On Tue, Nov 29, 2011 at 8:32 PM, Roberto Spadim <[email protected]>wrote:
> 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.
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>>>>>> _______________________________________________
>>>>>> 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
>>>
>>>
>>>
>>> _______________________________________________
>>> 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
>>
>> ------------------------------------------------------------------------------
>> 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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>>
>
>
> --
> 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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