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
>>>
>>>
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>>
>>
>> --
>> Roberto Spadim
>> Spadim Technology / SPAEmpresarial
>>
>
>
>
> --
> Roberto Spadim
> Spadim Technology / SPAEmpresarial
>
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
------------------------------------------------------------------------------
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contains a definitive record of customers, application performance,
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