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
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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 list
> [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_______________________________________________
Owfs-developers mailing list
[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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