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
------------------------------------------------------------------------------
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
