AVR-Chat

Remember, use of the ZigBee network layer is optional in all these
802.15.4 modules. Without ZigBee it's like using Ethernet without IP -
you can address packets by the MAC address.

The current (about to change) ZigBee standard says that end-nodes
(network leaf) can sleep. Routers cannot sleep. This is a big issue
for the new standard.

--- In AVR-Chat@yahoogroups.com, dlc@... wrote:
>
>   I don't think that you read the manual correctly.  Unless you want
some
> other kind of sleep mode.  To quote from the "Sleep" section of the XBee
> manual:
> 
> "Sleep Modes enable the RF module to enter states of low-power
consumption
> when not in use. In
> order to enter Sleep Mode, one of the following conditions must be
met (in
> addition to the module
> having a non-zero SM parameter value):
> • Sleep_RQ (pin 9) is asserted.
> • The module is idle (no data transmission or reception) for the
amount of
> time defined by the
> ST (Time before Sleep) parameter. [NOTE: ST is only active when SM =
4-5.]
> The SM command is central to setting Sleep Mode configurations. By
> default, Sleep Modes are disabled
> (SM = 0) and the module remains in Idle/Receive Mode. When in this
state,
> the module is
> constantly ready to respond to serial or RF activity.
> Higher Voltages. Sleep Mode current consumption is highly sensitive to
> voltage. Voltages above
> 3.0V will cause much higher current consumption.
> Pin/Host-controlled Sleep Modes
> The transient current when waking from pin sleep (SM = 1 or 2) does not
> exceed the idle current
> of the module. The current ramps up exponentially to its idle current.
> Pin Hibernate (SM = 1)
> • Pin/Host-controlled
> • Typical power-down current: < 10 &#956;A (@3.0 VCC)
> • Wake-up time: 13.2 msec
> Pin Hibernate Mode minimizes quiescent power (power consumed when in a
> state of rest or inactivity).
> This mode is voltage level-activated; when Sleep_RQ is asserted, the
> module will finish any
> transmit, receive or association activities, enter Idle Mode and then
> enter a state of sleep. The
> module will not respond to either serial or RF activity while in pin
sleep.
> To wake a sleeping module operating in Pin Hibernate Mode, de-assert
> Sleep_RQ (pin 9). The
> module will wake when Sleep_RQ is de-asserted and is ready to
transmit or
> receive when the CTS
> line is low. When waking the module, the pin must be de-asserted at
least
> two 'byte times' after
> CTS goes low. This assures that there is time for the data to enter
the DI
> buffer."
> 
>   Blah, that didn't format out too well...  Anyway, the XBee
networks are
> designed to run in low power sleep mode for sensor arrays, so sleep and
> indirect transmission queueing are indeed supported at the coordinator.
> 
> DLC
> 
> > Thanks for various responses to my original Zigbee question ...
> >
> > Had a quick scan of the XBee Zigbee manual (as opposed to 15.4) and it
> > would appear these modules don't support sleep mode for "end
devices" -
> > is this correct, and does it therefore mean that XBee isn't
suitable for
> > mesh networking with battery powered end devices?
> >
> > Does one have to buy membership of the Zigbee Alliance to use
these (or
> > any other) modules in a commercial product? The ZA membership FAQ
> > suggests strongly that this is the case:
> >
> > *"Q: If my company uses a ZigBee module in my product, do I need
to be a
> > member?*
> > A: Yes."
> >
> > Are all commercial XBee users coughing up $3500 to ZA?!
> >
> > Mark
> >
> >
> > larry barello wrote:
> >> I did my complete development with the Xbee using TTY serial on my
> >> doodads
> >> (connected to mega128's).   They were pretty easy to use once I
figured
> >> out
> >> how to configure them to do what I wanted.  You only need the level
> >> shifter
> >> if you want to connect to a PC for firmware upgrades (or
> >> communications).
> >>
> >> I don't know about the 1 mile.  You can talk with the Xbee
support folks
> >> (they are *very* phone friendly) and they will give you a white paper
> >> detailing how they came across that number.  It involved the whip
> >> antennas
> >> and line-of-site.  YMWV
> >>
> >>
> >>
> >>
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>