R309 AT Commands
©2015 Telegesis (UK) Ltd - 5 - AT Command Manual (Rev 3.09)
R3xx Firmware User Guide
Migration guide for existing R2xx firmware customers
ETRX3 Development Kit User Guides
Application notes from www.telegesis.com
The ETRX3 Product Manuals concentrate on the hardware specification of the modules. The
Development Kit Product Manuals contain all of the information required to set up your
development kit and run firmware upgrades where necessary.
1.4 Network topology
A network consists of a ZigBee Coordinator (ZC) which started the network, ZigBee Routers (ZR)
and ZigBee End Devices (ZED). There do not have to be any routers (other than the coordinator,
which functions as a router) or end devices in any given network. Each router can support up to
30 end devices in any combination of non-sleepy, sleepy and mobile End Devices. The network is
always formed as a mesh according to the ZigBee PRO featureset of the ZigBee standard; the tree
structure is not available.
By default the module joins a PAN as a router, but modifying register S0A allows you to define it as
an end device. The coordinator is simply the device that first establishes the PAN, and it should
not be allowed to leave the PAN as it is not possible for a node that is already joined to the PAN to
take over the role of a coordinator or Trust Centre.
1.5 The ADCs
The ETRX357 can operate up to 4 ADCs, which are individually enabled by settng the appropriate
bits in register S15. A reading is taken each time one of the registers S1F-22 is read, or when a
built-in function is executed which reads an ADC. If bit 8 of S15 is set the 1.2V Vref level is
presented at pin PB0 for the brief interval while the reading is taken.
Mode: single-ended
Range: 0-1200mV
Resolution: 14 bits
Units: 1 LSB = 0.1mV
Max load on PB0: 1mA
1.6 RTC Related Commands
The module runs a real time clock which can be set, read and synchronized against a time server
with the commands shown in this chapter. Please note that the basis of the real time clock is an
on-chip RC timer which gets calibrated against the external quartz crystal. Overall the accuracy is
not high and will vary with temperature, so if an accurate RTC is to be maintained frequent re-
synchronization with a time server is required.
1.7 A Note on ZigBee
®
Compliance
The Telegesis R300 firmware has been tested and certified for MSP (manufacturer specific profile)
compliance by a test house appointed by the ZigBee Alliance.
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