User's Manual

MaxStream, Inc. 24XStream Wireless Module Manual v2.8
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Half-duplex – Radios that operate in half-
duplex are able to either transmit data or
receive data at a given time, but cannot do
both simultaneously. The 24XStream is
half-duplex. When one module is
transmitting, all modules (with the same
VID) within range listen to the transmission
and will only transmit once the transmission
is complete.
Hardware flow control – See “Flow
control”.
Headers – Information that prefaces the
data bits in transmitted data packets. The
header contains information used by the
receiver(s) to synchronize to the transmitter.
HyperTerminal – A serial communications
program useful for communicating with the
24XStream module and configuring user-
defined operating parameters through AT
commands.
Idle Mode – A mode of operation in which
the 24XStream module is neither
transmitting nor receiving. In Idle Mode,
the module can transition to Receive Mode
if over-the-air data is detected, Transmit
Mode if serial data is presented on the DI
pin, or Command Mode if either Binary or
AT command mode is invoked.
Industrial Temperature – Temperature
tested version of 24XStream modules
extending beyond normal operating
specifications (0ºC to 70ºC). These modules
are tested for a temperature range from
-40ºC to 85ºC.
Integration – The simple process of
dropping the 24XStream module into an
application in place of a serial cable.
Interface board – An optional board
available with the 24XStream module that
converts RS-232 level data into CMOS logic
levels. The interface board is especially
useful for developing with the 24XStream
module.
Long header – A lengthy header (length
determined by LH command) sent out to
ensure that modules running in a cyclic
sleep mode can detect the header when they
awake and synchronize to the transmission.
Low-power modes – See “Sleep Mode”.
Module Addresses – Provides a layer of
addressing among modules. Modules with
the same Module Addresses can
communicate together.
Module Address Masks – Provide a layer
of filtering to received (over-the-air) data
packets. The address (of the transmitting
module) is logically “ANDed” with the
Module Address Mask of the receiver. The
resulting value must match the Module
Address of the receiver for the packet to be
received. All “0” values are not compared.
Networks – Provides a layer above Module
Addresses for communicating between
modules. Each network has a unique
hopping sequence that allows modules on
the same network to remain synchronized to
each other.
Pin layout – Describes the layout and
functionality of all pins on the 24XStream
module.
Pin sleep – This Sleep Mode setting puts the
24XStream into a minimal power state when
the SLEEP pin is asserted. It remains in Pin
sleep until the SLEEP pin is de-asserted.
This setting must be enabled using the SM
command.
Power-saving modes – See “Sleep Mode”.
Receive Mode – A mode of operation that
receives over-the-air data and transmits all
valid data packets out to the serial port. The
module must be in Idle Mode to transition to
Receive Mode.
RS-232 logic – Standard logic levels
implemented in all RS-232 devices.
RTS/CMD – The RTS/CMD pin (Pin 5) is
used primarily to configure Binary
commands (CMD). RTS (Request to Send)
flow control is not implemented in the
24XStream module.
Sensitivity – A measurement specification
that describes how weak a signal can be (in
dBm) and still be detected by the receiver.
Serial data – Data that enters the
24XStream module through its serial port.
Serial port sleep – A Sleep Mode setting
wherein the module runs in a low power
state until data is detected on the DI pin.
This setting must be enabled using the SM
command.
Sleep Mode – A mode of operation in which
the 24XStream enters a low power-
consuming state. Several Sleep Mode