XE24S500 Datasheet, PDF (8/16 Pages) List of Unclassifed Manufacturers – Complete 2.4 GHZ FHSS Transceiver

XE24S500 COMMUNICATIONS CONTROLLER (continued)
Configuring for Sensor Operation
All SensorOnAir^™ functions are performed by the
XE24S500 communications controller. Modem-like
AT commands loaded through the serial interface,
program the functions of the analog and digital lines.
The configuration is then stored in Flash memory.
This allows the XE24S500 to be programmed and
then installed in the application.
SensorOnAir Commands^™
Below is a list of the commands and registers used
to program SensorOnAir^™ operation.
S107 - Defines the I/O lines. The two analog inputs,
ADC0 and ADC1, can also be defined as
digital I/O lines if needed. The four digital
lines, DIO0, DIO1, DIO2, and DIO3; can
be set as either inputs or outputs. The value
of this register is stored in flash memory.
AT&IAn? - This command allows a local host to
read the value of Analog Input “n.”
AT&IDn? - This command allows a local host to
read the status of Digital I/O “n.”
AT&IDn=z - This command allows a local host to
set the condition of the digital output “n.”
When z=0 the output is set to a logic low;
when z=1 the output is set to a logic high.
AT#IxxxAn? - This command allows the value of
Analog Input “n” on node address “xxx” to
be read remotely.
AT#IxxxDn? - This command allows the status of
Digital I/O “n” on node address “xxx” to be
read remotely
AT#IxxxDn=z - This command allows the state of
digital output “n” on node address “xxx” to
be set remotely. When z=0 the output is set
to a logic low; when z=1 the output is set to
a logic high.
WIRELESS COMMUNICATIONS
The communications controller manages the RF Link
including the frequency hopping algorithm; collision
avoidance, node addressing, and data packets. The
communications controller supports point-to-point,
point-to-multipoint or multipoint networks.
Carrier Sense Multiple Access (CSMA)
To prevent collisions between nodes, the XE24S500
uses a Carrier Sense Multiple Access protocol at
each transceiver. All nodes listen for link activity
before initiating a session. If a wireless link already
exists, the transceiver waits until that session is
complete before initiating a new wireless link.
Data Packets
Data presented by the system host is placed into
packets by the XE24S500 communications controller
for transmission across the wireless link. These
packets provide addressing and error correction for
the wireless communications. The received data
is extracted from the packets before being passed
to the serial interface.
XECOM
(8)
XE24S500