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CL024 User Guide
Version 2.0
T
O
HEORY OF
PERATION
Network Topologies
Topology refers to the shape of a network, or the network's layout. The way different nodes in a network
connect to each other and how they communicate is determined by the network's topology. The CL024s
have a Server/Client communication protocol, which supports Point-to-Point and Point-to-Multipoint
topologies. All clients must be in range of the server to maintain network synchronization and all
communicating devices must be in range of each other. Communication between out-of-range devices is also
possible using repeaters or Host systems that can direct the data through a Daisy Chain type topology.
Note:
See the
RM024 Embedded Module User Manual
different topologies using the advanced API features in the RM024 family of radios.
Modes of Operation
The CL024 has three different operating modes:
Transmit/Receive Mode
Command Mode
If the transceiver is not communicating with another radio, it is in Receive mode actively listening for packet
from another transceiver. A transceiver enters Transmit or Command mode when the OEM host sends data
over the serial interface. The contents of the data on the serial interface determine which of the two modes
the radio enters.
Transmit/Receive Mode
All packets sent over the RF are either Addressed or Broadcast packets. You may dynamically control
Broadcast and Addressed delivery with the API Control byte, which can be modified during operation with
On-the-Fly commands (for more information on APIs and on-the-fly commands, see the RM024 Embedded
Module User Manual). To prohibit transceivers from receiving broadcast packets, Unicast only can be enabled.
When a radio has data to transmit, it will transmit it at the next available data slot.
When sending an addressed packet, the RF packet sends only to the receiver specified
Addressed Packets
in the destination address. To increase the odds of successful delivery, Transmit Retries
are utilized. Transparent to the OEM host, the sending radio sends the RF packet to the
intended receiver. If the receiver receives the packet free of errors, it returns an RF
acknowledge within the same 13.2 ms hop. If a receive acknowledgement is not
received, the radio uses a transmit retry to resend the packet. The radio continues
sending the packets until either (1) it receives an acknowledgement, or (2) it has used
all transmit retries. The received packet only sends to the OEM host if and when it is
received free of errors.
When sending a broadcast packet, the RF packet sends out to every eligible transceiver
Broadcast Packets
on the network. To increase the odds of successful delivery, Broadcast Attempts are
utilized. Transparent to the OEM host, the sending radio sends the RF packet to the
intended receiver(s).
Unlike Transmit Retries, all Broadcast Attempts are used regardless of when the RF
packet is actually received and without RF acknowledgements. If the packet is received
on the first attempt, the receiver ignores the remaining broadcast attempts. The
received packet is only sent to the OEM host if and when it is received free of errors.
Americas: +1-800-492-2320 Option 2
Europe: +44-1628-858-940
Hong Kong: +852-2923-0610
wireless.support@lairdtech.com
www.lairdtech.com/ramp
for more detailed information about setting up
6
CONN-GUIDE-CL024
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