WIRELESS CONNECTIVITY & SENSORS
User manual Thyone-I
on the frequency channel.
The module that is configured as repeater also supports the functions of a standard module.
Thus, it can receive data and can initiate the data transmission to other modules.
12.1. Setup of the network and repeater device
The repeater mode can be enabled by setting the
parameter to 2.
If the module is configured as repeater, the following notes have to be considered:
1. Requirements on the network:
a) The repeater devices have to be line-powered (no battery).
b) Depending on the data rate, each repeater should repeat a maximum of 2-5 packets
per second to give a good chance that the repeater is not busy with repeating when
already a new packet arrives for repetition. More packets per second will result in
more packet loss as the collision probability is increased.
c) If the network consists of several layers of repeaters, each layer adds additional
delays to the packet transmission.
d) To set-up the network all participants have to use the same
and
2. Information for the repeater device:
a) Acknowledgements (ACK) of successfully received packets are blocked. If an ACK is
requested by the sending module, the request is ignored. Furthermore, the repeater
does not request any ACK, when repeating a packet.
b) The "packet sniffer" mode cannot run at the same time as the module is in repeater
mode.
c) A time-to-live parameter is present in every packet. The repeater decrements the
TTL by one before forwarding the packet. The packet with a TTL value of zero is not
repeated.
3. Information for the sending and receiving devices:
a) The senders should send less frequently to avoid packet collision on the frequency
channel.
b) The repeater devices do not support the feature of ACKs for the successful reception
of the packets. Thus, the sender will never receive ACKs if requested.
c) Every repeater sends each packet only once. However, receivers can receive each
packet several times (sent by different repeaters), if there are packets of different
content in the network temporally close to each other. Thus, on the side of the
receiving device, a mechanism shall be implemented that detects and filters double
packets.
Order code 2611011021000
125
Version 2.3 , July 2022
