FreeWave Technologies Inc. 218151431519 用户手册

760 Mhz Data Transceiver Users Manual 

LUM0000XX Rev A 

Version 1.0 

26 

When installing MultiPoint networks it is important to do some up front planning. Unlike Point-to-Point 
networks, a Point-to-MultiPoint network requires several parameters are set consistently on all 
transceivers in the network. This includes RF data rate, Min and Max Packet Size, and FreqKey. 

Note:   If several independent MultiPoint networks are to be located in close proximity the planning 

becomes more critical. In such cases, it becomes very important to include as much frequency 
and time diversity as possible through use of different FreqKey, Min and Max Packet Size, and 
Hop Table settings. In some instances the use of the MultiMaster Synch option may be required.  

Edit MultiPoint Parameters  

 

Selecting (5) Edit MultiPoint Parameters from the main menu displays the following window: 

Repeaters are not available in the FreeWave LRS-760 Data Transceivers. 

In a Point-to-MultiPoint network, Slaves do not acknowledge transmissions from the Master. If Slaves did 
acknowledge all data transmissions, in a large network, the Master would soon become overwhelmed 
with acknowledgments from the Slaves.  Without acknowledgements, 100% confidence every Slave has 
received every packet cannot be met. To address this issue, the user may modify the Master Packet 
Repeat setting, assigning a value between 0 (the packet is transmitted once) to 9 (the packet is 
transmitted 10 times). For networks with solid RF links, this parameter should be set to a low value such 
as 1 or 2. If a network has some weak or marginal links it should be set with higher values. If a Slave 
receives a good packet from a Master more than once it will discard the repeated packets 

Increasing the Master Packet Repeat setting will increase the probability of a packet getting through, but 
will also increase latency in the network because each packet from the Master is being sent multiple