R70ER Ethernet Data Radio
July 07, 2023
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Transmit Power Levels
—The 900 MHz radios transmit at 500 mW (27 dBm) or 250 mW (24 dBm). The 250 mW mode reduces the radio's
range but improves the battery life in short-range applications. For 2.4 GHz models, this DIP switch is disabled. The transmit power for 2.4
GHz is fixed at about 65 mW EIRP (18 dBm).
Star Topology
—To configure your radios as a star topology, set one radio to be the controller (DIP switch 1 ON). Set all the other radios to be
peripheral radios.
XML Behavior
—The R70 Ethernet radio is programmed similarly to a DXM Controller and uses a standard XML configuration file to define its
settings. For troubleshooting purposes, or advanced use cases, the XML can be bypassed when the device is turned on. With the XML
bypassed, the R70 will receive its own IP address, either fixed or through DHCP, according to the DIP switch settings.
R70ER Network Topologies
In any radio network, there is one controller (Modbus client) radio and can be many repeater or peripheral (Modbus server) radios.
Simple point to point network for cable replacement applications
Client radio
Server radio
In this simple cable replacement application, the radio system knows all data originating at one end must be transmitted to the other end.
This allows the radio system to automatically correct for transmission problems and it also provides the greatest throughput. This is the
fastest configuration.
Controller configuration route to peripherals: DIP switches 1 ON, 2 ON
Peripheral configuration route to controller: DIP switches 1 OFF, 2 OFF
Point to point network with repeater for cable replacement applications
Client radio
Server radio
Repeater radio
In this simple cable replacement application with repeater, the radio system still knows all data originating at one end must be transmitted to
the other end. In this application, there are no Ethernet devices connected to the repeater(s). The system still corrects for transmission
problems, but it takes time to repeat the message. The network delay is double that of a system with no repeater.
Controller configuration route to peripheral: DIP switches 1 ON, 2 ON
Repeater configuration: DIP switches 1 OFF, 2 ON
Peripheral configuration route to controller: DIP switches 1 OFF, 2 OFF
Star network in broadcast mode configuration
Client
Server
Server
Server
Server
Server
Server
In this more complex star topology in broadcast mode, the controller radio at the center of the network can communicate to many peripheral
radios. A common example would be a PLC at the center communicating with many remote I/O systems. The star topology is slower than a
point-to-point network, but faster than a tree network.
© Banner Engineering Corp.
