LACROIX Sofrel S4W - RADIO RDRTU-2 Communication Module; RDRTU-2 Radio Modem Function; Connecting the RDRTU-2 Module

RADIO RDRTU-2 communication module
RADIO RDRTU-2 communication module
The Remote Terminal Unit permits utilisation of a license-free RDRTU-2 radio modem at 869 MHz
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This modem radio is operable up to 500 mW to communicate with other remote equipment as MODBUS master or
slave; the typical range is 5 km (and 10 km maximum).
It connects with a RS485 module; no other module should be used to power it.
3 types of HGAs are proposed to optimise transmission (depending on the application and the relief of the terrain.
A high-gain antenna allows better reception and lower transmission power.
Connecting the RDRTU-2 module
Grounding: coaxial cable provided with the RDRTU-2 module guarantees continuity between the connector chassis and
the cable screen. Using a cable longer than 1 metre requires connecting the screen of the coaxial to Ground
at both ends of the cable.
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RDRTU-2
Terminal strip
Cable mass
Mast to ground connection
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RDRTU-2 housing
N Type connector
1 metre
50 metres
RS485 Terminal strip
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Only available in countries where 869MHz frequency is allowed, check with country’s regulations.