RSS-2-300W User Manual
4
RSS-2-300W Non-Contact Surface Velocity Radar
3.1. Serial RS-232 Interface
Serial RS-232 interface is implemented as standard PC full-duplex serial interface with voltage
levels adequate for direct connection to PC computer or other embedded devices used for
serial RS-232 communication.
In case the RS-232 interface is connected to standard DB-9 PC connector, TxD line (green wire)
is connected to pin 2 and RxD (yellow wire) is connected to pin 3. For proper operation of the
serial interface, additional connection of signal GND (grey wire) is required on pin 5 of the
DB-9 connector.
Picture 2. Serial RS232 DB-9 Cable
3.2. Serial RS-485 Interface
Serial RS-485 interface is implemented as standard industrial half-duplex communication
interface. The communication interface is short-circuit and internally overvoltage protected.
Depending on the receiving device, the interface can be used with only two wires (D+ dark red
wire & D- orange wire) while in some cases the ground connection (signal GND grey wire) is
also required. For more details please consult receiver specification.
Most common communication protocol used with RS-485 interface is Modbus-RTU but other
protocols are also available. Details of communication protocols are described later in this
user manual.
Optionally Geolux can supply a cable with DB-9 connector connected to the cable but this
must be specified as option when ordering the sensors.
Several communication protocols are available, and custom on request. Details of
communication protocols are described later in this user manual.
Summary of Contents for RSS-2-300W
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