700-SDI-RADAR-300W-Man Rev 2 30 May 2022
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Part# 21370
DATA INTERFACES AND PROTOCOLS
4.1
SERIAL INTERFACES
The 300W Flow meter offers the following serial interfaces, for ease of integration with existing
SCADA/telemetry:
1)
Serial RS-232 interface
2)
Serial RS-485 interface
4.1.1
SERIAL RS-232 INTERFACE
Serial RS-232 interface is used for direct connection of a single flow meter unit with a computer. The
serial interface is used both for retrieving live flow measurements and for configuration of the flow
meter device. Easy configuration can also be done with the PC application (see Chapter 6 for details).
Default communication parameters are:
Bitrate: 57600 bps
Data bits: 8
Stop bits: 1
Parity: None
A NMEA-like communication protocol is used to deliver flow measurements over RS-232 interface.
Detailed description of the protocol is given in the Chapter 4.
4.1.2
SERIAL RS-485 INTERFACE
Serial RS-485 interface is used for connecting multiple flow meters connected on a single RS-485 bus
to a single data logger. The main difference from the protocol used over RS-232 interface is that the
flow measurements are not reported automatically but are instead reported only after being
requested by the master device (data logger unit). Detailed description of the protocol is given in the
Chapter 4.
Default communication parameters are:
Bitrate: 57600 bps
Data bits: 8
Stop bits: 1
Parity: None
4.2
DATA PROTOCOLS
The 300W supports the following data protocols
1)
NMEA protocol on RS-232 interface that constantly outputs the detected speed and
reflected signal power, and also the current measured tilt angle
2)
Servicing protocol on RS-232 interface for configuring the unit
3)
Request Response Protocol on RS-485 interface that allows multiple units to be used on a
single RS-485 bus
