700-SDI-RADAR-300WL-Man Rev 2 11 Apr Mar 2022
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Part# 21371
DATA INTERFACES AND PROTOCOLS
4.1
SERIAL INTERFACES
The 300 WL 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 unit with a computer. The serial interface is
used both for retrieving measurements and for configuring the device using the PC application (see
Chapter 5).
Default communication parameters are:
Bitrate: 9600 bps
Data bits: 8
Stop bits: 1
Parity: None
An NMEA-like communication protocol is used to deliver flow measurements over the RS-232
interface. Detailed description of the protocol is given in the Section 4.2.
4.1.2
SERIAL RS-485 INTERFACE
The serial RS-485 interface is used for connecting multiple flow meters 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: 9600 bps
Data bits: 8
Stop bits: 1
Parity: None
4.2
DATA PROTOCOLS
The 300 WL supports the following data protocols
1)
NMEA protocol on RS-232 interface that constantly outputs the detected speed,
reflected signal power, and 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
