FTS SDI-RADAR-300W User manual

EXTREME ENVIRONMENTS. EXTREMELY RELIABLE.
SDI-RADAR-300W
Surface Flow Velocity Radar
Operating Manual
1.800.548.4264 | www.ftsinc.com
700-SDI-RADAR-300W-Man Rev 2 30 May 2022
Part# 21370

Contact Information
Canadian Headquarters:
1065 Henry Eng Place
Victoria, BC | V9B 6B2 | Canada
www.ftsinc.com
Toll-free: 1.800.548.4264
Local: 250.478.5561
Technical support portal: http://support.ftsinc.com
Email: [e-mail]

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Content
1.1 APPROPRIATE USE ..................................................................................................................................... 1
1.2 GENERAL SAFETY INSTRUCTIONS............................................................................................................ 1
2.1 FUNCTIONAL PRINCIPLE ........................................................................................................................... 2
2.2 INTERFERENCE AND MULTIPLE RADARS................................................................................................. 2
2.3 CONNECTOR PIN-OUT AND WIRING ....................................................................................................... 3
2.4 ELECTRICAL CHARACTERISTICS................................................................................................................ 4
3.1 INSTALLATION POSITION.......................................................................................................................... 5
3.2 RAIN AND WIND......................................................................................................................................... 6
3.3 FOGGING AND EVAPORATION ................................................................................................................. 6
3.4 REFLECTIONS.............................................................................................................................................. 7
4.1 SERIAL INTERFACES ................................................................................................................................... 8
4.1.1 SERIAL RS-232 INTERFACE............................................................................................................... 8
4.1.2 SERIAL RS-485 INTERFACE............................................................................................................... 8
4.2 DATA PROTOCOLS ..................................................................................................................................... 8
4.2.1 NMEA PROTOCOL (RS-232) ............................................................................................................. 9
4.2.2 SERVICING PROTOCOL (RS-232) ..................................................................................................... 9
4.2.3 REQUEST-RESPONSE PROTOCOL (RS-485).................................................................................. 11
4.2.4 MODBUS PROTOCOL (RS-485)...................................................................................................... 12
4.2.5 SDI-12 PROTOCOL.......................................................................................................................... 17
5.1 CONNECTING THE RADAR TO THE CONFIGURATOR........................................................................... 23
5.2 SURFACE VELOCITY RADAR SETTINGS................................................................................................... 25
5.2.1 INTERFACES..................................................................................................................................... 25
5.2.2 processes ........................................................................................................................................ 28
5.2.3 MEASUREMENT .............................................................................................................................. 31

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A.1 ELECTRICAL CHARACTERISTICS .............................................................................................................. 35
A.2 CONNECTING TO THE SDI-RADAR-300W .............................................................................................. 35
A.3 TROUBLESHOOTING SDI-12 ADAPTER ERRORS................................................................................... 37

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SAFETY
1.1 APPROPRIATE USE
Operational reliability is ensured only if the instrument is properly used according to the
specifications in this manual as well as possible supplementary instructions.
WARNING: Inappropriate or incorrect use of the instrument can give rise to
application specific hazards, e.g., damage to system components through
incorrect mounting or adjustment.
1.2 GENERAL SAFETY INSTRUCTIONS
This is a state-of-the-art instrument complying with all prevailing regulations and guidelines.
During the entire duration of use, the user is obliged to determine the compliance of the necessary
occupational safety measures with the current valid rules and regulations for their area.
The safety instructions in this manual, the national installation standards as well as the valid safety
regulations and accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device beyond that described in the
operating instructions manual may be carried out only by personnel authorized by the
manufacturer. Arbitrary conversions or modifications are explicitly forbidden.
The safety approval markings and safety tips on the device must also be observed.

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PRODUCT DESCRIPTION
2.1 FUNCTIONAL PRINCIPLE
The SDI-RADAR-300W flow meter, referred to as the 300W in this manual, uses radar technology to
provide precise contactless measurement of surface flow velocity. Contactless radar technology
enables quick and simple sensor installation above the water surface and requires minimum
maintenance. This functionality is achieved by transmitting an electromagnetic wave in the 24
GHz frequency range (K-band) and measuring the frequency shift of the electromagnetic wave
reflected from the flowing water surface. The frequency shift is caused by the Doppler effect of
the moving surface on the electromagnetic wave. As the relative speed between the radar
sensor and the water surface increases, the detected frequency shift also increases, thus
enabling the flow meter to precisely determine the surface flow velocity.
The 300W reports the average surface velocity of the area covered by its beam and uses
complex Kalman filters with physical modelling of the water flow to give stable measurements
even under turbulent conditions. However, moderate waviness of the water surface will
improve the measurement (see Section 3.4). In strongly turbulent water flow, fluctuations in
measured data could be expected as well as somewhat reduced measurement accuracy. If
strongly turbulent flow can be expected at monitoring site, then the filter length of the radar
should be configured to 120 or more.
The flow meter is able to detect water flow traveling at speeds ranging from 0.02 m/s to 15.0
m/s with precision of 0.01 m/s1. The integrated tilt sensor measures the inclination angle of
the sensor and the flow velocity measurement is automatically cosine-corrected according to
the measured mounting tilt angle.
2.2 INTERFERENCE AND MULTIPLE RADARS
The 300W operates in K band, in frequency range around 24.125 GHz. Frequency stability and phase
noise of the internal oscillator is very good and always trimmed in factory to a precise central
frequency making the likelihood of two devices working on the exact same frequency to cause
interference highly unlikely. The Doppler frequency shift caused by water in the speed range up to
15 m/s is measured in kHz frequency shift. As this frequency shift is relatively small in comparison
to the central frequency, in most cases below 0.00005%, it will be required to keep the difference
between central frequencies of two radars in the same range to get interference.
Similarly, is very unlikely that other radiation sources in the K band in the vicinity will affect the 300W
measurements. Some wideband radiation sources can introduce small impulse interference for a
short period of time, but this is very unlikely to affect measurements reported by the radar.
10.04 mph to 33.55 mph with a precision of 0.02 mph

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2.3 CONNECTOR PIN-OUT AND WIRING
The sensor is supplied with an M12 connector and cable. The connector and cable details are
shown on Figure 2-1. The user is responsible for connecting the sensor to the data collection
platform using the flying leads. Users can attach their own connector, connect the cable via a
terminal strip, or wire it directly to device electronics. Refer to Table 2-2 for wiring details.
Figure 2-1: Flow meter connectors
Table 2-2: Connector and Cable Pin-out
PIN #
COLOUR
PIN NAME
PIN DESCRIPTION
1
White
GND This pin should be connected to the ground (negative) pole of
the power supply
2
Brown
+Vin
Power supply. Power supply voltage must be 9 to 22 VDC,
and the power supply must be able to provide at least 0.65W.
3
Green
RS232 – TxD
RS-232 data transmit signal.
RS232 connections only used
when configuring the 300W
sensor with the Geolux
Instrument Configurator
software (see Chapter 5)
4
Yellow
RS232 – RxD
RS-232 data receive signal.
5
Grey
GND
Signal ground.
6
Pink
CAN – H
CAN2.0B high signal
7
Blue
CAN – L
CAN2.0B low signal
8
Red
V+ Output power supply (=Vin) for supply of external optional
equipment and for use with analog 4-20 mA output
9
Orange
RS485 – D-
RS-485 data transmitter/receiver low signal.
10
Dark Red
RS485 – D+
RS-485 data transmitter/receiver high signal.
11
Black
Alarm1 SW Alarm 1 – open collector switch signal max. 60mA (optional)
12
Purple
4-20 mA Sink for 4-20 mAanalog interface. Connect sensing device as
pull-up to sink the current

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2.4 ELECTRICAL CHARACTERISTICS
The electrical characteristics of the 300W flow meter are given in Table 2-1:
Table 2-1: Electrical Characteristics
PARAMETER
MIN
TYPICAL
MAX
UNIT
Communication interface:
RS-232 interface speed
RS-485 interface speed
1200
1200
115200
115200
bps
bps
Radar Sensor
Frequency
Radiated power (EIRP)
Sensitivity
Beamwidth (3dB) – Azimuth
Beamwidth (3dB) – Elevation
24.75
−
-108
−
−
24.125
−
-110
12
24
24.175
20
-112
−
−
GHz
dBm
dBm
degrees
degrees
Power supply voltage
9.0
12.0
27.0
V
Power
Operational Mode
Sleep Mode
−
−
950
85
−
mW
mW
Alarm output maximal current −−60 mA
Alarm output maximal voltage −−30 VDC
Analog output maximal voltage
−
−
30
VDC
Operational temperature range
-40
(-40)
−
+85
(+185)
⁰C
°F
Measurement range
0.02
(0.04)
−
−
15.00
(33.55)
m/s
(mph)
Resolution −
−
0.001
(0.002)
−
−
m/s
(mph)
Accuracy
−
1
−
%
Angle compensation 0 30 75 degrees
Distance 0.1
(0.33)
−
−
50
(164.04)
m
(feet)
Sample Rate 10 sps
Ingress protection rating IP68 −−
Mechanical
−
110 x 90 x50
(4.33 x 3.54 x 1.97)
−
mm
(in)

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INSTALLATION
3.1 INSTALLATION POSITION
The flow meter must be installed above the water surface, pointing toward the water surface at a
vertical angle. Recommended minimum height above the water surface is 1 meter, with maximum
height up to 20 meters. Recommended vertical angle is 45 degrees. See Figure 3-1 for diagram and
Imperial units.
When selecting the installation location additional care must be taken to avoid reflected power away
from the radar (red arrow) to hit moving objects (gray cloud) on the side of the water channel as this
can cause additional inbound reflection to the radar and can significantly affect measurement
accuracy (refer to Figure 3-2). Installations where pedestrians, cars or other objects are moving in
front of the sensor closer than 75 m should be avoided as it is proven in practice that it can cause
problems.
To achieve the specified accuracy, it is important to properly select measurementsite and to install
sensor with proper horizontal and vertical tilt angle. The tilt angle to horizontal plane for surface
velocity sensor should be between 30° and 60°, and if instrument is mounted with reasonable
tolerances to the pole this should be maintained.The instrument should be oriented in parallel
with the water flow direction. For optimal operation, and best results. Any deviation from parallel
water flow direction will introduce offset of the real measurement value, more precise value will
be lower than actual surface velocity of the water. It is recommended that the instrument is
pointed upstream, so that the water flows towards the instrument.The height of the instrument
above the water surface and the inclination determine area on the surface that is covered by
the radar beam. This measurement area should be clear of any obstacles. The structure holding
the instrument (pole, bridge fence, etc.) must be solid and without vibrations. There should be
no vegetation between the radar and the measurement area because it could affect measurement
accuracy.
The water surface direct below the sensor should be clean of vegetation, rocks, sand
deposition or other obstacles that could affect measurement.
Surface velocity radar beam will cover an elliptical area on the water surface. The radar reports
average surface velocity of the covered area and instrument uses complex Kalman filters with
physical modelling of the water flow to give stable measurements even under turbulent conditions.
However even the moderate waviness of the water surface will improve the measurement, if the
water flow is strongly turbulent, fluctuations in measured data could be expected as well as
somewhat reduced measurement accuracy. If strongly turbulent flow can be expected at
monitoring site, then the filter length of the radar should be configured to 120 or more.
Additional information can be found at:
https://geolux.ams3.cdn.digitaloceanspaces.com/documents/Surface-Velocity-Measurement.pdf

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Figure 3-1: Flow meter installation position
3.2 RAIN AND WIND
The 300W has integrated internal software filters to filter out effects of rain, fog or wind. However,
these filters have some limitations imposed by environmental conditions (i.e. precipitation). The
majority of measurement inaccuracies caused by environmental factors can be solved by proper
sensor installation.
For rain and snow suppression, the most effective solution is to mount the radar so that the flow
meter points upstream and the water flows towards the radar. As rain falls down and the radar is
tilted downwards, rain droplets will move away from the radar, while the water flows towards the
radar. The radar can then easily distinguish the water movement from rain movement. To further
improve rain filtering, the radar should be configured to report only incoming direction of water
flow. In this case, the radar will completely ignore all movement with direction going away from the
sensor.
The influence of the wind on the accuracy of measured data is, in most cases, small and can be
neglected. The only exception is strong wind as it will create surface waves that are traveling in a
different direction from the water flow. This can affect surface measurement accuracy.
3.3 FOGGING AND EVAPORATION
Generally, radar sensors are not affected by fog or evaporation. However, heavy evaporation with
high water density in the atmosphere can affect measurement accuracy. A very high amount of
evaporation can introduce reflections and can affect surface velocity measurements.
The best solution for surface velocity measurements in heavy evaporation is to use the outbound
flow direction and to configure the sensor with only the downstream directional filter. As
(3.28 ft – 65.6 ft)

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evaporation is traveling upwards from the water surface, using the directional filter for water that is
inbound or approaching to the radar will solve the problem in most of the cases.
3.4 REFLECTIONS
Water is very reflective medium for the radar waves and most of the power transmitted from the
radar transmitter will be reflected from the water surface. Reflections of the radar transmitted
power beam follow the same physical laws as in optics in that part of the power is reflected towards
the radar, part of the power is reflected away from the radar, and a small part of power is absorbed
by the water. Depending on the surface roughness, the incident angle ratio between power
reflected away from the radar and towards the radar can significantly vary.
The situation for reflected power for the 300W radar is complex as it depends on the angle between
the transmitted radar beam (yellow arrow) and the water. In calmer conditions, most of the power
is reflected in the opposite direction from the radar (red arrow). Reflection in the direction of the
radar sensor (blue arrow) is always smaller and can be comparable with the dispersed power in all
directions (gray arrows). However, generally, a rougher water surface will lead to a stronger
reflection being returned to the radar and a greater SNR (signal to noise) ratio which enables more
accurate measurements. The 300W radar is designed to achieve accurate measurements even in
environments with very small SNR so the required surface roughness of 1mm is usually enough for
precise measurements.
Figure 3-2: Reflected power

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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

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4) Modbus Protocol which responds to Modbus requests over the RS-485 data line
4.2.1 NMEA PROTOCOL (RS-232)
NMEA protocol is based on the standard protocol family widely used by the navigation equipment.
NMEA protocol is sentence oriented and is capable of sending multiple sentences with different
information. The sentence content is designated by the starting keyword which is different for each
sentence type. NMEA sentences are terminated with the checksum which makes this protocol
extremely reliable. NMEA protocol is single-direction protocol: data is only transmitted from the flow
meter.
At the RS-232 interface the device periodically outputs the following data sentences:
Direct flow measurement report: $RDTGT,D1,S1,L1*CSUM<CR><LF>
$RDTGT: The keyword sent on the beginning of each detection report. This sentence is
sent whenever there is detected flow.
D1: The detected flow direction (1 approaching, -1 receding).
S1: The detected flow speed (speed2is reported as speed*10).
L1: The detected level of the signal reflection from the water surface.
CSUM: The check sum of the characters in the report from $ to * excluding these
characters.
Average flow measurement report: $RDAVG,S1*CSUM<CR><LF>
$RDAVG: The keyword sent on the beginning of the report. This sentence reports
smoothed flow measurement. This is the preferred reading, since it filters
out minor fluctuations in flow speed reading due to waves.
S1: The detected flow speed (speed1is reported as speed*10).
CSUM: The check sum of the characters in the report from $ to * excluding these
characters.
Tilt angle report: $RDANG,A*CSUM<CR><LF>
$RDANG: The keyword sent on the beginning of each angle report. The angle report is
sent periodically, together with RDTGT report.
A: The measured tilt angle, in degrees, 0 being horizontal.
CSUM: The check sum of the characters in the report from $ to * excluding these
characters.
4.2.2 SERVICING PROTOCOL (RS-232)
The servicing protocol is used to retrieve and modify the device operating parameters. Various
device settings, such as unit system and filtering parameters are configured using this protocol.
Since NMEA protocol is one way (it only outputs the data), the servicing protocol is always active.
2In the radar sensor setting it is possible to select km/h, mph, fps, fpm or mm/s for the speed reporting

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Easy configuration is done using the PC application, Configurator utility. Details can be found in
Chapter 6. The servicing protocol used between the Configurator Utility and the flow meter device is
transparent to users.
The servicing protocol listens on RS-232 serial port for incoming requests, and on each received
request, it will answer back.
The following requests are recognized by the servicing protocol:
Change units type: Sets the units type in which the target speed is reported.
#set_units=kmh
#set_units=mph
#set_units=fps
#set_units=fpm
#set_units=ms
#set_units=mms
Change radar sensitivity: Changes the sensitivity of the radar sensor.
#set_thld=<0-100>
Change detected targets direction: Changes the parameter that specifies which flow direction
will be reported.
#set_direction=in
#set_direction=out
#set_direction=both
Change serial port baud rate: Changes the parameter that specifies the baud rate speed used
by serial communication line; the same value is used for both RS-232 and RS-485.
#set_baud_rate=9600
#set_baud_rate=38400
#set_baud_rate=57600
#set_baud_rate=115200
Change filter type: Changes the filter type used for flow averaging.
#set_filter_type=<1-2>
1=IIR filter;
2=moving average filter
Change filter length: Changes the window length (in samples) for moving average filter.
#set_filter_len=<1-1000>
Change default device orientation: Configure orientation of device mounting.
#set_rotation=<0-1>
0 = standard orientation
1 = 90 degree rotation (i.e. sideways)

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Set device ID: Configure the device ID. The ID is used as device identifier for RS-485 protocol.
#set_can_id=<0-99>
Automatic angle compensation: Enable/ disable the automatic compensation (cosine-
correction) of the tilt angle on the reported flow measurement.
#set_angle_compensation=<0-1>
0 = enable
1 = disable
Retrieve current device status: Requests the current device status.
#get_info
Example status output:
# firmware:4.3.12
# pga_gain:2
# units:mph
# thld:64
# direction:both
# baud_rate:9600
# can_id:2
# angle_compensation:1
# filter_enable:1
# filter_type:1
# filter_len:5
# sensor_rotation:0
4.2.3 REQUEST-RESPONSE PROTOCOL (RS-485)
A different data protocol is used on the RS-485 interface which allows the connection of multiple
units on a single RS-485 line. Before the units are connected on the single RS-485 bus, each unit
must be configured with a different device identifier. The device identifier is configured by using the
PC Configurator Utility. Refer to Chapter 4 for instructions.
The request-response protocol, unlike NMEA protocol, does not automatically report periodic flow
measurement readings. Instead, when the unit is polled from the data logger, it responds with the
current averaged flow velocity measurement.
The request is sent from the data logger to the flow meter:
<0x25> ID CSUM
0x25: The first byte sent in the request is % character. Its ASCII value in HEX is 0x25.
ID: Exactly two bytes long. This is the unit ID written as two ASCII characters.
For example, if the polled unit ID is 2, then ID will be sent as “02”. In HEX
representation it is the following two bytes: <0x30><0x32>.

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CSUM: Checksum, calculated by adding in modulo 256 the two byte values of the ID.
If the device ID is 2, then ID was sent as <0x30><0x32>.
Checksum is then 0x30+0x32 = <0x62>.
After receiving the request, if the device ID matches, the flow meter will respond with the current
averaged flow velocity reading:
<0xA5> ID SPEED CSUM
0xA5: The first byte sent in the response is byte with HEX value of 0xA5.
ID: Exactly two bytes long. This is the unit ID written as two ASCII characters.
For example, if the unit ID is 2, then ID will be sent as “02”. In HEX representation
it is the following two bytes: <0x30><0x32>.
SPEED: The speed readout in currently selected units, formatted as real (float) number
With exactly three digits after the decimal dot separator.
For example, if the current averaged speed is 5.7143, it will be reported as
5.714, or in HEX values: <0x35><0x2E><0x37><0x31><0x34><0x33>.
CSUM: Checksum, calculated by adding in modulo 256 the two byte values of the ID and
All byte values from the SPEED.
4.2.4 MODBUS PROTOCOL (RS-485)
When configured in Modbus operation mode, the unit responds to Modbus requests over the RS-
485 data line. The baud rate is configured through the PC application, and 1 stop bit, even parity,
8 data bits configuration is used.
Modbus registers that are accessed by Modbus protocol are 16-bit (2-byte) registers. Any number of
registers can be read or written over Modbus.
Modbus is a request-response protocol where a master (such as datalogger) sends out requests,
and slave devices (such as RSS-2-300 WL sensor) responds. The request and response format, with
example, is given in tables 4-1 through 4-4. In each request, the master can either ask the slave to
retrieve the value of one or more registers, or the master can set the value of one or more registers.
Each register holds one 16-bit value.
Table 4-1: Master Request Format
Name
Addr
Fun
Data start Addr
Data#of regs
CRC16
Length
1 byte
1 byte
2 bytes (H.L.)
2 bytes (H.L.)
2 bytes (L.H.)
Example
0X01
0X03
0X00
0X00
0X00
0X01
0X84
0X0A

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Table 4-2: Request Example
Name Content Detail
Address 0X01 Slave address(Sensor id)
Function
0X03
Read slave info
Data start Addr
0X00
The address of the first register to read (HIGH)
0X00
The address of the first register to read (LOW) – Sensor ID
reg
Data of regs
0X00
High
0X01
Low (read only 1 register)
CRC16
0X84
CRC Low
0X0A CRC High
Table 4-3: Slave (sensor) Response Format
Name Address Function Byte
count Data CRC16
Length
1 byte
1 byte
1 byte
2 bytes (H.L.)
2 bytes (L.H.)
Example 0X01 0X03 0X02 0X00 0X01 0X79 0X84
Table 4-4: Response Example
Name Content Detail
Address 0X01 Slave address (Sensor ID)
Function
0X03
Read slave info
Data length
0X02
Data length is 2 bytes
Data
0X00
Data high byte
0X01
Data low byte, means ID is 1
CRC16 0X84 CRC Low
0X0A CRC High
Table 4-5 defines the data returned by the unit when the master requests register read. Table 4-6
defines how to write the device configuration. Rows highlighted in blue denote the important values
measured by the sensor. Rows highlighted in red denote operating parameters that could be
changed in the field.

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Table 4-5: Retrieving Data from the Sensor
Function Data start
Addr
Data Length Data Range Detail
0X03
0X0000 2 bytes 1~255 Read sensor id
0X0001 2 bytes
0
→
9600
1→38400
2→57600
3→115200
Read baud rate
0X0002 2 bytes
0→mm/s
1→m/s
2→other
Read set units type
0X0003 2 bytes 0-15000 (mm/s) Read instantaneous speed
0X0004
2 bytes
0-15000 (mm/s)
Read averaged speed
0X0005
2 bytes
0-360
Read tilt angle
0X0006 2 bytes
0→IIR
1→Average Read averaging type
0X0007
2 bytes
1-512
Read averaging length
0X0008 2 bytes
0 →incoming
1 →outgoing Read flow direction
0X0009
2 bytes
0→both
1→incoming
2→outgoing
Read flow direction filter setting
0000A
2 bytes
0-100
Read sensitivity value
0X000B 2 bytes 0-2048 Read relative signal strength
0X000C
2 bytes
0→Normal
1→Rotated
sideways
Read preconfigured device placement
orientation (if it is rotated sideways or
not)
0X000D
2 bytes
451
Read firmware code 4.5.1
0X000E
2 bytes
0-8
Read defined gain sensitivity
0X000F 2 bytes
1,2,5,10,20,50,
100,200 Read current gain level
0X0010
2 bytes
0 – 65536
Read calculated water discharge
0X0011 2 bytes
0→ASCII64
1→NMEA
2→ASCIIV
3→AVIO
4→SDI12
Read RS-232 protocol type
0X0012 2 bytes
0→HS
1→MODBUS
Read RS-485 protocol type
0X0013 2 bytes 0 →Disabled
1 →Enabled
Is speed correction for tilt angle
enabled
0X0014 2 bytes
0
→
Sensor Err.
1 →Sensor OK Level sensor health indicator

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Table 4-5: Retrieving Data from the Sensor (continued)
Function Data start
Addr
Data Length Data Range Detail
0X03
0X0015 2 bytes 0-15000 Read measured water level (in
millimeters from the sensor)
0X0016 2 bytes From -32768
To 32,767
Read predefined radar height (in cm,
relative to arbitrary position)
0X0017 2 bytes 0-65535
Radar predefined radar horizontal
offset (in cm, from left shore)
0X0018 2 bytes 0-128
Read number of predefined points
that define channel geometry
0X0019 2 bytes 0-128 Read number of k-coeff values
0X001A
…..
0X0099
128*(2 byte) From -32768
To 32,767
Relative height (in cm) for each point
that defines a channel
geometry/profile (Y coordinate)
0X009A
….
0X0119
128*(2 byte) 0-65535
Relative vertical offset (in cm) for each
point that defines a channel
geometry/profile (X coordinate)
0X011A
….
0X0199
128*(2 byte) From -32768
To 32,767
Relative height (in cm) of the water
level for each defined k-coeff value
0X019A
….
0X0219
128*(2 byte) 0-65535
k-coeff values
Each k-coeff value is stored as val *
10000; so for k-coeff of 0.85, the
register would hold 8500.

700-SDI-RADAR-300W-Man Rev 2 30 May 2022 16/39
Part# 21370
Table 4-6: Writing Data to the Sensor
Function
Data start Addr
Data
Length
Data Range
Detail
0X06
0X0000 2 bytes 1 255 Change sensor id
0X0001 2 bytes
0→9600
1→38400
2→57600
3→115200
Change baud rate
0X0002 2 bytes
0→mm/s
1→m/s
Change data unit
0X0003 2 bytes
0→IIR
1→Average Change averaging type
0X0004 2 bytes 1-512
Change averaging length
0X0005 2 bytes
0→both
1→incoming
2→outgoing
Change flow direction filter type
0X0006
2 bytes
0-100
Change sensitivity level
0X06
0X0007 2 bytes
0→Normal
1→Rotated
sideways
Change device orientation
0X0008 2 bytes
0→ASCII64
1→NMEA
2→ASCIIV
3→AVIO
4→SDI12
Change RS-232 protocol type
0X0009
2 bytes
0→HS
1→MODBUS
RTU
Change RS-485 protocol type
0000A 2 bytes 0-8
Change PGA sensitivity
0X000B
2 bytes 0 →Disabled
1 →Enabled
Enable / disable tilt angle
compensation for surface
velocity reading
0X000C
2 bytes
0→Write params
1→Write points
2→Write k-coeffs
Change configured channel
profile info. Initiates writing
buffered data into device flash.
0X000D
2 bytes
From -32768
To 32,767 Radar height (Y)
Profile
parameter
buffer
0X000E
2 bytes
0-65535
Radar Offset (X)
0X000F 2 bytes 0-128
Number of
geometry points
0X0010 2 bytes 0-128
Number of
k-coeffs
0X0011 - 0X0090 2 bytes From -32768
To 32,767
Point Heights buffer OR
k-coeffs height levels buffer
0X0091 - 0X0110 2 bytes 0 – 65536
Point X offsets buffer OR
k-coeffs buffer