Comptus A70H-USDC Ultrasonic Speed and Direction Compact Instruction Manual

Comptus A70H-USDC Ultrasonic Speed and Direction Compact

Product Information

• Product Name: A70H-USDC Ultrasonic Speed and Direction, Compact
• Description: The A70H-USDC is an ultrasonic sensor that measures wind speed and direction. It is a compact instrument that does not have any moving parts, requires no maintenance, and does not need on-site calibration.
• Applications: Building Automation and Controls, Environmental Monitoring, Data Collection
• Specifications: – Range: Wind Speed: 0-40m/s (60 m/s max.) –
• Resolution: Wind Speed: 0.01m/s – Accuracy: Wind Speed: >10m/s

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Product Usage Instructions

1. Before installation, it is recommended to read the manual carefully.
2. To enter the Settings mode, send the command `>*rn’ (Hex: 3E 2A 0D 0A).
3. Set the serial port configuration by sending the command `>CUS 9600 8-N-1rn’ (Hex: 3E 43 55 53 20 39 36 30 30 20 38 2D 4E 2D 31 0D 0A). The parameters for baud rate, data bits, parity, and stop bits can be adjusted accordingly.
4. Set the address by sending the command `>ID2rn’ (Hex: 3E 49 44 20 32 0D 0A). The address can be set from 1 to 255 in decimal format.
5. To manually exit the Settings mode, send the command `>!rn’ (Hex: 3E 21 0D 0A).
6. To reset the instrument, send the command `>RESETrn’ (Hex: 3E 52 45 53 45 54 0D 0A). After successful execution of this command, a soft reset will be performed.
7. All configuration changes (Command two and Command three) should be done after Command one. Inputs must be entered within 15 seconds, or the settings mode will automatically close. After successful input, the reset restart will begin after 15 seconds.
8. After configuring the instrument, send the command `>RESETrn’ (Hex: 3E 52 45 53 45 54 0D 0A) to perform a soft reset before the new settings can take effect. The carriage return line feed corresponds to HEX (0x0D, 0x0A).

The A70H-USDC is an ultrasonic sensor that measures wind speed and direction.

• The instrument does not have any moving parts, needs no maintenance, and no on-site calibration. To get the most
  out of your instrument, we recommend you read this manual carefully before installation.

• The instrument can be used with computers, data collectors or other acquisition devices that are compatible with the commu-nication format provided with the specific instrument you have purchased. Standard output is RS485 or SDI-12 output optional – consult factory.

APPLICATIONS

• Building Automation and Controls
• Environmental Monitoring
• Data Collection

SPECIFICATIONS

• Range:
  • Wind Speed: 0-40m/s (60 m/s max.)
  • Wind Direction: 0-360º
• Resolution:
  • Wind Speed: 0.01m/s
  • Wind Direction: 1º
• Accuracy: Wind Speed: >10m/s – <±0.2m/s of the current value
• Starting Threshold:
  • Wind Speed: 0.1m/s
  • Wind Direction: 0.1m/s
• Electrical:
  • Power Supply: 12-24 VDC
  • Output Signal: RS485 (MODBUS/NEMA-0183), SDI-12
  • Power Consumption: 24V @ 60 mA
• Operating Temperature: -30ºC to 70ºC
• Ingress Protection: IP65/NEMA4
• Storage Conditions: 10ºC to 60ºC @ 20% to 90% R.H.
• Materials: ABS Engineering Plastic
• Weight: 0.8 kg (1.75 lbs)
• Dimensions: 145mm x 138mm

INSTALLATION RECOMMENDATIONS

• The A70H-USDC is suitable for use in a wide range of environments and under normal operating conditions does not require field calibration or maintenance.
• Check regularly to ensure that the unit is not impacted by nearby equipment that may interfere with operation including radar or radio transmitters, marine engines, generators, etc. Maintain a distance of 2m or more from any radar scanner or radio antennas. Use the cables provided with the sensor for optimum performance. If the cable is cut or not properly connected EMC shielding may be compromised. A ground loop is not required if the unit is connected according to installation instructions. Ensure continuous power supply to the A70H-USDC to ensure proper operation.
• Avoid installation near obstacles. Mount on the prevailing wind side of structures whenever possible. Recommended mounting position is 10 meters above ground in an open area free from any obstructions. Open area is defined as the horizontal distance between the wind sensor and any obstacle being greater than 10 times the height of the obstacle. If mounted on a building the sensor should theoretically be installed at a height half again the height of the building. The length of a horizontal boom shall place the sensor at least twice the diameter/diagonal of the tower/mast. The boom needs to be mounted on the prevailing wind side of the tower/mast.
• It may not be practical or realistic to meet these recommendations. Do what makes sense. As a minimum, try to mount the sensor at least 10 feet above the highest part of the building and avoid obstacles that may influence the wind speed and/or direction.
• For detailed information on best practices for siting of meteorological sensors download this brochure from the World Meteorological Organization: https://www.weather.gov/media/epz/mesonet/CWOP-WMO8.pdf

LAND (STATIONARY) INSTALLATION

It is recommended to install the A70H-USDC on a vertical mast. The sensor base is suitable for mounting on a 1.5” EMT or 1.25” NPT pipe. The sensor base attaches to the sensor with three screws, then the sensor base can be secured to the vertical mast with 2 large U-bolts (supplied).

ALIGNMENT:
There is a small arrow molded into the top of the sensor indicating North to aid in positioning. Use a compass during installation to ensure proper alignment. This is important for accurate wind direction. For indoor use, the sensor can be installed on any plane to measure speed and direction of air movement.

ELECTRICAL CONNECTION

The connector is either a 4-pin for RS485 or 3-pin for SDI-12. Align the indent on the wire connector with the ridge in the connector on the base of the sensor. Push in, then screw the outer protective sleeve into place. Excessive force should never be used. Finger tightness is adequate for most applications.

Mobile Installation:
The arrow indicating North should face the forward position (bow or heading) of the vessel. Ensure the sensor is mounted on a vertical mast at least 2 meters away from surrounding objects that may disturb or restrict air flow.

Cleaning:
If dust collects on the instrument, it can be lightly brushed with a cloth using soft biodegradable lotion. Do not use dissolving reagents or solvents, and carefully clean to avoid scratching the surface of the instrument. Snow or ice should be gently brushed off. Any hard accumulation should be allowed to dissolve away through natural conditions. Do not use hard tools to remove ice or snow.

Service:
The instrument has no moving parts and does not require routine maintenance. If the sensor is opened or the safety seal is damaged, any warranty or calibration service will be voided. If there is any problem with the sensor contact Comptus for troubleshooting assistance, or a return authorization code.

OUTPUT CHARACTERISTICS

• The wind direction as reported by the A70H-USDC is shown in degrees of azimuth. Provided the instrument is properly mounted with the North orientation aligned, the azimuth angles go from 1 degree at just east of North to 359 degrees at just west of North.
• RS485 Communication Protocol (MODBUS)
• Communication parameters:
  • Baud rate: 9600;
  • Data bits: 8;
  • Stop bit: 1;
  • Parity: EVEN
• When the sensor receives the correct data frame, it replies with the corresponding content. If there is an invalid data frame, the sensor does not reply with any content. No reply is convenient for multiple sensors to go with 485 bus networking, avoiding data communication conflicts.
• Registers start at 0. For example: 03 Function code register 1 is 40001 in the actual register. Default address is: 01H

REAL TIME DATA

• Client sends: 01 03 00 00 00 04 44 09
• Weather station returns: 01 03 08 0002 0126 80AD4003 77E1

Instrument configuration (user can choose ASCII or Hex):

• Through the connection with the instrument, some parameters of the instrument can be configured, such as changing the communication address and changing the Baud rate. To make these changes you need to send the required commands in sequence as shown below.

• To set the address:
  ‘Command one’ => ‘Command three’ => ‘Command four’ => ‘Command five’

• To set the serial port configuration:
  ‘Command one’ => ‘Command two’ => ‘Command four’ => ‘Command five

Description of Return data format:

• Command One:
  • Enter the Settings mode
  • Sent: (ASCII) >*\r\n (Hex) 3E 2A 0D 0A
  • Response: (ASCII) \n>CONFIGURE MODE\r\n (Hex) 0A 3E 43 4F 4E 46 49 47 55 52 45 20 4D 4F 44 45 0D 0A
• Command Two:
  • Set the serial port configuration
  • Sent: (ASCII) >CUS 9600 8-N-1\r\n (Hex) 3E 43 55 53 20 39 36 30 30 20 38 2D 4E 2D 31 0D 0A
  • Response: (ASCII) >CMD IS SET\r\n (Hex) 3E 43 4D 44 20 49 53 20 53 45 54 0D 0A
  • Note: The CUS is required followed by the serial port parameters that will need to be set. If it is not followed by the parameters, the command becomes the current query configuration. (such as sent: ‘>ID\r\n’,Response:’ \n>COM USART SET : 9600 N-8-1\r\n’)
  • Note:
    There are two spaces in the ‘CUS 9600 8-N-1’ to note. ‘8-N-1’ separated by ’-‘ contains no spaces.

• Command three:

  • Set the address
  • Sent: (ASCII) >ID2\r\n (Hex) 3E 49 44 20 32 0D 0A
  • Response: (ASCII) >CMDISSET\r\n (Hex) 3E 43 4D 44 20 49 53 20 53 45 54 0D 0A
    Note: This 2 is the address you want to set (set according to the need, 1-255), which must be in decimal format. If “ID” is not followed by address, the command becomes the current query address (Such as sent: >ID\r\n, Re- sponse: ID(HEX): 02\r\n).

• Command Four:

  • Manually exit the Settings mode
  • Sent: (ASCII) >!\r\n (Hex) 3E 21 0D 0A
  • Responce: (ASCII) \n>NORMAL MODE\r\n (Hex) 0A 3E 4E 4F 52 4D 41 4C 20 4D 4F 44 45 0D 0A

• Command five: Reset

  • SEnt: (ASCII) >RESET\r\n (Hex) 3E 52 45 53 45 54 0D 0A

• After the instrument receives this command successfully a soft reset is performed.

• Any configuration changes, such as Command two or Command three must be done after Command one. Inputs must be entered within 15 seconds or the settings mode will automatically close. After inputs are successfully entered, the reset restart will begin after 15 seconds.

• After setting the instrument, “Command five” must be sent to make the instrument soft reset before the new set-tings can take effect.

• “\r\n” is the carriage return line feed, corresponding to the HEX (0x0D, 0x0A)\

ABOUT COMPANY

• Specifications are subject to change without notice.
• Installation Questions and Troubleshooting Contact sales@comptus.com
• Call +1 603-726-7500
• 1307 NH Route 175
• Campton, NH 03223

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