HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output

Product catalog summary

Overview: This document outlines the technical specifications and operational procedures for serial communication between a host PC or PLC and the HPS Precision Inclinometer using the ModBus protocol. It includes detailed specifications, procedures, and examples for device configuration and operation.

Specifications:

Default ModBus serial parameters are set to 38400 baud, 1 start bit, 8 data bits, no parity, and 1 stop bit. The baud rate can be adjusted to various settings including 115200, 57600, 38400, 19200, 9600, 4800, or 2400.
16-bit values are transmitted using Big Endian byte order.
The device address range is from 1 to 247, with a default address of 100. A maximum of 128 devices can be connected on a network.
All commands and responses incorporate a 16-bit CRC for error detection.

Procedures:

Reading and Writing Registers: ModBus Function Code 3 is used for reading registers, while Code 6 is used for writing. Specific register addresses are provided for parameters such as X Axis Angle, Sensor Temperature, and Tare Function.
Changing Baud Rate: This is achieved using special function code 0x6E and command code 0x8F, with the device updating the baud rate after a 250ms delay.
Changing Device Address: Use special function code 0x6E and command code 0x91 to modify the device address.

Frequency Response:

The sensor's frequency response can be adjusted using filter indexes ranging from 0.125Hz to 8Hz, utilizing a 2nd order Bessel low pass filter.

Examples:

Reading X Axis Angle: Provides an example command and response for reading the angle from the sensor.
Changing Device Address: Includes an example command and response for changing the device address from 100 to 1.
Changing Frequency Response: Demonstrates an example command and response for setting the frequency response to 1Hz.
Setting Tare Function: Offers an example command and response for setting the current position to zero.

Catalog excerpts

HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-1

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output Features • Single axis measurement from ±5 to ±60° • High resolution and accuracy. • Low temperature drift, with optional temperature compensation to further improve temperature performance. • RS232 and RS485 output versions. • RS485 version with multi-drop networked ModBus protocol and dual connectors • High precision robust corrosion resistant 316 Stainless Steel housing with IP67 sealing, and precision ground base • CE certified and RoHS compliant. • IP67 Sealed locking M8 connector • Small size, 70 x 49 x 18mm The HPS series inclinometers are high performance inclination sensors designed for use in the toughest environments. There are a wide range of options to cover a measurement range from ±5° to ±60°. The robust stainless steel housing is sealed to IP67 and utilises high performance sealed locking industry standard M8 connectors. The digital output can be selected as either RS232, RS485 or RS485 ModBus (for networked device connections). The device has inherently good temperature stability, but this can be improved further with optional temperature compensation over a range of different temperatures. The devices are CE certified and RoHS compliant. These devices are manufactured and calibrated in our UK factory to guarantee performance to the stated specification, and are built and configured to order on short lead times. General Specifications Level Developments Ltd. Croydon, Surrey, CR0 2DN t : +44 (0)20 8684 1400 [email protected] 97-99 Gloucester Road United Kingdom f : +44 (0)20 8684 1422 www.leveldevelopments.com

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-2

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 OutputPerformance Specifications Parameter

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-3

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output Housing Drawing for RS232 and RS485 Versions Axis Direction and Mounting Orientation Level Developments Ltd. Croydon, Surrey, CR0 2DN t : +44 (0)20 8684 1400 [email protected] 97-99 Gloucester Road United Kingdom f : +44 (0)20 8684 1422 www.leveldevelopments.com

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-4

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output Housing Drawing for Modbus Version The products are type approved to in accordance with the following directive(s): EMC Directive 2004/108/EC And it has been designed, manufactured and tested to the following specifications: BS EN61326-1:2006 Electrical equipment for measurement, control and laboratory use - EMC Requirements BS EN55011:2007, Group 1 Class B Level Developments Ltd. Croydon, Surrey, CR0 2DN t : +44 (0)20 8684 1400 [email protected] 97-99 Gloucester Road United Kingdom f : +44 (0)20 8684...

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-5

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output Connector Details for RS232 & RS485 Versions The fitted connection is a 4 pin Binder 768 series M8 panel plug. It mates with the straight female connector shown below. There are also a range of pre-moulded leads available. Mating cables and connectors can be purchased from us separately. The connections are shown in the table below. Connector Details for ModBus Version The 2 fitted connectors are both male plug & female socket M8 4 pin Binder 768 series panel mount connectors. These mate with a range of straight...

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-6

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output The frequency response of the sensor can be changed to any of the response times shown in the table by sending the appropriate RS232 command (see page 6) or RS485 ModBus command (see page 8). The digital filter is a 2nd order Bessel low pass filter algorithm. The sensor has a built in mechanical damping at 18Hz and 2nd order analogue filter with a 8Hz cutoff frequency, so specifying a filter frequency above this value will not increase the response beyond this amount. Part Numbering 05 - ±5° Full Scale Measurement...

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-7

Data is transmitted and received over RS232 in full duplex mode and for RS485 versions in half duplex mode. The default configuration is with the baud rate set to 38.4kbps, with 8 data bits, 1 stop bit and no parity. All commands are lower case and 7 bytes long. The time between each character of the command must be less than 100ms otherwise the device will discard the command. The settings are all stored in non volatile memory.

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-8

A free Windows based application for reading angle, logging and device configuration is available from our web site. It requires Windows XP SP3, Windows 7 or Windows 8, and works with 32 and 64 bit systems. It also requires the .net framework V3.5 or higher, and will prompt you to download and install this from Microsoft if it is not already installed on your system. A COM port is also required, and can either be a built in COM port, or a USB to Serial COM port. It is compatible with devices using the LD communication protocol as defined on page 6, it cannot be used with ModBus devices. • Automatic...

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-9

Data is transmitted and received over RS485 in half duplex mode using the ModBus RTU protocol. The following section provides some basic information about the serial communication between the host PC or PLC and the HPS. The full ModBus specification can be obtained from http://www.modbus.org. ModBus is a command/response protocol over a serial bus. The default ModBus serial parameters are: 38400 baud, 1 start bit, 8 data bits, no parity and 1 stop bit. The 8 data bits are sent LSB first. The baud rate can be changed to 115200, 57600, 38400, 19200, 9600, 4800 or 2400 by sending the appropriate...

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-10

level developments HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output Level Developments Ltd. Croydon, Surrey, CR0 2DN t : +44 (0)20 8684 1400 [email protected] 97-99 Gloucester Road United Kingdom f : +44 (0)20 8684 1422 www.leveldevelopments.com

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HPS Precision Inclinometer : Single Axis, RS232 & RS485 Output-11

Data can be written to some registers, such as the registers that store the filter indexes for each axis frequency response. Function code 0x06 is used to write these registers as detailed below. Level Developments Ltd. Croydon, Surrey, CR0 2DN t : +44 (0)20 8684 1400 [email protected] 97-99 Gloucester Road United Kingdom f : +44 (0)20 8684 1422 www.leveldevelopments.com

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