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ME-Messysteme GSV-2 Series User Manual

Strain gage bridge amplifier
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Strain Gage Bridge Amplifier GSV-2
Updated 14.11.2017
ME-Meßsysteme GmbH
Neuendorfstr. 18a
16761 Hennigsdorf
User's Manual
GSV-2LS, GSV-2AS, GSV-2FSD
GSV-2CAN, GSV-2TSD-DI
Tel.: +49 3302 89824 60
Fax: +49 3302 89824 69
Mail: info@me-systeme.de
Web: www.me-systeme.de

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  • Page 1 Strain Gage Bridge Amplifier GSV-2 User's Manual GSV-2LS, GSV-2AS, GSV-2FSD GSV-2CAN, GSV-2TSD-DI Updated 14.11.2017 ME-Meßsysteme GmbH Neuendorfstr. 18a Tel.: +49 3302 89824 60 Mail: info@me-systeme.de 16761 Hennigsdorf Fax: +49 3302 89824 69 Web: www.me-systeme.de...

  • Page 3: Table Of Contents

    Table of Contents Description............................5 Pin Configuration............................6 15 pole terminal block for the sensor connection...............6 5 pole terminal block for RS232 / RS422..................7 Backplate of the table case (GSV-2TSD-DI)..................7 Side panel GSV-2TSD-DI........................8 12-pole terminal block GSV-2TSD....................8 Connection scheme 12-pole terminal block.................9 15-pole SUB-D connector of the GSV-2TSD (-DI).................9 Connection diagram 15-pole SUB-D connector.................10 Connection and start-up........................10...
  • Page 4 Resolution............................62 Description of the jumpers / selectors..................64 Dimensions of the circuit board GSV-2L..................64 Dimensions of the aluminium housing of the GSV-2AS............65 Front panel cut out and housing of the GSV-2FSD..............66 Dimensions of the GSV-2TSD-DI....................66 Changelog............................66 ME-Meßsysteme GmbH Neuendorfstr. 18a Tel.: +49 3302 89824 60 Mail: info@me-systeme.de 16761 Hennigsdorf Fax: +49 3302 89824 69...

  • Page 5: Description

    Description The GSV-2 is a strain gauge measuring amplifier with a serial output signal. Depending on the type, the following interfaces are available: RS232, RS422, USB, CANbus / CANopen, Ethernet. The measuring amplifier GSV-2 is available in different housing models and equipment variants: GSV-2TSD-DI: Desktop housing with display, USB, RS232, and integrated, •...

  • Page 6: Pin Configuration

    Pin Configuration 15 pole terminal block for the sensor connection Figure 1: Terminal block 15pole and 5 pole in GSV-2LS, GSV-2AS, GSV-2ASD and GSV-2FSD Name Description Supply ground Connection for cable shield Positive bridge sensor supply The signals at terminals 2..7 are recorded by software in channel 0.

  • Page 7: Pole Terminal Block For Rs232 / Rs422

    5 pole terminal block for RS232 / RS422 Standard CAN/CANopen Description Ground RS232 / RS422 Interface Data connection Rx for RS232 / Rx- for RS422 Data connection Tx for RS232 / Tx- for RS422 CAN_GND Rx+ for RS422 Ground CAN bus CAN_L Tx+ for RS422 CAN low...

  • Page 8: Side Panel Gsv-2Tsd-Di

    Side panel GSV-2TSD-DI Five 2mm plugs are arranged at the side panel. Two isolated threshold outputs and one input for the tare / set zero functioa are available. black Set zero input Input voltage 9 .. 30 Volts green Threshold 1 CMOS relay outputs, isolated, 60 VDC, 40 VAC yellow...

  • Page 9: Connection Scheme 12-Pole Terminal Block

    Connection scheme 12-pole terminal block Figure 3: Connection of Full-, Half- and Quarterbridge sensors to the 12-pole terminal block 15-pole SUB-D connector of the GSV-2TSD (-DI) Name Description Shielding Cable shield Analogue input ground Tare Tare input / Trigger input Analogue input Analogue output Positive bridge sensor supply...

  • Page 10: Connection Diagram 15-Pole Sub-D Connector

    Connection diagram 15-pole SUB-D connector Table 5: Connection of Full-, Half- and Quarterbridge sensors to the 15-pole SUB-D connector All ground connections are individually protected by interference suppressor inductors in the GSV. Terminals are connected to the housing via interference suppression inductor. Currents above 1A between the terminals and the housing result in damage to the interference suppression inductor.

  • Page 11: Connecting The Serial Interface

    Sense wire - PIN 6 All cable shields should be connected to the metal of the cable entrance or to GND. The supply voltage must be connected to the PINs 14 (+) and 15 (GND) of the GSV-2LS, GSV-2AS, GSV-2ASD and the GSV-2FSD The analogue output transmits a signal which is proportional to the measured force.

  • Page 12: Commissioning Devices With Canopen Interface

    GND (2 with 3, 7 with 8, 1+6 with 4 as well as 5 with 5). Commissioning devices with CANopen interface For devices with CANopen interface the changing of settings via USB port or via RS232 interface is blocked. These settings via USB or RS232 will be however possible only with the switch off of the CANopen interface.

  • Page 13: Null-Balance Calibration

    For specific applications it may be necessary to adjust the measurement amplifier's input sensitivity. a) Enlargement of the input sensitivity and thus the measurement range to 3-5 mV/V, e.g. for using sensors with an output signal of 3.0 mV/V (mV output voltage per volt bridge excitation voltage).

  • Page 14: Using Switching Output

    Please note: if the so-called Logger Mode is activated via the configuration software, no null-balance calibration is performed with a high level at input T. A measurement value is sent via the serial interface instead. Using switching output The GSV-2 has two opto-decoupled, digital outputs (terminals 11 and 13). In the standard version, these outputs are configured as OpenCollector outputs.
  • Page 15 Menu entry level 1 Menu entry level 2 Menu entry level 3 strain gauges, all in longitudinal direction.³ Half bridge: Half bridge circuit with 2 single ➔ strain gauges, both in longitudinal direction.³ Quarter bridge: Quarter bridge circuit with one ➔...

  • Page 16: Advice

    Menu entry level 1 Menu entry level 2 Menu entry level 3 Options Set channel Number value 0 or 1 ➔ Set threshold on-threshold 1 / 2 Number value of the on- ➔ ➔ threshold No. 1 or 2 off-threshold 1 / 2 Number value of the off- ➔...

  • Page 17: Number Format

    Number format To set the number value and the date or the time move with a short press of OK the cursor to the right and with MENU the cursor to the left. The number above the cursor is blinking and can be increased or reduced with UP / DOWN buttons.

  • Page 18: Display Settings

    From Firmware-Version 1.3.06 on, the status-byte contains in bits 3 and 4 information about the state of the threshold switches SW1 and SW2. Bit 7 Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 Bit 0 Res. Res. Res.

  • Page 19: Output Of The Register Data

    Example: normal load of the load cell: 100kg rated output of the load cell: 2 mV/V Input sensitivity of the strain gage amplifier: 2 mV/V ==> scaling factor = 100 Output of the register data After requesting the data, the answer frame sent begins with a semicolon as a prefix. From 2 up to 8 data bytes are getting transmitted in the frame depending on the size of the register.

  • Page 20: Table Of Commands

    Table of commands Note: the command number must be sent as Byte to GSV-2, followed by parameter-bytes. ( the command consist of 1 byte, followed by parameter-bytes). Command Command Command name Number of Number of data bytes parameters send by the GSV (Hexadecimal) reset status read scale...
  • Page 21 Command Command Command name Number of Number of data bytes parameters send by the GSV (Hexadecimal) get poisson set bridge type get bridge type Set Range get range reserved get offset wait get options reserved reserved reserved reserved get value clear maximum value set Digits get Digits...
  • Page 22 Command Command Command name Number of Number of data bytes parameters send by the GSV (Hexadecimal) Get Auto-Zero Counter Set User-Text Char 1) reserved Set User Offset Value Get User Offset Value³ reserved reserved SetAdaptFilterMask³ GetAdaptFilterMask³ SetAdaptFilterOptimize³ GetAdaptFilterOptimize³ Read Ranges reserved Get Sensor Capacity Set Sensor Capacity...

  • Page 23: Description Of The Commands

    Description of the commands Comment: For most of the commands described in this chapter there are public dll functions with almost the same name within a Windows-DLL named megsv.dll (they are described in the programming manual). Below there are useful tips to understand the direct RS 232-commands.
  • Page 24 Possible error codes: 0xA0, 0x91 Read offset Command number: 4 number of parameters: 0 Bytes sent by the GSV: 2 Read offset determines the offset setting of the analog front end of the amplifier. The value received can be send back with write offset . Possible error codes: 0xA0, 0x91 Write scale Command number: 5...
  • Page 25 Affected register: Channel, frequency, gain, polarity. Value Range: 0x00.00.00..0xFE.76.FF possible error codes: 0xA0,0x53,0x54,0x58,0x71 write offset Command number: 8 Number of parameters: 2 Bytes sent by the GSV: 0 Write offset sets the Offset configuration of the preamplifier. The bytes sent should contain a value which was recently determined with read offset.
  • Page 26 configuration of the GSV is automatically saved. You can restore the configuration set with get all. Value Range: 0x02..0x07 Possible error codes: 0xA0,0x54,0x55,0x74,0x71 Set cal Command number: 11 Number of parameters: 0 Bytes sent by the GSV: 0 Set cal accomplishes an internal sensitivity calibration of the AD converter. After this calibration you are operating with the amplification selected by set gain.
  • Page 27 updated. After a zero point adjustment with set zero this operation is able to calibrate the amplifier to the full load of the sensor, so the sensor must be loaded with its nominal load, while executing Set Scale. This command has no affect on the analog output. Attention: Don't accomplish Set scale (with a normal load) if no zero point calibration with set zero (without load) was done before.
  • Page 28 N/mm² ° km/h m³/h °C °F m/s² Value range: 0x00..0x2A Possible error code: 0xA0,0x54,0x71 Set norm Command number: 16 Number of parameters: 3 Bytes sent by the GSV: 0 Set norm sets the scaling factor for the measuring values shown in the LC display, see chapter “Display settings”...
  • Page 29 Set frequency Command number: 18 Number of parameters: 2 Bytes sent by the GSV: 0 With Set frequency the measuring data rate of the GSV can be set. Frequencies between 0,3125 Hz and 2000Hz can be selected. For example: At a data range of 100 Hz, 100 values per second will be sent via the serial interface.
  • Page 30 Set gain Command number: 19 Number of parameters: 1 Bytes sent by the GSV: 0 Set gain sets the amplification of the AD-converter of the GSV as shown in the following table, which indicates the resulting value of the input sensitivity of the bridge input. The Gain-Parameter 2 is the normal-input sensitivity, it means that the amplification of the AD- converter is 1.
  • Page 31 Set unipolar Command number: 21 Number of parameters: 0 Bytes sent by the GSV: 0 Set unipolar sets the GSV in the unipolar mode (the measured value 0 correspondents to the data value 0). Possible error codes 0xA0,0x71 Read Frequency Command number: 22 Number of parameters: 0 Bytes sent by the GSV: 3...
  • Page 32 Get dpoint determines the decimal point, as described in set dpoint. Possible error codes 0xA0,0x91 Switch Command number: 29 Number of parameters: 1 Bytes sent by the GSV: 0 Switch switches the switch output corresponding to the parameter byte, which is either on (1) or off (0).
  • Page 33 Possible error codes 0xA0,0x91 Set channel Command number: 34 Number of parameters: 1 Bytes sent by the GSV: 0 Set channel Sets the analogue input channel of the AD- Converter and restores the operating parameters previously stored for this channel. Channel=0 : bridge input (terminals 2..7) Channel=1...
  • Page 34 operating parameters, this mode remains as it is even after turning the amplifier off. Before you change particular bits of the mode-register you should to read it with get mode, change the bits as desired and write the byte back (read-modify-write). You can only change bits 1..5.
  • Page 35 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 AnaFilt = 1: Liquid Crystal Display installed = 1: Analog-Digital-Converter (always) existing = 1: GSV is intended for use as strain indicator AnaFilt: =1: Switchable analogue input filter available reserved, not defined Possible error codes 0xA0,0x91 Firmware version...
  • Page 36 Possible error codes 0xA0,0x54,0x7 Get poisson Command number: 47 Number of parameters: 0 Bytes sent by the GSV: 1 Get poisson reads the poissons ratio as described in Set Poisson. Possible error codes 0xA0,0x91 Set bridge type Command number: 48 Number of parameters: 1 Bytes sent by the GSV: 0 Set bridge type sets the bridge type of the strain gage sensor, with which the display scaling...
  • Page 37 Possible error codes 0xA0,0x50,0x56,0x71 Get range Command number: 51 Number of parameters: 0 Bytes sent by the GSV: 1 Get range reads the input sensitivity of the analog input stage of the GSV21, that means that the position of the jumper JP1 can be determined, too. The range register value is also relevant for the automatic calculation of the display scaling factor used by the command Calc norm.
  • Page 38 Possible error codes 0xA0,0x91 Clear maximum value Command number: 60 Number of parameters: 0 Bytes sent by the GSV: 0 Clear maximum value resets the actual maximum value, if the maximum mode is active (look at set mode), so that a new maximum value can be generated. Possible error codes 0xA0,0x71 Set Digits Command number: 61...
  • Page 39 Number of parameters: 0 Bytes sent by the GSV: 1 With get last error the the error status of the last command given can be determined. Every command – with the exception of Get last error itself – overwrites the error register. That is useful to determine the reason for the rejection of a write command.
  • Page 40 Bytes sent by the GSV: 0 Set second threshold set the threshold of the amplifiers second threshold switch (terminal No 13). The first two parameter bytes are the switch on threshold, the next two bytes are the switch off threshold,both with the MSByte first. The switch on threshold always needs to be bigger than the turn off threshold.
  • Page 41 protocol has 0xA5 as the prefix byte, then follows the measuring value as 16 bit value with the MSByte first. Higher data rates are possible with this protocol. Hardware Handshake may be better – in some cases even necessary – if the GSV-2s serial port is connected to a bus-system or a wireless transmitter.
  • Page 42 rate. If the jumper JP2 is set to the configuration mode, the communication bitrate is always 38400 bits/s, independently of the baud register value. The bitrate in the baud register applies only when jumper JP2 is removed. Possible error codes 0xA0,0x54,0x58,0x73,0x71 GetBaud Command number: 131 Number of parameters: 0...
  • Page 43 NoiseCut: (only if available, see GetCommandAvailable, otherwise X): =1: Noise Supression enabled, see SetNoiceCutThreshold, command 148. The content of the low byte is shown in the table below: Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Unipolar- FIR_N5...
  • Page 44 measured data range = sample rate / averaging summand amount The value range of the averaging summand is from 1 to 11. Parameter 1: Number of averaging summands Parameter 2: High byte of the Sampling-Rate-Register Parameter 2: Low byte of the Sampling-Rate-Register Parameter 1: Bits 6 und 7 must be =1.
  • Page 45 0x7F. Bits<7:0> (LoByte) are defined as follows: Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 CANon HasCAN =1 CANon =1: CAN-Interface enabled. The CAN-Interface can be switched on and off with this. When switched on, (CANon before =0), the CAN-Interface is „bootet“, which is signalled to the CANbus by putting the bootup-frame (TX-NMT) on the bus.
  • Page 46 falls das CAN-Interface an ist. Ist es aus, kommt die neue Node-ID beim Einschalten des CAN-Interfaces zur Wirkung, siehe CAN-Flags. Mögliche Fehlercodes: 0xA0, 0x71, 0x75, 0x51, 0x54, 0x55, 0x5A Get CAN Setting Befehlsnummer: 141 Anzahl der Parameter: 1 Vom GSV gesendete Bytes: 2 Mit Get CAN Setting können Einstellungen des CAN-Interfaces gelesen werden.
  • Page 47 3,5Hz, 1.order; from 260Hz on: 2.order 260Hz, 1. order; from 1,7kHz on: 2. order 1,7kHz 1. order The parameter (1. parameter: Highbyte, 2. parameter: Lowbyte) is twice the amount of the desired cut-off frequency. The cut-off frequency closest to the parameters will be selected and setted.
  • Page 48 With Get Command Available it can be examined if commands and their corresponding functionality are existent with the device connected. Hereby the upper command number of the command range to be checked will be transmitted first and the lower command number as the second parameter.
  • Page 49 Bytes sent by the GSV: 3 With GetNoiseCutThreshold you can read the register described before. Possible error codes 0xA0,0x91, 0x41 Set AutoZero Counter (only if AutoZero existent) Command number: 150 Number of parameters: 2 Bytes sent by the GSV: 0 With Set AutoZero Counter the counter for the automatic periodic tare-function can be set.
  • Page 50 data for termination must be transmitted first with the adress <text length>. Then the last character of the text at adress < text length - 1> and so on until the first character of the text at adress 0. In case the text should begin shifted to the right, please fill up with blanks (0x20), so that at adress 0 there's a value of >...
  • Page 51 This special digital filter can be enabled or disabled with SetMode (Bit 5). It combines a moving average filter over up to 32 values with a quick step response of the measuring signal. „Moving average filter“ means that the filter is non-decimating, so the output data rate is equal to the input data rate.
  • Page 52 With the adaptive averaging filter any noise signal, e.g. present in an environment with harsh elecromagnetic interference can be filtered, that means attenuated. Start the self- learning phase with SetAdaptFilterOptimize with the filter enabled, while the noise signal is strong, but the wanted signal doesn't change significantly. A special functionality of SetAdaptFilterOptimize can be triggered with parameter =0x0000.
  • Page 53 GetAdaptFilterOptimize Command number: 161 Number of parameters: 0 Bytes sent by the GSV: 2 With GetAdaptFilterOptimize the number of remaining measuring values during the self- learning phase (as described above) can be read, until the self-learning phase is finished. This is useful to determine when that phase will be finished. As the self-learning is finished (or wasn't ever started), the answer to GetAdaptFilterOptimize is =0x0000;...
  • Page 54 Meaning of the Jumper-Group-ID bytes of answer: Value (Hex) Meaning 0x01 Jumper 1: position 1. if transfer param. =0: Jumper is in position 1 0x02 Jumper 1: position 2. if transfer param. =0: Jumper is in position 2 0x03 Channel 1 0xFF Error Possible error codes: 0xA0,0x59,0x91...
  • Page 55 Get Rated Output Command number: 166 Number of parameters: 0 Bytes sent by the GSV: 4 With Get Rated Output previously saved electrical characteristic value of the connected sensor can be read. The return parameter is thereby coded as floating point number to basic 10, whereby the first byte indicates exponent +1 and the bytes 2 to 4 the mantissa in High-endian order.

  • Page 56: Canbus / Canopen Protocol Of The Gsv-2-Canopen

    Get SensorText Assign Command number: 168 Number of parameters: 0 Bytes sent by the GSV: 2 With Get SensorText Assign information about the assignment of settings to the saved sensors and their names defined by user can be read. The answer contains two parameters, each is 1 byte big. The first byte is the assignment number.

  • Page 57: Bus-Termination

    Bus-termination Just behind the 15-pole terminal block there's a 2-pole pin-connector for the bus- termination. By closing these 2 pins with a jumper (1/10'' spacing) the bus-termination is enabled. Supported services 5 different mandatory RX-NMT objects for the state-management (see CiA 301) •...

  • Page 58: Send-Conditions For The 1St Tx-Pdo

    Bits 3..7: =0 With the GSV-2CANOpen, the Alarm Block is implemented as the threshold switch, whereby the measuring value is compared to a threshold and the threshold switching output is set on or off. The status of these switches are part of the Alarm Status. The Alarm Status Byte contains the following flags: Bit 0 (LSBit): Threshold switch 1 activated Bit 1: Threshold switch 2 activated...

  • Page 59: General Advices And Tips

    General advices and Tips Please attend the actual documents on: http://www.me-systeme.de/software.html The command number is transmitted as a single byte to the measuring amplifier. The command parameters and the return parameters are binary bytes and not numerical (ASCII-) values (e.g. the parameter „01“ means 0x01 and not 0x31). A Windows dynamic-link-library (MEGSV.DLL) to access all the features of the measuring amplifier is available, also a LabView example VI with dll-function wrapper-VIs.

  • Page 60: Technical Data

    Technical Data (At U = 12…26V DC in the nominal temperature range) Model GSV-2LS / GSV-2ASD / FSD /TSD Unit / remarks GSV-2AS Accuracy class analog digital Measuring ranges Analog output ±1 (JP1 set to pos.1, 5V Sensorspeisung) mV/V ±2 or ±3.5 (by software and JP1 to pos.2, 2.5V sensor mV/V supply) 0.125, 0.25, 0.50, 1.00, 2.00, 3.50 (by software)

  • Page 61: Canbus Interface

    Model GSV-2LS / GSV-2ASD / FSD /TSD Unit / remarks GSV-2AS of threshold switch 200mA / 30V 200mA / 30V Saturation voltage <1.0 <1.0 V DC maximum voltage (switch off) maximum current (switch on) On resistance DC 0.12 0.12 Ohms Off resistance TeraOhms insulation strength...

  • Page 62: Resolution

    Resolution By changing the data rate (amount of measuring values transmitted per second) the analogue filter is changed automatically by default, as well as the filter properties of the delta sigma A/D Converter. Because of the internal oversampling and filtering, normally the user doesn't need to perform extra filtering and averaging.
  • Page 63 Resolution in the measuring range „1mV/V“ (5V supply voltage, JP1 in position 1) The peak-to-peak resolution at a data rate of 10/s is at least 30,000 counts, without additional digital filter, if this resolution is defined as the ratio of the measuring range to the amplitude of the peak-to-peak values, with sensor input shorted (Measuring range / peak-to- peak deviation).

  • Page 64: Description Of The Jumpers / Selectors

    Description of the jumpers / selectors JP1: Changing the bridge supply voltage: position 1 (left): bridge supply voltage = 5V, input sensitivity = 1mV/V position 2 (right): bridge supply voltage = 2.5V, input sensitivity = 2 or 3.5mV/V (see Set/Get Range) Attention: the jumper has to be plugged! JP2: Configuration mode for baudrate and protocol settings Set: Configuration mode is enabled, Baudrate is fixed to 38400 Bits/s Not set: Configuration mode is disabled, the baudrate of the baudrate-register is valid (see...

  • Page 65: Dimensions Of The Aluminium Housing Of The Gsv-2As

    Dimensions of the aluminium housing of the GSV-2AS ME-Meßsysteme GmbH Neuendorfstr. 18a Tel.: +49 3302 89824 60 Mail: info@me-systeme.de 16761 Hennigsdorf Fax: +49 3302 89824 69 Web: www.me-systeme.de...

  • Page 66: Front Panel Cut Out And Housing Of The Gsv-2Fsd

    Front panel cut out and housing of the GSV-2FSD +1,0 Zero Dimensions of the GSV-2TSD-DI L x B x H: 200 x 175 x 75 mm Updated: 14.11.17 Version ba-gsv2-v1.3_en editor Holger Kabelitz Released by: Holger Kabelitz, 14.11.2017 Änderungen Changelog Seite 66 Changelog Version Datum...
  • Page 67 ME-Meßsysteme GmbH Neuendorfstr. 18a Tel.: +49 3302 89824 60 Mail: info@me-systeme.de 16761 Hennigsdorf Fax: +49 3302 89824 69 Web: www.me-systeme.de...
  • Page 68 Subject to change without notice. Every information describes the product in general. They are no assurance of features in the sense of §459 Abs. 2, BGB (German civil code) and assume no liability. Copyright ã 1999-2017 Made in Germany...

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