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ME-Messysteme GSV-2LS User Manual

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Strain Gage Bridge Amplifier GSV-2
User's Manual
GSV-2LS, GSV-2AS, GSV-2FSD
GSV-2CAN, GSV-2TSD-DI
Update 15.03.2016

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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 Update 15.03.2016...

  • Page 2: Table Of Contents

    Table of Contents Pin Configuration........................4 15 pole terminal block for the sensor connection..............4 5 pole terminal block for RS232 / RS422................5 Backplate of the table case (GSV-2TSD-DI)..............5 Side panel GSV-2TSD-DI....................6 12-pole terminal block GSV-2TSD..................6 Connection scheme 12-pole terminal block..............6 15-pole SUB-D connector of the GSV-2TSD (-DI)............7 Connection diagram 15-pole SUB-D connector..............8 Connection and start-up......................8 Connecting the sensor.......................8...
  • Page 3 Dimensions of the GSV-2TSD..................67 Front panel cut out and housing of the GSV-2FSD............67 ME-Meßsysteme GmbH, Neuendorfstr. 18a, D-16761 Hennigsdorf Germany Phone 03302 78620 60, Fax 03302 78620 69, info@me-systeme.de, www.me-systeme.de/en...

  • Page 4: 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 acquired by software.

  • Page 5: 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 6: 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 7: 15-Pole Sub-D Connector Of The Gsv-2Tsd (-Di)

    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 To connect half- and Negative bridge sensor supply quarterbridges, pin 14 Positive differential input and pin 15 must be connected together.

  • Page 8: 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 9: Connecting The Serial Interface

    All cable shields should be connected to the metal of the cable entrance or to GND. The supply voltage must be connected to the clips 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. We offer the GSV-2 with the following options: ±5 V, 0...10 V, or 4...20 mA current output.

  • Page 10: Commissioning Devices With Canopen Interface

    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. To ensure the sonformity with the CANopen protocol, the CANopen interface must be switched on in the factory state.

  • Page 11: Null-Balance Calibration

    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). b) Reduction of the input sensitivity to 1 mV/V with a bridge excitation voltage of 5.0 V, e.g.

  • Page 12: Using Switching Output

    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. The coil of a relay can be switched between output SW1 or SW2 and supply voltage U The relay is activated if the threshold is exceeded.

  • Page 13: Usage Of The Keyboard And The Menu

    Usage of the keyboard and the menu Menu entry level Menu entry level 2 Menu entry level 3 Sensor config. unit Select the unit ➔ Sensor capacity Setting the physical nominal value of the ➔ sensor. Rated output Setting the electrical rated output of the sensor.² ➔...

  • Page 14: Advice

    Menu entry level Menu entry level 2 Menu entry level 3 Scaling Number value between 0,15 and1580000 Data acquisition Data frequency Number value for measuring values per second ➔ [Hz] Number value for data period in seconds Data period ➔ Options Set channel Number value 0 or 1...

  • Page 15: Description Of The Keys

    Description of the keys Function MODE Switch on and off or enter the logger-menu MENU Enter into main menu or cancel an input. (LEFT) Move to upper menu level. If changing number: Move cursor left Browsing the menu entries or augment a number / digit value. DOWN Browsing the menu entry or reduce a number / digit value.

  • Page 16: Data Output

    Data output By default setting, the GSV operates with a communication bit rate of 38400 Baud 1 Start bit, 8 data bits, no Parity and 1 stop bit (8N1). There are two types of data frames for the communication of the measuring values: 1.

  • Page 17: Display Settings

    sign, 6 numbers, decimal point, free space, unit, CR, LF for example +1.2345 kgCRLF Attention: If the unit is switched off (with the command number 15, Set unit, code 7), the output frame ends with „space“ and CRLF: +1.2345 CRLF Display settings With the binary coded data protocol the measured values are transmitted standardized to + 1.

  • Page 18: 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 parameters bytes send by the (Hexadecimal) reset status read scale...
  • Page 19 Command Command Command name Number of Number of data parameters bytes send by the (Hexadecimal) get range reserved get offset wait get options reserved reserved reserved reserved get value clear maximum value set Digits get Digits reserved reserved Get Channel Get Last Error Set Second Threshold Get Second Threshold...
  • Page 20 Command Command Command name Number of Number of data parameters bytes send by the (Hexadecimal) reserved SetAdaptFilterMask³ GetAdaptFilterMask³ SetAdaptFilterOptimize³ GetAdaptFilterOptimize³ Read Ranges reserved Get Sensor Capacity Set Sensor Capacity Get Rated Output Set Rated Output 7 From firmware version 1.3.07 on 8 From firmware version 1.5.06 on ME-Meßsysteme GmbH, Neuendorfstr.

  • Page 21: 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 22 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 23 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. Remarks: Only the commands write offset and set offset affect the analog output. Affected register: Offset.
  • Page 24 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. Attention: The previous content of the ADCs calibration register is getting lost. The analog output is not affected.
  • Page 25 Affected register: Scale. Possible error codes: 0xA0,0x81,0x83,0x71 Set offset Command number: 14 Number of parameters: 0 Bytes sent by the GSV: 0 Set offset accomplishes an offset adjustment of the input stage of the GSV. In contrast to set zero, this adjustment does affect the analog output of the GSV. Remark: While adjusting the GSV is not sending any values.
  • Page 26 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” before. The decimal point has to be set separately with Set dpoint.
  • Page 27 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 28 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 29 Read Frequency Command number: 22 Number of parameters: 0 Bytes sent by the GSV: 3 The 3 parameter bytes returned from the command ReadFrequency are coding the measuring data rate. With the GSV-21 the data range is not continuously settable (look at Set Frequency). That's why the decoded data rate read with Read Frequency may vary a little bit from the value setted before (e.g.
  • Page 30 the switch thresholds (with window comparator turned off). The thresholds can be set with set threshold. Thresholds at the measuring range end deactivate the threshold switch, so that the switch command should have effect regardless of the thresholds. Value Range: 0x00..0x01 Possible error codes 0xA0,0x71 Get serial number Command number: 31...
  • Page 31 Stop transmission Command number: 35 Number of parameters: 0 Bytes sent by the GSV: 0 Stop transmission stops the serial transmission of the measuring values. The serial transmit buffer of the GSV will be emptied. This operation status will get lost after turning off the amplifier.

  • Page 32: Firmware Version

    Value Range: 0x00..0x1E Functionalities of activating the tare line (Input "T") Sending of Sending of zero Reset Maximum measuring value maximum value adjustment value Log-Mode= No (is permanently no (irrelevant) Max-Mode = sending measuring values) Log-Mode = no (is sending Max-Mode = permanently max- values)
  • Page 33 Set gage factor Command number: 44 Number of parameters: 2 Bytes sent by the GSV: 0 Set gage factor sets the gage factor. When using the GSV as a strain indicator, the display scaling factor can be recalculated by the command Calc Norm, using the gage- factor, the bridge type and the poissons ratio stored (the latter only if applicable).
  • Page 34 Half Bridge Quarter Bridge Half Bridge with transverse contraction Full Bridge with transverse contraction Value Range: 0x00..0x04 Possible error codes 0xA0,0x54,0x71 Get bridge type Command number: 49 Number of parameters: 0 Bytes sent by the GSV: 1 Get bridge type reads the bridge type with the coding described before. Possible error codes 0xA0,0x91 Set range Command number: 50...
  • Page 35 Get options Command number: 54 Number of parameters: 0 Bytes sent by the GSV: 3 Get options Determines information about the range of the instruction set and about special characteristics of the firmware as a 24 bit value. With the GSV-21 bit 6 and bit 8 are always set.
  • Page 36 Possible error codes 0xA0,0x54,0x71 Get Digits Command number: 62 Number of parameters: 0 Bytes sent by the GSV: 1 Get Digits determines the number of digits shown in the LC-Display. Possible error codes 0xA0,0x54 Get Channel Command number: 65 Number of parameters: 0 Bytes sent by the GSV: 1 Get Channel reads the the active analog input channel.
  • Page 37 wrong parameter, functionality not implemented in this FW: 0x59 Not enough parameters or parameter timeout: 0x5A Sending of parameters was impossible (unspecified): 0x90 (reserved) Sending of parameters was impossible because tx-buffer was full: 0x91 Sending of parameters was impossible because (CAN-)Bus busy: 0x92 Execution was impossible because the receive buffer is full: 0x99...
  • Page 38 alc norm triggers the calculation of the display scaling factor according to the strain indicator functionality. Hereby the K-factor, the bridgetype, the input sensitivity and - depending on the bridgetype - the poissons ratio will be concidered. At the same time channel 0 will be setted, as well as the amplification of the AD-converter setted to one and the unit shown to µm/m.
  • Page 39 procedure to change the bitrate is: turn off – set the jumper – turn on- open serial interface with 38400 bps – program desired new bitrate with SetBaud – turn off – remove JP2 – turn on. Then the new bitrate should be activated. The bitrates are coded as follows: Parameter / Register Baudrate...
  • Page 40 SetSpecialMode Command number: 136 Number of parameters: 2 Bytes sent by the GSV: 0 With the Special-Mode-Register some special features of the GSV-21 can be set. The content of high byte is shown in the following table: Bit 14 Bit 13 Bit 12 Bit 11 Bit 10...
  • Page 41 Possible error codes 0xA0,0x53,0x59,0x71 GetSpecialMode Command number: 137 Number of parameters: 0 Bytes sent by the GSV: 2 With GetSpecialMode you can read the register described before. Possible error codes 0xA0,0x91 WriteSamplingRate Command number: 138 Number of parameters: 3 Bytes sent by the GSV: 0 This command sets the sampling rate of the AD converter and the number of summands of the decimating average filter and as such also the resulting data rate.
  • Page 42 With ReadSamplingRate the sampling rate and the number of the averaging values can be read, as described in WriteSamplingRate: Byte 1: Number of the average values in Bits <5:0>, Bits 6 and 7 =1 Byte 2: Highbyte of the Sampling-Rate-Register Byte 2: Lowbyte of the Sampling-Rate-Register Whereby: sampling rate = Sampling-Rate-Register / 2 Possible error codes 0xA0,0x91...
  • Page 43 After changing, the new CAN-Bitrate will be valid only after a Bootup-cycle (switch on and off) or after a reset cycle by CANopen network management, if the CAN-Interface is on. If it's off, the new CAN-Bitrate will be valid when switching on the CAN interface, see CAN-Flags. Possible error codes: 0xA0, 0x71, 0x73, 0x75, 0x51, 0x52, 0x54, 0x58, 0x5A Index 0x7D: CAN-Node-ID: With this, the Node-ID of the GSV-2-CANopen (the “Node”) can be altered: Datenparameter = gewünschte Node-ID.
  • Page 44 Set analogue filter Command number: 144 Number of parameters: 2 Bytes sent by the GSV: 0 With Set analogue filter the cut-off frequency of the prefilter can be changed, if the AutoFilt-Flag of the Special-Mode-Registers is =0, see Set/Get special Mode. This low pass filter is before the AD-converter and it is able to improve the signal to noise ratio both of the digital and the analogue output.
  • Page 45 Enable blocking: Parameter = "e3F", that is Param.1=0x65, Param.2=0x33, Param.3=0x46 Disable Blocking: Parameter = "k7B", that is Param.1=0x6B, Param.2=0x37, Param.3=0x42 Attention: Every other parameter will be interpreted as a wrong blocking-password and after 3 trials with wrong parameters the command will always be denied (indipendent of the parameter), the error code in this case is 0x74.
  • Page 46 Example (bipolar): Shall NoiseCut-Threshold be = 0x810000; then all measuring values, that are between 0x810000 and 0x7F0000, set to 0x800000 exactly. Value range: bipolar: 0x800000..0xFFFFFF; unipolar: 0x000000..0x7FFFFF possible error codes: 0xA0, 0x71,0x75, 0x54, 0x55, 0x84, 0x41 Get NoiseCut Threshold (only if NoiseCut existent) Command number: 149 Number of parameters: 0 Bytes sent by the GSV: 3...
  • Page 47 With Set UserTextChar a user defined text can be displayed in the LCD. The first parameter is the adress, that means the position of the character in the display. A text of up to 16 characters can be displayed, so the value range of this adress is from 0 (left side of LCD) to 0x0F (right side of LCD);...
  • Page 48 SetAdaptFilterMask Command number: 158 Number of parameters: 3 Bytes sent by the GSV: 0 With SetAdaptFilterMask the comparison mask of the adaptive averaging filter can be set. 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.
  • Page 49 want to attenuate the stamping of the cattle on the balance (that's the noise signal) with the adaptive averaging filter. Then you would follow these steps: The adaptive averaging filter must be enabled. Now let some animals go onto the balance and give then SetAdaptFilterOptimize e.g.
  • Page 50 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 51 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 52 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 53: 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 54: Supported Services

    Supported services 5 different mandatory RX-NMT objects for the state-management (see CiA 301) • Heartbeat-producing with indication of the actual state and bootup-frame • 1 Tx-PDO for measuring values • 37 different SDOs in the Object dictionary, two of them manufacturer-defined, see •...

  • Page 55: Default Settings

    Event-Timer (1800.5) ready OR • Changing of measuring value >= Analog Input Delta Transmission Value (6133h), • if 6133.1 > 0 If the Transmission-Type is = 254, the Event-Timer is ignored. If the Inhibit-Time (1800.3) is >0 and not expired yet, no further PDO will be transmitted. Default settings: CAN-Bitrate 500kBits/s...
  • Page 56 scaling factor, in order to show physical measurement values (for example ±2mV/V). To calculate measuring values scaled in physical units please calculate as follows: 1. Without using the Windows-DLL, Mode „bipolar“: Measuring value = ((Raw binary – 8388608) / 8388607) * 1,05 * scaling factor 2.

  • Page 57: Technical Data

    Technical Data (At U = 12…26V DC in the nominal temperature range) Model GSV-2LS / GSV-2ASD / FSD /TSD Unit / GSV-2AS remarks Accuracy class analog digital Measuring ranges ±1 (JP1 set to pos.1, 5V Sensorspeisung) mV/V Analog output ±2 or ±3.5 (by software and JP1 to pos.2, 2.5V sensor...
  • Page 58 Nominal temperature range -40…+85 -20…+70 °C Storage temperature range Dimensions (L x W x H) 125 x 53 x 30 Print board (GSV-2LS) 180 x 65 x 36 180 x 65 x 40 Housing (GSV-2AS/ASD) Protection degree of IP66 IP40...

  • Page 59: Canbus Interface

    CANbus Interface The bus voltages are expected to be in the range from 0.5 to 4.5V (Common mode); Withstand voltage: 0..+26V referred to CAN-GND. CANOpen Vendor-ID 24 23 department company ME-Meßsysteme GmbH, Neuendorfstr. 18a, D-16761 Hennigsdorf Germany Phone 03302 78620 60, Fax 03302 78620 69, info@me-systeme.de, www.me-systeme.de/en...

  • Page 60: 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 61 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 62: 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...

  • Page 63: Dimensions Of The Aluminium Housing Of The Gsv-2As

    Dimensions of the aluminium housing of the GSV-2AS ME-Meßsysteme GmbH, Neuendorfstr. 18a, D-16761 Hennigsdorf Germany Phone 03302 78620 60, Fax 03302 78620 69, info@me-systeme.de, www.me-systeme.de/en...
  • Page 64 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 ME-Meßsysteme GmbH, Neuendorfstr. 18a, D-16761 Hennigsdorf Phone 03302 78620 60, Fax 03302 78620 69, info@me-systeme.de www.me-systeme.de/en...
  • Page 66 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 © 1999-2012 Made in Germany...

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