Interface BX8-HD15 User manual
8-Channel Measuring Amplifier BX8
Operating manual
15‐247Version7H
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Measuring Amplifier BX8............................................................................................................................5
Description.................................................................................................................................................5
Versions ......................................................................................................................................................5
Interfaces.....................................................................................................................................................6
Software......................................................................................................................................................6
Features.......................................................................................................................................................6
Signal flow..................................................................................................................................................7
Galvanic isolation .......................................................................................................................................7
Dimensions .................................................................................................................................................8
BX8-HD15 15-pin HD D-Sub ................................................................................................................8
BX8-HD44 44-pin D-Sub .......................................................................................................................8
BX8-AS 24-pin M16 ..............................................................................................................................9
Specifications.............................................................................................................................................9
Analog input ...........................................................................................................................................9
Digital input / digital output..................................................................................................................10
Analog output .......................................................................................................................................10
Supply ...................................................................................................................................................10
Environmental data ...............................................................................................................................10
Interfaces...............................................................................................................................................10
Resolution of strain gauge input ...........................................................................................................11
Noise Amplitude at Analog Output ......................................................................................................11
Digital filters.............................................................................................................................................11
Finite Impulse response Filter ...........................................................................................................11
Infinite Impulse Response Filter...........................................................................................................12
Buttons and indicators............................................................................................................................13
Pin Configuration ...................................................................................................................................14
Input 15-pin HD D-Sub ........................................................................................................................14
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Input 44-pin HD D-Sub ........................................................................................................................15
Input M16 Binder 423...........................................................................................................................26
Connection strain gauge quarter bridge ................................................................................................28
Connection strain gauge half bridge .....................................................................................................28
Connection strain gauge full bridge......................................................................................................29
Connection of PT1000 ..........................................................................................................................29
Connection of the active sensors...........................................................................................................29
Analog output SUB-D25 socket ...........................................................................................................30
Digital in- and outputs Sub-D25 plug connector ..................................................................................31
EtherCat M12 4-pin socket D-coded ....................................................................................................33
CANbus M12 5-pin socket / plug A-coded ..........................................................................................33
UART Port 9-pin D-Sub socket............................................................................................................33
Voltage supply M8, 4-pin .....................................................................................................................34
Screw terminal BX8-AS .......................................................................................................................35
Additional information...............................................................................................................................37
LED indicators........................................................................................................................................37
LED indicators STATUS and FUNCTION on Ethercat devices..........................................................37
LED-display for error condition (all device models)................................................................................38
FUNCTION LED .....................................................................................................................................38
STATUS LED (red)..................................................................................................................................39
Digital inputs and outputs......................................................................................................................39
Digital-I/O Numbers .............................................................................................................................39
Digital I/O Functions ............................................................................................................................40
Inverting digital inputs..........................................................................................................................42
Further Notes Digital I/O......................................................................................................................43
Master-Slave Frame Synchronization...................................................................................................43
Data acquisition and Bandwidth ...............................................................................................................43
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Data frames and Bandwidth..................................................................................................................46
Frequency output 60kHz ±30khz..........................................................................................................47
Changelog .............................................................................................................................................48
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MeasuringAmplifierBX8
Description
The 8-channel BX8 measuring amplifier features high data resolution at frequencies of 1 Hz
to 48000 Hz. The 8 channels acquire data simultaneously.
Versions
Type Sensor Input Signal-Output
BX8-HD15 8x 15-Pin HD D-Sub 1x USB, UART, Analog, Digital-I/O
BX8-HD15-EC 8x 15-Pin HD D-Sub 1x USB, EtherCat, Analog, Digital-I/O
BX8-HD15-CAN 8x 15-Pin HD D-Sub 1x USB, UART, CAN, Analog, Digital-I/O
8-channel measuring amplifier
8x input configurable
Full, half, quarter bridges, 120- 350- 1000 Ohm, PT1000, ±10V
Outputs 1x USB Port, 8x Analog output ±10V, 4...20mA configurable, 1x UART,
Alternatively EtherCat, CANbus/CANopen
16x Digital in- and output
5x - Galvanic isolation: analog-input, analog-output, digital-I/O, UART, USB
8x - 48kS/s Simultaneous sampling
6-wire technology, bridge supply 2.5V, 5.0V, 8.75V configurable
Automatic configuration of analog and digital filters by specifying the data frequency
Additional Digital Filters IIR 4th order and FIR 14th order individually configurable
Step response of the filter configuration available (with PC software)
Resolution < 20 nV/V
Versions to connect 1-axis and 3- and 6-axis sensors
Autonomous calculation of 3 forces and moments of six-axis sensors
Two operating hours’ counters
Sensors with TEDS supported (readable and writable)
Integration of a Raspberry PI in the housing cover of the GSV-8AS
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BX8-HD44 4x 44-Pin HD D-Sub 1x USB, UART, Analog, Digital-I/O
BX8-HD44-EC 4x 44-Pin HD D-Sub 1x USB, EtherCat, Analog, Digital-I/O
BX8-HD44-CAN 4x 44-Pin HD D-Sub 1x USB, UART, CAN, Analog, Digital-I/O
BX8-AS 1x 24-Pin M16, screw terminal 1x USB, UART, Analog, Digital-I/O
BX8-AS-EC 1x 24-Pin M16, screw terminal 1x USB, EtherCat, Analog, Digital-I/O
BX8-AS-CAN 1x 24-Pin M16, screw terminal 1x USB, UART, CAN, Analog, Digital-I/O
BX8-AS-PI-3 1x 24-Pin M16, screw terminal like BX8-AS, but with Raspberry PI
Interfaces
Communication interfaces such as USB port or EtherCAT or CANbus are available. The
device has 8 configurable analog outputs (±10 V and 4...20 mA among others). UART
interface serves to control the measuring amplifier via the Raspberry PI (not for versions with
EtherCat).
The interface protocol of USB and UART is identical and described in a separate
documentation (ba-gsvcom.pdf). Standardized fieldbus protocols EtherCAT and CANopen
reside in the lower protocol layers and a separate document describes the application layer
(ba-gsv8canopen.pdf and ba-gsv8ethercat_en.pdf).
Software
The Windows program BlueDAQ with graphical user interface and the console terminal
program BX8 terminal are suitable. A Windows function library (MEGSBX8w32.dll) with
commented C header is available for self-programming users and a LabVIEW library with
wrapper VIs for this DLL for programming with LabVIEW ©.
Features
There are 8 analog inputs available. They are individually configurable as:
Strain gauge input for full bridges in 4 and 6 wire technology or
Strain gauge input for half bridges or
Strain gauge input for quarter bridges 120 ohm, 350 ohm, 1k Ohm or
Single-ended input ±10 V or
Input for PT1000 temperature sensor
The strain gauge supply voltage is adjustable between 8.75 V, 5.00 V and 2.5 V, assigned to
input sensitivities 2 mV/V, 3.5 mV/V or 7 mV/V.
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Bridge supply voltage Resulting input sensitivity
8.75 V 2 mV/V
5 V 3.5 mV/V
2.5 V 7 mV/V
Signalflow
Galvanicisolation
The supply voltage UB+ / 0V is galvanically isolated from the modules for
analog input
analog output
digital in- outputs
interfaces
The isolation voltage is 50 V
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UB+ Supply voltage 12...28V DC
UB- Ground Supply voltage
GNDE Ground analog-input
-Us Negative bridge supply
GNDA Ground analog-output
GNDD Ground digital input / output
GNDU Ground UART port („Raspberry PI Port“)
GNDR Ground RS232 port (only for Model 9330)
Dimensions
BX8‐HD1515‐pinHDD‐Sub
BX8‐HD4444‐pinD‐Sub
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BX8‐AS24‐pinM16
Specifications
Analoginput
Accuracy class 0.05%
Number of analog inputs 8
Strain gauge bridge input Quarter, half, full bridge
Input impedance > 20 Mohm (300pF)
Common mode rejection ratio DC > 120 dB
Common mode rejection ratio AC 100Hz > 100 dB
Strain gauge bridge completions 120 Ohm, 350 Ohm, 1k Ohm
Strain gauge bridge supply 2.50 V, 5.00 V, 8.75 Volt
Total current across all channels 200 mA
Max. current per channel at bridge supply 2.5V 40 mA (min. bridge resistance 62.5 Ohm)
Max. current per channel at bridge supply 5V 60 mA (min. bridge resistance 83.3 Ohm)
Max. current per channel at bridge supply 8.75V 26 mA (min. bridge resistance 336.5 Ohm)
Input sensitivities 7 mV/V, 3.5 mV/V, 2 mV/V
Input voltage, single-ended ±10 V
Input resistance 10M Ohm
Input for PT1000 sensor -230 °C ... +1500 °C
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Accuracy class 0.05%
Excitation voltage PT1000 1.25 V
Digitalinput/digitaloutput
Number of in-/ outputs 16
Output TTL (0V-5V), push-pull
total current across all channels 140 mA
max load current per output 25 mA
Input
max input voltage 5.5 V
min input voltage -0.5 V
Resistance Pullup +5V 10k Ohm
Sampling period 40m sec
Analogoutput
Number of analog outputs 8
Configuration of analog outputs 0...10V, -10V...+10V, 0...5V, -5V...+5V, 4...20mA
Supply
Supply voltage 12 V to 28 V
Power < 12 W
Environmentaldata
Operating temperature 0 °C ... +50 °C
Power < 12 W
Interfaces
USB 2.0 Full speed
Devices class Communication Device Class, HID (firmware update
only)
UART Level 3.3V, galvanically isolated;
auxiliary voltage 24VDC, 2A
EtherCat Protocol: CoE device profile 404, Mailbox- and
buffered mode, Synchronization: Hardware-Latching
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CANbus CANopen, device profile 404, 4x TxPDOs,
galvanically isolated
Resolutionofstraingaugeinput
The resolution of measuring amplifier depends on the adjusted input sensitivity and the data
frequency. The input sensitivity correlates to the bridge supply voltage: 8.75V with 2.0 mV/V,
5V with 3.5 mV/V, and 2.5V with 7 mV/V.
The recommended excitation voltage of 8.75V is only for sensors of minimum 1k Ohm bridge
resistance and sufficient construction size. Miniature sensors under 500g weight should not use a
bridge supply of 8.75V.
+Us 10 Hz 50 Hz 100 Hz 1 kHz 5 kHz 8 kHz
3.5 mV/V 5 V 2.0 1051.2 1058.0 1042.5 1041.0 1048.0 103
2.0 mV/V 8.75 V 3.0 1052.5 1051.5 1056.0 1044.0 1041.4 104
At a data frequency of 10 Hz the measuring range from 0 to +3.5 is quantised in 2.0 105
steps.
The noise amplitude is 17.5 nV/V.
At a sensor with rated force of 10 N and rated output of 0.5 mV/V the noise amplitude is
10 ⋅
0.5
3.5 ⋅
1
2.0107.14⋅10
NoiseAmplitudeatAnalogOutput
The noise amplitude at the analog output is approx. 25mV (peak values) or 10mV
(RMS). It is due to the galvanic isolation of the analog output. The frequency
components of the noise signal are predominantly at frequencies above 300 kHz and
higher. The use of oversampling with subsequent digital filtering (e.g. arithmetic
averaging) in the subsequent analog-digital conversion can greatly attenuate noise
signals.
Digitalfilters
The BX8 adjusts automatically the analog filter and the decimating digital input filter. The
user provides only the required number of measured values per second (data frequency),
which is send via USB-interface or made available to the field bus. Additionally there are two
adjustable digital filters: 1x FIR filter and 1x IIR filter. Each filter is individually adjustable
for any of the 8 input channels. The measured data signal processing chain performs FIR
filtering first, and then IIR filtering.
FiniteImpulseresponseFilter
The FIR filter is a low pass filter with which the filter order N and the cut-off frequency CF
can be set. The cut-off frequency refers to a signal frequency already attenuated by -3dB.
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This corresponds to a factor of approx. 0.7; frequency attenuation occurs for all higher
frequencies.
The filter order determines the maximum and minimum adjustable cut-off frequency CF in
terms of the data rate Fa, and the steepness of the attenuation range. Higher orders have a
steeper slope, i.e. an increase in the signal frequency causes the attenuation to increase faster.
The so-called step response is slower at higher orders however, i.e. it always takes N+1-
measured values until the filter’s output value corresponds to the input value.
Order CF/Fa min in Hz CF/Fa min in Hz
14 0.05 0.190
12 0.06 0.225
10 0.07 0.270
8 0.09 0.340
6 0.12 0.350
4 0.18 0.410
InfiniteImpulseResponseFilter
The infinite Impulse Response Filter (IIR) of fourth order allows four different filter types:
1) Low pass filter: Sensor signals at low frequency (including DC size with f=0) pass
through the filter, signals at a higher frequency are attenuated.
2) High pass filter: Sensor signals at low frequency (including DC size with f=0) are
attenuated, signals at a higher frequency pass through the filter. Note: Only
frequencies below half the measured data rate are processed. The measuring amplifier
includes an analog-to-digital sampling system, which in itself acts as a low pass.
3) Band pass filter: Signals permitted to pass through within a frequency range,
attenuation occurs for signal above or below this range.
4) Band stop filter (‘Notch filter’): Attenuation of signals occurs within a frequency
range, signals that are above or below attenuation range may pass through.
The cut-off frequency is configurable for low and high pass filters. The cut-off frequency
refers to a signal frequency already attenuated by -3dB. This corresponds to a factor of
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approx. 0.7; frequency attenuation occurs for all frequencies above for low pass and lying
below for high pass.
Configure both Bandpass and Band stop filters with two cut-off frequencies, the upper and
the lower. Attenuation by -3 dB also occurs here. The two cut-off frequencies may not be the
same. Signal frequencies lying between cut-off frequencies may pass through for the band
pass filter, and attenuate for the band stop filter.
The maximum (and the minimum if need be) of each cut-off frequency is dependent on the
measured data rate. Cut-off frequencies can be set to (0.49 * measured data rate), i.e. almost
to half.
Each individual channel is configurable with a filter and optionally switched on and off. The
configuration also remains the same for filters switched off.
Buttonsandindicators
Power-button with LED function Switch on and off the device (only BX8-HD)
Function LED
Mod-button with Led status a) reset the status LED;
b) start the Firmware-updates, if during the Power
On activates
CHK button with Check LED Sensor Test; by pressing the CHK button the sensor
signal for the unloaded condition is emulated on the
input of the measuring amplifier; for sensors with
calibration matrix the documented zero signals of the
sensor are emulated on the inputs.
TA „Tara“, Set-Zero“: trigger an automatic zero
adjustment for all outputs (analog and digital)
ECR-LED EtherCat EC Run;
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PinConfiguration
Input15‐pinHDD‐Sub
Connection of strain gauges, active sensors, TEDS. Activate bridge completion by shorting
“HB” (12) to -UD (10).
No Symbol Description
1 TEDS Transducer Electronic Data according to IEEE 1451.4
2 -Us Negative bridge supply
3 +Us Positive bridge supply
4 Q350 Quarter bridge completion 350 Ohm
5 +UD Positive differential input
6 GNDE Ground, analog input
7 -Uf Negative sense line (6-wire connection only)
8 +Uf Positive sense line (6-wire connection only)
9 Q120 Quarter bridge completion 120 Ohm
10 -UD Negative differential input
11 Q1k Quarter bridge completion 1000 Ohm
12 HB Half bridge completion
13 VCCIO Supply voltage for active sensors (optional)
14 Ue Analog input voltage, single ended ±10V
15 GNDIO Ground, supply voltage (optional)
Shield PE Earth (housing)
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Input44‐pinHDD‐Sub
Connect up to 3 channels to the 44-pin Sub D socket. The labeling on the front panel is 1/3
for connecting the channels 1 to 3.
1/3 Channels 1,2,3, D-Sub HD 44
Pin Signal Description Channel
Shield PE Earth (housing) -
1 TEDS Transducer Electronic Data according IEEE 1451.4 1
2 US- Negative bridge supply 1
3 US+ Positive bridge supply 1
4 Q350 Quarter bridge completion 350Ohm 1
5 UD+ Positive differential input 1
6 GNDE Ground, analog input 1
7 UF-
Negative sense line (6-wire connection only)
1
8 UF+ Positive sense line (6-wire connection only) 1
9 Q120 Quarter bridge completion 120Ohm 1
10 UD- Negative differential input 1
11 Q1k Quarter bridge completion 1000Ohm 1
12 HB Half bridge completion 1
13 UE
Analog input voltage, single ended ±10V
1
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1/3 Channels 1,2,3, D-Sub HD 44
Pin Signal Description Channel
14 GNDIO Not equipped sep.galv.isol (optional) 1
15 PE Earth (housing) -
16 TEDS Transducer Electronic Data according IEEE 1451.4 2
17 US- Negative bridge supply 2
18 US+ Positive bridge supply 2
19 Q350 Quarter bridge completion 350Ohm 2
20 UD+ Positive differential input 2
21 GNDE Ground, analog input 2
22 UF- Negative sense line (6-wire connection only) 2
23 UF+ Positive sense line (6-wire connection only) 2
24 Q120 Quarter bridge completion 120Ohm 2
25 UD- Negative differential input 2
26 Q1k Quarter bridge completion 1000Ohm 2
27 HB Halt bridge completion 2
28 UE Analog input voltage, single ended ±10V 2
29 GNDIO Not equipped sep.galv.isol (optional) 2
30 VCCIO Not equipped sep.galv.isol (optional) 1,2,3
31 TEDS Transducer Electronic Data acc. to IEEE 1451.4 3
32 US- Negative bridge supply 3
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1/3 Channels 1,2,3, D-Sub HD 44
Pin Signal Description Channel
33 US+ Positive bridge supply 3
34 Q350 Quarter bridge completion 350Ohm 3
35 UD+ Positive differential input 3
36 GNDE Ground, analog input 3
37 UF- Negative sense line (6-wire connection only) 3
38 UF+ Positive sense line (6-wire connection only) 3
39 Q120 Quarter bridge completion 120Ohm 3
40 UD- Negative differential input 3
41 Q1k Quarter bridge completion 1000Ohm 3
42 HB Half bridge completion 3
43 UE Analog input voltage, single ended ±10V 3
44 GNDIO Not equipped sep.galv.isol (optional) 3
The labelling on the front panel is 4/6 for connecting the channels 4 to 6.
4/6 Channels 4,5,6, D-Sub HD 44
Pin Signal Description Channel
Shield PE Earth (housing) -
1 TEDS Transducer Electronic Data acc. to IEEE 1451.4 4
2 US- Negative bridge supply 4
3 US+ Positive bridge supply 4
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4/6 Channels 4,5,6, D-Sub HD 44
Pin Signal Description Channel
4 Q350 Quarter bridge completion 350Ohm 4
5 UD+ Positive differential input 4
6 GNDE Ground, analog input 4
7 UF- Negative sense line (6-wire connection only) 4
8 UF+ Positive sense line (6-wire connection only) 4
9 Q120 Quarter bridge completion 120Ohm 4
10 UD- negative bridge supply 4
11 Q1k Quarter bridge completion 1000Ohm 4
12 HB Half bridge completion 4
13 UE Analog input voltage, single ended ±10V 4
14 GNDIO Not equipped sep.galv.isol (optional) 4
15 PE Earth (housing) -
16 TEDS Transducer Electronic Data acc. to IEEE 1451.4 5
17 US- Negative bridge supply 5
18 US+ Positive bridge supply 5
19 Q350 Quarter bridge completion 350 Ohm 5
20 UD+ Positive differential input 5
21 GNDE Ground, analog input 5
22 UF- Negative sense line (6-wire connection only) 5
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4/6 Channels 4,5,6, D-Sub HD 44
Pin Signal Description Channel
23 UF+ Positive sense line (6-wire connection only) 5
24 Q120 Quarter bridge completion 120Ohm 5
25 UD- Negative differential input 5
26 Q1k Quarter bridge completion 1000Ohm 5
27 HB Half bridge completion 5
28 UE Analog input voltage, single ended ±10V 5
29 GNDIO Not equipped sep.galv.isol (optional) 5
30 VCCIO Not equipped sep.galv.isol (optional) 4,5,6
31 TEDS Transducer Electronic Data acc. to IEEE 1451.4 6
32 US- Negative bridge supply 6
33 US+ Positive bridge supply 6
34 Q350 Quarter bridge completion 350Ohm 6
35 UD+ Positive differential input 6
36 GNDE Ground, analog input 6
37 UF- Negative sense line (6-wire connection only) 6
38 UF+ Positive sense line (6-wire connection only) 6
39 Q120 Quarter bridge completion 120Ohm 6
40 UD- Negative differential input 6
41 Q1k Quarter bridge completion 1000Ohm 6
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4/6 Channels 4,5,6, D-Sub HD 44
Pin Signal Description Channel
42 HB Half bridge completion 6
43 UE Analog input voltage, single ended ±10V 6
44 GNDIO Not equipped sep.galv.isol (optional) 6
Socket "1/6 connects up to 6 channels to the 44-pin D-Sub socket. The labeling on the front
panel is 1/6 for connecting the channels 1 to 6. The connections are parallel to the input jacks
1/3 and 4/6.
Channels 1,2,3,4,5,6, D-Sub HD 44
Pin Signal Description Channel
Shield PE Earth (housing) -
1 UF+ Positive sense line (6-wire connection only) 1
2 US+ Positive bridge supply 1
3 UD+ Positive differential input 1
4 UD- Negative differential input 1
5 US- Negative bridge supply 1
6 UF- Negative sense line (6-wire connection only) 1
7 TEDS Transducer Electronic Data according IEEE 1451.4 1
8 UF+ Positive sense line (6-wire connection only) 2
9 US+ Positive bridge supply 2
10 UD+ Positive differential input 2
11 UD- Negative differential input 2
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