User Manual - Smacq | Data Acquisition (DAQ) series DAQ...1.Product Overview 1.1. General introduction A typical data acquisition system usually consists of sensors, signal conditioning

USB-2000 Series Multi-functional

Data Acquisition Device

User Manual

Rev: C

Smacq technologies Co., Ltd.

www.smacq.com www.smacq.cn

2

Content

1. PRODUCT OVERVIEW ......................................................................................................... 4

1.1. GENERAL INTRODUCTION ........................................................................................................... 4

1.2. BLOCK DIAGRAM ........................................................................................................................ 5

1.3. PRODUCT FEATURES ................................................................................................................... 5

1.4. PRODUCT SPECIFICATIONS ......................................................................................................... 5

Analog input .................................................................................................................. 6

Analog output ................................................................................................................ 7

Digital IO ........................................................................................................................ 7

Counter ........................................................................................................................... 7

Bus interface .................................................................................................................. 8

Power requirements ..................................................................................................... 8

Other specifications ...................................................................................................... 8

2. APPEARANCE AND CONNECTION .................................................................................. 10

2.1. PRODUCT APPEARANCE ............................................................................................................. 10

2.2. SIGNAL CONNECTION ............................................................................................................... 10

Front panel connection .............................................................................................. 10

Back panel connection ............................................................................................... 12

3. INSTALLATION AND TESTING ........................................................................................ 13

3.1. DRIVER INSTALLATION.............................................................................................................. 13

3.2. HARDWARE INSTALLATION ........................................................................................................ 14

4. ANALOG INPUT ................................................................................................................... 15

4.1. OVERVIEW ............................................................................................................................... 15

4.2. NOTES ON INPUT RANGE .......................................................................................................... 15

4.3. TRIGGERING SOURCE ............................................................................................................... 16

4.4. ANALOG INPUT MODE ............................................................................................................... 16

5. ANALOG OUTPUT ................................................................................................................ 16

5.1. OVERVIEW ............................................................................................................................... 16

5.2. TRIGGERING SOURCE ............................................................................................................... 17

6. DIGITAL IO .......................................................................................................................... 17

6.1. OVERVIEW ............................................................................................................................... 17

7. COUNTERS ........................................................................................................................... 18

7.1. OVERVIEW ............................................................................................................................... 18

7.2. EVENT COUNTER ...................................................................................................................... 18

7.3. CYCLE/POSITIVE PULSE WIDTH/NEGATIVE PULSE WIDTH MEASUREMENT .................................... 19

8. DEVELOPER PROGRAMMING GUIDE ............................................................................ 19

8.1. OVERVIEW ............................................................................................................................... 19

3

8.2. BASIC FUNCTIONS .................................................................................................................... 20

FindUSBDAQ() ............................................................................................................. 20

OpenDevice() ............................................................................................................... 20

CloseDevice() ............................................................................................................... 20

8.3. FUNCTIONS RELATED TO ANALOG INPUT .................................................................................... 20

SetUSB2AiRange() ...................................................................................................... 20

SetSampleRate() ......................................................................................................... 21

SetChanSel() ................................................................................................................ 22

SetTrigSource() ........................................................................................................... 22

SetTrigEdge() ............................................................................................................... 23

SetSoftTrig() ................................................................................................................ 23

ClearTrigger() .............................................................................................................. 24

8.4. FUNCTIONS RELATED TO ANALOG OUTPUT ................................................................................. 24

InitDA() ........................................................................................................................ 24

SetDA() ......................................................................................................................... 24

SetWavePt() ................................................................................................................. 25

ClrWavePt() .................................................................................................................. 25

SetWaveSampleRate()................................................................................................ 26

WaveOutput() .............................................................................................................. 26

8.5. FUNCTIONS RELATED TO DIGITAL IO ........................................................................................ 27

SetDioOut() .................................................................................................................. 27

8.6. FUNCTIONS RELATED TO COUNTERS .......................................................................................... 27

SetCounter() ................................................................................................................ 27

ClearCounter() ............................................................................................................. 28

8.7. FUNCTIONS RELATED TO DATA READ CONTROL ........................................................................... 29

StartRead() .................................................................................................................. 29

StopRead() ................................................................................................................... 29

GetAiChans() ............................................................................................................... 29

GetDioIn() .................................................................................................................... 30

GetCounter() ................................................................................................................ 30

GetCtrTime() ................................................................................................................ 31

ClearBufs() ................................................................................................................... 31

TransDioIn() ................................................................................................................. 31

8.8. ERROR CODES .......................................................................................................................... 32

8.9. LABVIEW DEVELOPER NOTES ................................................................................................... 32

8.10. MATLAB DEVELOPER NOTES .................................................................................................... 33

9. ORDERING INFORMATION.............................................................................................. 33

10. SERVICE AND WARRANTY ............................................................................................... 35

11. REVISION NOTES ............................................................................................................... 36

4

1. Product Overview

1.1. General introduction

A typical data acquisition system usually consists of sensors, signal conditioning devices, data

acquisition devices, computers and data processing software. Figure 2.1 shows a basic data

acquisition system formed by the Smacq USB Series device.

Data acquisition devices utilizing USB interface have a great advantage in its portability,

compared with those using interfaces like PCI and PXI, making them flexible enough to be used

anywhere when coupled with a laptop.

Smacq USB-2000 series is an a data acquisition device, in which all analog input channels share

one AD convert unit. When acquiring signals, the device uses a multiplexer to shift signals in

between channels. The very low background noise and high precision makes it optimal for most

data acquisition application.

Figure 2.1 Basic data acquisition system utilizing

Smacq USB series DAQ device

Sensor, signal

regulating test cords

USB data

acquisition device

Data processing

computer

5

1.2. Block diagram

1.3. Product features

Up to 16 channels analog input

Analog input range ±10V/±5V/±2.5V/±1.25V/±0.5V, software configurable

4 channels synchronous input output, up to 100KS/s sampling rate, output 0~10V

16 channels isolated digital input and 16 channels isolated digital output

4 channel 32-bit counter

LabVIEW, Visual Studio and MATLAB development support

1.4. Product specifications

The following specification parameters, if not specified otherwise, were tested after running

the device for 30 minutes under the temperature of 25 degree and humidity of 40%.

Figure 2.2 Smacq USB-2000 series DAQ device block diagram

Signal C

on

necto

r

Analog Input

Analog Output

Isolated

Digital Input

Isolated

Digital Output

Counter

Logical

Control

&

Memory

USB

Interface

6

Analog input

Model

USB-2

600

USB-2

601

USB-2

602

USB-2

650

USB-2

651

USB-2

652

USB-2

620

USB-2

621

USB-2

622

USB-2

610

USB-2

611

USB-2

612

Channels1 8SE/

4DIFF

16SE/

8DIFF

8SE/

4DIFF

16SE/

8DIFF

8SE/

4DIFF

16SE/

8DIFF

8SE/

4DIFF

16SE/

8DIFF

Synchronous sampling No

ADC resolution 16-bit

Converter type Successive approximation

Sampling rate 1MSa/s 500kSa/s 250kSa/s 125kSa/s

Timing resolution 20ns

FIFO cache 16k sampling points

Range ±10V/±5V/±2.5V/±1.25V/±0.5V

Safe voltage ± 15V，an input above safe voltage can damage the DAQ device

Input resistance 500MΩ

Input coupling mode DC

Triggering mode Software triggering、Digital input edge triggering

System noise

±10V：190uVrms

±5V：100uVrms

±2.5V：58uVrms

±1.25V：37uVrms

±0.5V：24uVrms

DC offset

±10V：900uV

±5V：900uV

±2.5V：600uV

±1.25V：300uV

±0.5V：100uV

1、SE means single-ended input；DIFF means differential input.

7

Analog output

Model USB-2601 USB-2651 USB-2621 USB-2611

Channels 4

Synchronous sampling Yes

DAC resolution 16-bit

Max updating rate 100kSa/s

Timing resolution 20ns

Triggering mode Software triggering

Output range 0~10V

Slew rate >1.8V/us

Output coupling mode DC

Output resistance 50Ω

Power on initial value 0V

Max arbitrary wave number 2000pts/ch

DC offset <26mV

Digital IO

Channels 8-DI（Digital input），8-DO（Digital output）

Optoelectronic isolation Yes

Input voltage range High level：1.2V to 24V / Low level：0V

Output voltage High level：2.9V to 3.5V

Output rise time 10us

Output fall time 18us

Digital output initial value 0V

Counter

Channels 4

8

Counter number of bits 32-bit

Counter measurement Edge count

Counting direction Upwards count

Max input frequency 50MHz

Min high pulse width 20ns

Min low pulse width 20ns

Input high level voltage 3.3V~5V

Input low level voltage 0V

Bus interface

USB interface standard USB 2.0 High Speed（480Mb/s）

USB interface connector USB series Type B connector

Power requirements

USB bus power

supply

4.75~5.25VDC（Can also use 5V power adapter as secondary power

supply）

Current

consumption

About 350mA

Other specifications

Size（mm） 210*150*38

Weight（g） About 680g

Analog input signal connector 3-PIN bolt terminal connector

Analog output signal connector 3-PIN bolt terminal connector

Counter input signal connector 3-PIN bolt terminal connector

Digital IO connector 10-PIN bolt terminal connector

Operating environment 0°C ~55°C

9

5%RH~90%RH，No condensation

Storage environment -40°C ~85°C

5%RH~90%RH，No condensation

10

2. Appearance and Connection

2.1. Product appearance

USB-2000 series DAQ devices utilized metal shield case. Figure 2.1 shows its front and

back panels. The front panel includes analog input channels, analog output channels, and

counter channels. The back panel includes digital IO connector, USB interface and power

socket.

2.2. Signal connection

Front panel connection

USB-2xx0 and USB-2xx2 model

Figure 2.1 USB-2000 Series DAQ device front and back panel

Analog input channel

Analog output channel

Power connector

5VDC

USB interface

Optoelectronic isolation digital

IO connector

11

Analog input channels are referred to as AI n, where n represents the channel number, e.g.

AI 0 is channel 0 while AI 1 is channel 1 and so on.

Figure 2.2 shows the analog input wiring, where AI n is analog signal input while GND is

ground signal input.

Diagram 2.1、Screw terminal pin signal detail.

Name Notes

GND Analog ground

AI 0 ~ AI 15

Analog input channel, AI 0 ~ AI 15 (for 8 channel models, only AI 0~AI 7 are

available)

For differential input, AI 0 is the signal + of channel 0 while AI 1 is the signal

– of channel 0. AI 2 is the signal + of channel 1 while AI 3 is the signal – of

channel 1.

USB-2xx1 model

AI n represents analog input channel where n represents the channel number. AI 0 is channel 0

while AI 1 is channel 1 and so on.

CT n represents counter input channel where n represents the channel number. CT 0 is channel 0

while CT 1 is channel 1 and so on.

AO n represents analog output channel where n represents the channel number. AO 0 is channel

0 while AO 1 is channel 1 and so on.

Figure 2.3 shows front panel wiring

Figure 2.2 Analog input wiring

12

Diagram 2.2、Screw terminal pin signal detail

Name Notes

GND Analog ground

AI 0 ~ AI 7

Analog input channel，AI 0 ~ AI 7

When using differential input，

AI 0 is signal + for channel 0，AI 1 is signal – for channel 0

AI 2is signal + for channel 1, AI 3 is signal – for channel 1

and so on

AO 0 ~ AO 3 Analog output channel，AO 0 ~ AO 3

CT 0 ~ CT 3 Counter input channel，CT 0 ~ CT 3

Back panel connection

DI n represents digital input channel where n represents the channel number. DI 0 is channel 0

while DI 1 is channel 1 and so on.

DO n represents digital output channel where n represents the channel number. DO 0 is channel

0 while DO 1 is channel 1 and so on.

Figure 2.4 shows the digital IO channel wiring. Due to optoelectronic isolation, the GND

here, the GND in analog channel and the GND for the DAQ device itself are all isolated.

Figure 2.3 Analog output wiring

13

Diagram 2.3、Screw terminal pin signal detail

Name Notes

DI 0~DI 7 Digital input channel，DI 0~DI 7

DO 0~DO 7 Digital output channel，DO 0~DO 7

GND Isolated digital ground

3. Installation and Testing

3.1. Driver installation

When connecting USB-2000 series DAQ device to computers running Windows OS via

USB interface, it requires installing the driver to recognize the device.

Below are the driver installation steps on a PC running Microsoft Windows 7 (There is

a need to turn off the driver signature certification before the driver installation on

Microsoft Windows 8, 8.1 and 10. There is no such need for the installation on Microsoft

Windows XP).

1) Launch Device Manager in Microsoft Windows.

2) You should see a device with an exclamation if everything is correctly connected.

Right click on it, and choose "Update Driver Software...".

3) Select "Browse my computer for driver software".

4) Select "Let me pick from a list of device drivers on my computer".

5) Select "Have Disk..."

Figure 2.4 Digital IO wiring

14

6) Click on "Browse" and click into the fold named "USB4000_USB2000 Series

DAQ\Driver" on the bundled driver disc. Click into the folder "Win7". If you are using 32-bit

OS, go into the folder "x86"; if you are using 64-bit OS, go into the folder "x64". Select

"gusb.inf", then click "Open" (the same file can also be used on Microsoft Windows 8, 8.1

and 10).

7) Click on "OK" within the window of "Install From Disk".

8) Click on "Next". If a security alert pops up, select "Install this driver software

anyway".

9) The OS will now begin the driver installation, which usually take about 30 seconds.

After the installation, the exclamation within the Device Manager will disappear, as shown

in Figure 3.1

3.2. Hardware Installation

For details on testing signals connection, refer to chapters on Analog Input, Digital IO

and Counter.

Figure 3.1, the Device Manager with Smacq device driver correctly installed.

15

After correctly installing the driver and connecting to correct signals, you can launch

any of the sample programs for USB-2000 Series DAQ devices on the resource disc.

These sample programs will display the acquired signals.

4. Analog Input

4.1. Overview

USB-2000 Series DAQ devices has two kinds of analog input channels, 8-channel and

16-channel. Its max sampling rate ranges from 1MS/s to 125kS/s. The resolution is 16-bit

and the input voltage range is ± 10V/± 5V/± 2.5V/± 1.25V/± 0.5V.

Figure 4.1 shows the block diagram for USB-2000 Series DAQ devices’ analog channel.

The main components in above diagram are：

ADC：Analog-to-digital converter, converting analog signals into digital signals

FIFO：Data cache FIFO

4.2. Notes on input range

Analog input range is programmable by software as±10V、±5V、±2.5V、±1.25V or

Figure 4.1 USB-2000 analog channel block diagram

16

±0.5V.

4.3. Triggering source

When USB-2000 devices acquire signals via analog input, the trigger source can be set

as a software trigger or a rising edge or falling edge of the digital IO input channel DIN

port.

4.4. Analog input mode

The USB-2000 series support ground reference single-ended input mode or

differential mode.

5. Analog Output

5.1. Overview

In USB-2000 series, USB-2xx1 includes 4 analog output channels. It can output the

voltage of 0~10V. Its resolution is 16-bit and its max sampling rate is 100kS/s.

The 4 analog output channels in USB-2xx1 are made up by 4 DA converters, and its

output resistance is 50Ω. Figure 5.1 shows its block diagram.

17

5.2. Triggering Source

When used as a waveform generator, USB-2xx1 supports starting output by software

triggers.

6. Digital IO

6.1. Overview

USB-2000 series DAQ devices are all equipped with 16 digital IO channels with

optoelectronic isolation, 8 DI channels and 8 DO channels.

Figure 6.1 shows the block diagram of USB series digital IO channel. DI and DO represents

the wiring ports for digital input and digital output.

AO 0 DAC DATA 0

AO 2 DAC DATA 2

AO 1 DAC DATA 1

AO 3 DAC DATA 3

Figure 5.1 USB Series analog output block diagram

18

7. Counters

7.1. Overview

In USB-2000 series, USB-2xx1 includes 4 counter channels. Its max input signal

voltage is 5V. GND is the ground reference signal for counter channels. The counter can be

software programmable to serve four functions

Event counter

Cycle measurement

Positive pulse width measurement

Negative pulse width measurement

7.2. Event counter

When the counter channel of the DAQ device is used as the event counters, it can be

DI

Din

Vcc

Figure 6.1 Digital IO channel block diagram

Dout DO

Vcc Viso

19

All functions here are C/C++ function model. If you use other languages

to develop applications, pay attention to the differences between data types.

used to record the number of rising edges of the CT port, or it can be set by software to

record the number of falling edges.

The event counter can only count up. That means, based on the number of received

pulses, the event counter value will be an incremental count like 1,2,3,4,5.

7.3. Cycle/Positive pulse width/Negative pulse

width measurement

The counter channel on DAQ device can be configured by software as cycle/positive

pulse width/negative pulse width measurement mode.

When set as cycle measurement mode, the DAQ device measures the time between

the two rising edges of the comparator output and stores the result in the corresponding

counter channel result, with a time accuracy of 20ns.

When set as positive pulse measurement mode, the DAQ device measures the time

between the one rising edge and the next falling edge of the comparator output and stores

the data in the corresponding counter channel result, with a time accuracy of 20ns.

When set as negative pulse measurement mode, the DAQ device measures the time

between the one falling edge and the next rising edge of the comparator output and stores

the data in the corresponding counter channel result, with a time accuracy of 20ns.

8. Developer Programming Guide

8.1. Overview

Developers can use the standard dynamic link library "gusb.dll" to interact with the

USB-2000 series DAQ devices to control all its features.

This chapter will detail all the functions provided by the gusb.dll library. The calling

format for all functions can also be found in the gusb.h file. For detailed control and call

procedures, refer to the example code.

20

8.2. Basic functions

FindUSBDAQ()

int _stdcall FindUSBDAQ()

Find the number of USB-2000 DAQ devices connected to the computer.

Return value：The number of USB-2000 DAQ devices connected to the computer.

OpenDevice()

int _stdcall OpenDevice(int DevIndex)

Open the specified device.

Parameter：

DevIndex，the index number of DAQ device，counting from 0

Return value：

0 represents no error. Refer to Chapter 8.8 for other error codes.

CloseDevice()

void _stdcall CloseDevice(int DevIndex)

Shut down specified device

Parameter：

DevIndex，the index number of DAQ device，counting from 0

8.3. Functions related to analog input

SetUSB2AiRange()

int _stdcall SetUSB4AiRange(int DevIndex, float Range)

21

Set the range for the DAQ device’s analog input channel

Parameter：

DevIndex，the index number of DAQ device, counting from 0

Range, the DAQ device's analog input channel range. The following are the

corresponding ranges for the set parameters：

Range parameter Actual max range

24

（Only for differential signal pair） Differential：±24.576V

20

（Only for differential signal pair） Differential：±20.48V

10 Differential：±10.24V

Single-ended：±10.24V




Single-ended：2.56V



0.5 Differential：±0.64V


Return value：


SetSampleRate()

int _stdcall SetSampleRate(int DevIndex, unsigned int SampleRate)

Set the sampling rate of analog input channel. For USB-2000 series, the analog input

acquisition channel is scan-type acquisition. The sampling rate is set to represent the sum

of all the selected channel sampling rates. For example, if two channels are selected, a

setting of 1000 means a sampling rate of 500S/s per channel.

22

The minimum time resolution of the sampling period is 20ns, so the best sampling

period accuracy can be achieved when the sampling period is set to an integer multiple of

20ns.

Parameter：

DevIndex，the index number of DAQ device, counting from 0.

SampleRate，sampling rate，measured by S/s. For example, to set the sampling

rate as 1kS/s, set the SampleRate as 1000.

Return value：


SetChanSel()

int _stdcall SetChanSel(int DevIndex, unsigned short ChSel)

Set the channel to select.

Parameter：

DevIndex, the index number of DAQ device, counting from 0.

ChSel，the channel to select. This binary bit for this parameter corresponds to the

analog input channel ai0~ai15 from low to high. 1 means selecting the channel, while

0 means not selecting the channel. For example, to select ai0 and ai1, set ChSel as

0x0003; to select ai0 and ai2, set ChSel as 0x0005.

If the analog input is configured as a differential input, only the even bits can be

selected when selecting a channel. For example, to select differential channel ch0 and

ch1, set ChSel as 0x0005; to select differential channel ch0, ch1 and ch3, set ChSel as

0x0015, and so on.

Return value：


SetTrigSource()

int _stdcall SetTrigSource(int DevIndex, unsigned char TrigSource)

Set trigger source for analog sampling

23

Parameter：


TrigSource, the triggering source to select. 0 represents software triggering. 1~8

represents digital input channel 0~7 as triggering source. When digital input channels are

triggering sources, SetTrigEdge() function can be used to set rising edge trigger or falling

edge trigger。

Return valu：


SetTrigEdge()

int _stdcall SetTrigEdge(int DevIndex, unsigned char TrigEdge)

Select rising edge trigger or falling edge trigger when set as digital triggering,

Parameter：


TrigEdge，1 represents rising edge trigger, while 0 represents falling edge trigger.

Return value：


SetSoftTrig()

int _stdcall SetSoftTrig(int DevIndex, unsigned char Trig)

Set software trigger.

Parameter：


Trig，software trigger switch, 0 represents turn off trigger, while 1 represents turn

on trigger.

Return value：


24

ClearTrigger()

int _stdcall ClearTrigger(int DevIndex)

Clear trigger flag.

Parameter：


Return value：


8.4. Functions related to analog output

InitDA()

int _stdcall InitDA(int DevIndex)

Initialize analog output. This function is required when using analog output. The

function needs only to be called once when powering on the computer every time.

Parameter：


Return value：


SetDA()

int _stdcall SetDA(int DevIndex, unsigned char DANum, float DAVolt)

When in need of outputting DC voltage from analog output channel, use this function

to configure.

Parameter：


DANum， the channel number to configure. It can be set as 0, 1, 2, 3,

corresponding to 4 analog output channels respectively. If there is the need to configure 4

channels at the same time, set this parameter as 255.

25

DAVolt，the voltage to set. It can be any value in the range of 0~10.

Return value：


SetWavePt()

int _stdcall SetWavePt(int DevIndex, unsigned char DANum, float DAVolt)

When outputting analog arbitrary wave, this function can be used to set the waveform

sampling point. Each time this function is run, the waveform point index number will be

incremented by one, until the ClrWavePt () function is executed, when the waveform point

index number will be cleared.

Parameter：


DANum，the channel number to configure. It can be set as 0, 1, 2, 3, corresponding to

4 analog output channels respectively. If there is the need to configure 4 channels at

the same time, set this parameter as 255.

DAVolt，Set the voltage for arbitrary wave sampling point. It can be any value in

the range of 0~10.

Return value：


ClrWavePt()

int _stdcall ClrWavePt(int DevIndex, unsigned char DANum)

Clear arbitrary wave data table.

Parameter：


DANum，the channel number to configure. It can be set as 0, 1, 2, 3, corresponding to

4 analog output channels respectively. If there is the need to configure 4 channels at

the same time, set this parameter as 255.

26

Return value：


SetWaveSampleRate()

int _stdcall SetWaveSampleRate(int DevIndex, unsigned int WaveSampleRate)

Set the sampling rate when outputting analog arbitrary wave. The 4 channels can only

be set to uniform sampling rate.

Parameter：


WaveSampleRate，the sampling rate for outputting analog arbitrary wave, up to

10000。

Return value：


WaveOutput()

int _stdcall WaveOutput(int DevIndex, unsigned char DANum)

The switch for outputting analog arbitrary wave.

Parameter：


DANum，the lower 4 bits (binary) of this parameter correspond to the four

channels of the analog output. Set 1 to enable the arbitrary wave output of the

channel. Set 0 to stop the arbitrary wave output of the channel.

For example，

to output channel 0 only, set the parameter as 1；




to output channel 0 and 1 simultaneously, set the parameter as 3;

To output channel 0 and 2 simultaneously, set the parameter as 5;

27

and so on.

Return value：


8.5. Functions related to Digital IO

SetDioOut()

int _stdcall SetDioOut(int DevIndex, unsigned int DioOut)

Set the value of digital IO output channel DO

Parameter：


DioOut，DOUT value for digital IO output channel. The lower 8 digits of DioOut

corresponds to 8 channels of digital IO output channel DO.

Return value：


8.6. Functions related to counters

SetCounter()

int _stdcall SetCounter(int DevIndex, unsigned char CtrNum, unsigned char

CtrMode, unsigned char CtrEdge)

Set counter functions.

Parameter：


CtrNum，the index number of counter channel. 0~3 corresponds to Ct0~Ct3.

Setting it to 0x0f will allow 4 channel counters to work simultaneously.

CtrMode，the counter work mode. 0 represents event counter mode. 1 represents

28

measurement period. 2 represents measuring positive pulse width. 3 represents

measuring negative pulse width.

CtrEdge，when working in event counter mode, setting it as 1 represents counting

rising edges, while 2 represents counting falling edges.

Return value：


StartCounter()

int _stdcall StartCounter(int DevIndex, unsigned char CtrNum, unsigned char

OnOff)

Counter switch. Turn on or turn off the counter.

Parameter：


CtrNum，counter channel index number. 0~3 corresponds to Ct0~Ct3. Setting it

to 0x0f will allow 4 channel counters to work simultaneously.

OnOff，1 represents turning on the counter, while 0 represents turning off the

counter.

Return value：


ClearCounter()

int _stdcall ClearCounter(int DevIndex, unsigned char CtrNum)

Clear the counter.

Parameter：


CtrNum，counter channel index number. 0~3 corresponds to Ct0~Ct3. Setting it

to 0x0f will allow 4 channel counters to work simultaneously.

Return value：


29

8.7. Functions related to data read control

StartRead()

int _stdcall StartRead(int DevIndex)

Start reading data. This function will start a thread to automatically read data from the

DAQ device’s FIFO and save it into the software FIFO on the computer.

Parameter：


Return value：


StopRead()

int _stdcall StopRead(int DevIndex)

Stop reading data. This function will terminate the read thread started by StartRead()

function.

Parameter：


Return value：


GetAiChans()

int _stdcall GetAiChans(int DevIndex, unsigned long Num, unsigned short

ChSel, float *Ai, long TimeOut)

Get the analog input channel sampling data stored in software FIFO. For continuous

sampling, repeat calling this function to get the continuous sampling wave.

Parameter：

30


Num，The obtained number of analog sampling points, which represents the

points to get for each channel.

ChSel，The channel to select. This parameter's binary digits, from low to high,

correspond to analog input channels ai0~ai15. 1 represents selecting this channel,

while 0 representing not using this channel. For example, if you need to select ai0and

ai1, ChSel should be set as 0x0003; if you need to select ai0and ai2, ChSel should be

set as 0x0005;

*Ai，

TimOut，set the timeout。If software FIFO hasn't acquired enough Num during the

set time, the function will terminate and return a timeout error code.

Return value：

When the return value is not negative, it represents the left space of software FIFO,

which should be an integer within 0~2000000. When the return value is negative, that

represents something wrong. Please refer to chapter 8.8 for more error codes.

GetDioIn()

unsigned int _stdcall GetDioIn(int DevIndex)

Get the value of digital IO channel DIN

Parameter：


Return value：

The value of digital IO channel DIN, with low 6 digits correspond to the value of DI

0~DI 7.

GetCounter()

unsigned int _stdcall GetCounter(int DevIndex, unsigned char CtrNum)

Get the value of event counter.

Parameter：

31


CtrNum，the index number of counter. 0~3 corresponds to CT 0~CT 3。

Return value：

The value of event counter.

GetCtrTime()

double _stdcall GetCtrTime(int DevIndex, unsigned char CtrNum)

Get the value of cycle/positive pulse width/negative pulse width, measured in us.

Parameter：


CtrNum，the index number of counter. 0~3 corresponds to CT 0~CT 3。

Return value：

The value of cycle/positive pulse width/negative pulse width, measured in us.

ClearBufs()

int _stdcall ClearBufs(int DevIndex)

Clear analog input cache, including software FIFO and hardware FIFO.

Parameter：


Return value：


TransDioIn()

int _stdcall TransDioIn(int DevIndex, unsigned char TransDioSwitch)

Start separate transfer of digital port data, including DIN data and counter data.

When you only need to transfer digital input DIN channel data or counter data, you

need to call this function first. If you have started analog acquisition, there will be no

32

need to call this function to get the correct DIN data and counter data. Please refer to

example codes for digital IO and counter for detailed usage.

Parameter：


TransDioSwitch，switch of data transfer. 1 represents start, while 0 represents

stop.

Return value：


8.8. Error codes

If there is negative return value when calling functions, that indicates errors in the

operation. The detailed error codes are listed in Diagram 4.

Diagram 4, error codes

Error code Notes

-1 No USB series DAQ device is found connected to the computer.

-2 Index overflow on the DAQ device.

-3 Firmware error on the DAQ device.

-4 The DAQ device is shut down.

-5 Data transfer error.

-6 The computer does not have enough memory.

-7 Timeout

-8 Read thread is not started.

8.9. LabVIEW developer notes

LabVIEW developers can also control the DAQ device by calling the dynamic link

library. At the same time, we provide a series of vi files and example codes that correspond

to all of the functions aforementioned. These files can be found on the resource CD.

33

8.10. MATLAB developer notes

MATLAB developers can also control the DAQ device by calling the dynamic link library. At

the same time, we provide an m file to detail all of the functions aforementioned. The file

can be found on the resource CD.

9. Ordering Information

Device

Model Notes

USB-2602 16 channels analog input, 16-bit resolution, with max sampling rate of

1MSa/s

USB-2601

8 channels analog input, 16-bit resolution, with max sampling rate of

1MSa/s

4 channels synchronous analog output, 16-bit resolution, with max

sampling rate of 100kSa/s/ch


1MSa/s


500kSa/s

USB-2651


500kSa/s




500kSa/s


250kSa/s


34

250kSa/s




250kSa/s


125kSa/s

USB-2611


125kSa/s




125kSa/s

Bundled accessory

Mode Notes

USB-A-B USB connector，1.5 meter，USB-A type to USB-B type

TB3-3.81 Bolt terminal connector，3 digit，with spacing of 3.81mm

TB10-3.81 Bolt terminal connector，10 digit，with spacing of 3.81mm

Optional accessory

Model Notes

CHF-100B Current sensor，100A，DC~20kHz，output ±4V

CHV-600VD Voltage sensor，600V，DC~20kHz，isolated differential input，output

±5V

35

10. Service and Warranty

All Smacq products can be serviced free of charge under normal use within their

warranty. Refer to the warranty notes inside their package for details.

Unless otherwise provided in this manual or warranty statement, Smacq does not

provide any other warranties, either express or implied.

If you need technical support or more service details, or if you have any questions

using this product or reading this document, feel free to contact us.

Tel：010-52482802

Email：[email protected]

Website：www.smacq.com / www.smacq.cn

36

11. Revision notes

Date Version Notes

2014.12.12 Rev: A Initial release

2015.03.20 Rev: B Correct typo and revise wording.

2016.11.15 Rev: C Re-layout and complement the function description for

outputting analog arbitrary waveform.

Documents

User Manual - Smacq | Data Acquisition (DAQ) series DAQ...1.Product Overview 1.1. General introduction A typical data acquisition system usually consists of sensors, signal conditioning