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9 

Chapter 3 

Functional Details 

Analog input acquisition modes 

The USB-1208HS can acquire analog input data in two basic modes – software paced and hardware paced. 

Software paced mode 

You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion by 
calling a software command. The analog value is converted to digital data and returned to the computer. You 
can repeat this procedure until you have the total number of samples that you want. 

The throughput sample rate in software paced mode is system-dependent, and can range from 33 S/s to 
4000 S/s. 

Hardware paced mode 

You can acquire data from up to eight channels in hardware-paced mode. The analog data is continuously 
acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1208HS until you stop 
the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB-1208HS FIFO buffer to 
the memory buffer on your computer. 

The maximum sample rate is 1 MS/s aggregate over one-to-eight channels. You can start a continuous scan with 
either a software command or with an external hardware trigger event. 

External components 

The USB-1208HS has the following external components, as shown in Figure 2. 

 

Screw terminals 

 

LED indicators 

 

USB connector 

 

1 

Screw terminal pins 1 to 28 

4 

Activity LED 

2 

Screw terminal pins 29 to 56 

5 

USB connector 

3 

Status LED 

 

 

Figure 2. External components 

 

Содержание USB-1208HS

Страница 1: ...USB 1208HS High Speed Analog Input and Digital I O Document Revision 4 July 2014 Copyright 2014 User s Guide ...

Страница 2: ...ep it These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising fro...

Страница 3: ... 8 Chapter 3 Functional Details 9 Analog input acquisition modes 9 Software paced mode 9 Hardware paced mode 9 External components 9 Screw terminals 10 USB connector 11 Activity LED 11 Status LED 11 Signal connections 11 Analog input 11 External clock I O 12 Digital I O 12 Counter input 14 Timer output 14 Trigger input 14 Power output 15 Ground 15 Chapter 4 Specifications 16 Analog input 16 Digita...

Страница 4: ...USB 1208HS User s Guide 4 Screw terminal connector and pinout 21 Declaration of Conformity 23 ...

Страница 5: ... is used for the names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find more information Additional information about USB 1208HS hardware is available on our website at www mccdaq com You can also contact Measurement Computing Corporation by phone fax or e...

Страница 6: ...hannels Two 32 bit counter inputs One 32 bit timer output Screw terminals for field wiring connections The device is powered by the 5 volt USB supply from your computer and requires no external power The USB 1208HS is a USB 2 0 high speed device supported under popular Microsoft Windows operating systems The USB 1208HS is compatible with both USB 1 1 and USB 2 0 ports although the speed of the mod...

Страница 7: ...r to the International Distributors section on our web site at www mccdaq com International Installing the software Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD This booklet is available in PDF at www mccdaq com PDFmanuals DAQ Software Quick Start pdf Installing the hardware Be sure you are using the latest system software Before you install the devi...

Страница 8: ...urns off The Status LED turns off if communication is lost between the device and the computer To restore communication disconnect the USB cable from the computer and reconnect it The Status LED should turn on Calibrating the USB 1208HS The USB 1208HS is shipped fully calibrated Calibration coefficients are stored in EEPROM Return the device to Measurement Computing Corporation when calibration is...

Страница 9: ...ou can acquire data from up to eight channels in hardware paced mode The analog data is continuously acquired converted to digital values and written to an onboard FIFO buffer on the USB 1208HS until you stop the scan The FIFO buffer is serviced in blocks as the data is transferred from the USB 1208HS FIFO buffer to the memory buffer on your computer The maximum sample rate is 1 MS s aggregate ove...

Страница 10: ...etails 10 Screw terminals The differential mode pinout is shown in Figure 3 Figure 3 Differential mode pinout The single ended mode pinout is shown in Figure 4 Figure 4 Single ended mode pinout Use 16 AWG to 30 AWG for signal connections ...

Страница 11: ...e signal to be measured connects to AINx The second wire connects to AGND Differential mode requires two wires plus a ground reference The wire carrying the positive portion of the differential signal to be measured connects to AINx The wire carrying the negative portion of the differential signal to be measured connects to AIN x 1 The analog ground reference wire connects to AGND The terminal con...

Страница 12: ...vides one external clock input AICKI and one external clock output AICKO for analog inputs You can connect an external clock signal to AICKI and or AOCKI When using an external clock AICKO outputs the pulse generated from AICKI When using the internal clock AICKO outputs the ADC scan clock Digital I O You can connect up to 16 digital I O lines to screw terminals DIO0 through DIO15 The 16 DIO termi...

Страница 13: ...mplete the following steps to set the W34 jumper 1 Turn over the USB 1208HS and rest it on its top on a flat stable surface 2 Peel off the four rubber feet on the bottom of the module to access the screws 3 Remove the four screws shown in Figure 8 from the bottom of the device Figure 8 Location of screws connecting bottom and top sections of case 4 Holding both the top and bottom sections of the m...

Страница 14: ...R terminal to connect to the pulse width modulation PWM timer output You can set the following timer output parameters through software pulse frequency duty cycle pulse width divided by the pulse period number of pulses to generate time delay before starting the timer output after it s enabled resting state of the output idle high or idle low The timer can generate a pulse output with a programmab...

Страница 15: ...ernal devices or circuitry These terminals can output up to 285 mA Refer to Figure 3 and Figure 4 on page 10 for the location of this pin Caution The 5V terminals are outputs Do not connect to an external power supply or you may damage the USB 1208HS and possibly the computer Ground The analog ground AGND connections provide a common ground for all analog I O channels The ground GND connections pr...

Страница 16: ...selectable range for each channel Absolute maximum input voltage CHx IN to GND 25 V max power on 12 V max power off Input impedance 35 MΩ min Input bandwidth 3 dB All input ranges 2 MHz typ Input leakage current 250 nA typ Input capacitance 32 pf typ Offset error drift 5 ppm C typ Gain error drift 25 ppm C typ Maximum working voltage signal common mode 20 V 14 V 10 V 11 V 5 V 5 5 V Sample rate 1 S...

Страница 17: ...me in µs typical Condition Range 1 LSB 4 LSB 8 LSB full scale to full scale channel switch same range to same range 10 V 1 5 1 1 1 0 5 V 2 1 1 1 1 0 2 5 V 2 2 1 1 1 0 0 V to 10 V 2 6 1 1 1 0 Digital input output Table 5 Digital I O specifications Parameter Specification Digital type CMOS Number of I O 16 Configuration Each bit may be configured as input power on default or output Pull up configura...

Страница 18: ...ations Parameter Specification Terminal names AICKI AICKO Terminal types AICKI Input active on rising edge AICKO Output power on default is 0 V active on rising edge Terminal descriptions AICKI Receives sampling clock from external source AICKO Outputs the internal sampling clock A D clock or pulse generated from AICKI when in external clock mode Input clock rate 1 MHz max Clock pulse width AICKI ...

Страница 19: ...ulse width 25 ns min Low pulse width 25 ns min Timer Table 9 Timer specifications Parameter Specification Timer terminal name TMR Timer type PWM output with count period delay and pulse width registers Output value Default state is idle low with pulses high software selectable output invert Internal clock frequency 40 MHz Register widths 32 bits High pulse width 20 ns min Low pulse width 20 ns min...

Страница 20: ...e range see Note 2 Run mode 4 25 V min 5 25 V max Suspend mode enumeration 0 V 5 V output current Run mode no other output loads 290 mA max 1 45 W Fuses On USB supply 0452 750 Littelfuse 0 750A NANO2 Slo Blo Subminiature Surface Mount Fuse Spare fuse mounted in holder on PCB Note 1 This is the total current consumption for USB 1208HS including 5 V and digital output currents Note 2 Output voltage ...

Страница 21: ...6 AWG to 30 AWG Table 16 Single ended mode pinout Pin Signal name Pin Signal name 1 AIN0 29 NC 2 AGND 30 NC 3 AIN1 31 AGND 4 AGND 32 NC 5 AIN2 33 NC 6 AGND 34 AGND 7 AIN3 35 AICKI 8 AGND 36 AICKO 9 AIN4 37 NC 10 AGND 38 NC 11 AIN5 39 TRIG 12 AGND 40 GND 13 AIN6 41 CTR0 14 AGND 42 CTR1 15 AIN7 43 TMR 16 AGND 44 GND 17 empty 45 empty 18 5V 46 5V 19 GND 47 GND 20 DIO0 48 DIO8 21 DIO1 49 DIO9 22 DIO2 ...

Страница 22: ...N1 33 NC 6 AGND 34 AGND 7 AIN1 35 AICKI 8 AGND 36 AICKO 9 AIN2 37 NC 10 AGND 38 NC 11 AIN2 39 TRIG 12 AGND 40 GND 13 AIN3 41 CTR0 14 AGND 42 CTR1 15 AIN3 43 TMR 16 AGND 44 GND 17 empty 45 empty 18 5V 46 5V 19 GND 47 GND 20 DIO0 48 DIO8 21 DIO1 49 DIO9 22 DIO2 50 DIO10 23 DIO3 51 DIO11 24 DIO4 52 DIO12 25 DIO5 53 DIO13 26 DIO6 54 DIO14 27 DIO7 55 DIO15 28 GND 56 GND ...

Страница 23: ...immunity To maintain compliance to the standards of this declaration the following conditions must be met The host computer peripheral equipment power sources and expansion hardware must be CE compliant All I O cables must be shielded with the shields connected to ground I O cables must be less than 3 meters 9 75 feet in length The host computer must be properly grounded The host computer must be ...

Страница 24: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com ...

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