Measurement-computing E-1608-OEM Manuel d'utilisateur télécharger pdf (Page 12)

Chapter 3

Functional Details

Analog input modes

The E-1608-OEM can acquire analog input data in two basic modes – software paced and hardware paced.

Software paced

You can acquire one analog sample at a time in software-paced mode. You initiate the A/D conversion with a

software command. The analog value is converted to digital data and returned to the computer. Repeat this

procedure until you have the total number of samples that you want.

The sample rate in software paced mode is system-dependent and can range from 1000 S/s to 5000 S/s on local

networks (lower over the Internet or wireless networks).

Hardware paced

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 into the FIFO buffer on the device until you stop the scan. The

FIFO buffer is serviced in blocks as the data is transferred from the FIFO buffer to the computer memory

buffer. You start a continuous scan with either a software command or with an external hardware trigger event.

The maximum sample rate in hardware paced-mode from one to eight channels is 250 kS/s aggregate on local

hardwired networks (may be lower over the Internet or local wireless networks).

Device components

Device components are shown in Figure 2. Note that each screw terminal location is unpopulated.

Screw terminal J9

Ethernet connector

Header connector w4

Link/activity LED

Screw terminal J8

External power connector (power adapter sold separately)

Screw terminal J7

Power header connector W1

Factory reset button

Screw terminal J1

Power LED

Header connector W2

Activity LED

Screw terminal J2

Speed LED

Screw terminal J3

Figure 2. E-1608-OEM components

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Measurement-computing E-1608-OEM Manuel d'utilisateur Page 12