Chapter 3 Functional Details; Analog Input Modes; Software Paced; Hardware Paced - Measurement Computing E-1608 User Manual

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Functional Details

Analog input modes

The E-1608 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.
1 Screw terminal pins 17 to 32
2 Screw terminal pins 1 to 16
3 Factory reset button

Ethernet connector

The E-1608 has one 10/100 BASE-T, auto-negotiation, high-speed communication port. The port connector is
an RJ-45, eight-position connector. The Ethernet port accepts CAT-5 shielded or unshielded twisted pair cable.
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4 Power LED (top) and Activity LED (bottom)
Ethernet connector with Link/activity LED (left) and
5
Speed LED (right)
6 External power connector
Figure 2. E-1608 external components
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Chapter 3