Measurement-computing USB-5201 Instrukcja Użytkownika Pobierz pdf (Strona 20)

USB-5201 User's Guide Specifications

Throughput rate to PC

The analog inputs are configured to run continuously. Each channel is sampled twice per second. The maximum

latency between when a sample is acquired and the temperature data is provided by the USB unit is

approximately 0.5 seconds.

Maximum throughput to a CompactFlash® memory card is 1 S/s per channel.

Table 4. Throughput rate to PC specifications

Number of

input channels

Maximum throughput

1 2 S/s

2 2 S/s on each channel, 4 S/s total

3 2 S/s on each channel, 6 S/s total

4 2 S/s on each channel, 8 S/s total

5 2 S/s on each channel, 10 S/s total

6 2 S/s on each channel, 12 S/s total

7 2 S/s on each channel, 14 S/s total

8 2 S/s on each channel, 16 S/s total

Digital I/O

All ground pins on the device (pins 9, 19, 28, 38) are isolated from earth ground. If a connection is made to

earth ground when using digital I/O and conductive thermocouples, the thermocouples are no longer isolated. In

this case, do not connect thermocouples to any conductive surfaces that may be referenced to earth ground.

Table 5. Digital input/output specifications

Parameter Specification

Digital type CMOS

Number of I/O 8 (DIO0 through DIO7)

Configuration Independently configured for input or output.

Power on reset is input mode unless bit is configured for alarm.

Pull up/pull-down

configuration

All pins pulled up to +5 V through 47 kΩ resistors (default). Pull-down to ground also

available.

Digital I/O transfer rate

(software paced)

 Digital input: 50 port reads or single bit reads per second typ

 Digital output: 100 port writes or single bit writes per second typ

Input high voltage 2.0 V min, 5.5 V absolute max

Input low voltage 0.8 V max, –0.5 V absolute min

Output low voltage

(IOL = 2.5 mA)

0.7 V max

Output high voltage

(IOH = –2.5 mA)

3.8 V min

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27

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