Measurement Computing USB-5201 - Manual (Page 20)

USB-5201 User's Guide Specifications
20
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 k
Ω 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