Measurement Computing USB-DIO24/37 - Manual (Page 16)

USB-DIO24/37 User's Guide Specifications
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Data transfer rates
Table 3. Data transfer rate specifications
Digital I/O transfer rates (software paced)
Digital input 62 port reads or single bit reads per second (typical)
Digital output 125port writes or single bit writes per second (typical)
Counter/timer read/write rates (software paced)
Counter read 62 port reads per second (typical)
Counter clear 125 port writes per second (typical)
Power
Table 4 . Power specifications
Parameter Conditions Specification
Supply current (Note 2) 20 mA typ, 40 mA max
+5V USB power available (Note3) Connected to Self-Powered Hub 4.5 V min, 5.25 V max
Connected to Bus-Powered Hub 4.1 V min, 5.25 V max
Output current (Note 4) Connected to Self-Powered Hub 460 mA max
Connected to Bus-Powered Hub 60 mA max
Note 2: This is the total current requirement for the USB-DIO24/37 which includes up to 5 mA for the status
LED.
Note 3: Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB hubs
and hosts without their own power supply.
Note 4: This refers to the total amount of current that can be sourced from the USB +5V and digital outputs.
General
Table 5. General specifications
Parameter Conditions Specification
USB controller clock error 25 °C ±30 ppm max
0 to 70 °C ±50 ppm max
Device type USB 1.1 low-speed
Device compatibility USB 1.1, USB 2.0
Environmental
Table 6. Environmental specifications
Operating temperature range 0 to 70 °C
Storage temperature range -40 to 85 °C
Humidity 0 to 90% non-condensing