Measurement Computing USB-5201 - Manual (Page 15)

USB-5201 User's Guide Functional Details
15
LED function when the USB-5201 is connected to an active USB port
LED Illumination Indication
Steady green The USB-5201 is connected to a computer or external USB hub.
Blinks continuously Data is being transferred.
Upon connection, the LED should flash a few times and then remain lit (indicates a successful
installation).
Blinks three times Initial communication is established between the USB-5201 and the computer.
Off The USB-5201 is not connected to an active USB port.
Refer to the following table for the function of the USB-5201 LED when the device is connected to the external
supply and is logging data. The function of the LED varies according to the selected logging mode.
LED function when the USB-5201 is logging data
Logging mode LED Illumination Indication
Logging off The LED is off. The USB-5201 is not logging data, and/or
the device is not powered
Start Logging on
Power Up The LED turns on when external power is
connected, then blinks each time data is captured. Blinks when logging data.
Start Logging on
Button The LED stays off until the data logging button is
pressed and held for approximately 1 second. At that
time, the LED turns on and blinks each time data is
captured. Blinks when logging data.
Start Logging at
Specified Time The LED is off – blinks on once per second until the
specified date/time to start logging is reached. At
that time, the LED turns on – blinks off each time
data is captured. Blinks on once per second until specified
data/time to log data occurs. Then it turns
on and blinks each time data is captured.
Any logging mode Blinks rapidly (250 ms period) and continuously.  The memory card is full.
 The memory card was removed during
logging. Insert the memory card again
to stop the device blinking.
CompactFlash memory card slot
The CompactFlash slot accepts standard memory cards. A 512 MB memory card is shipped with the device. For
extensive data logging, you can insert a higher capacity card of up to 2 GB. You must format the memory card
before logging data for the first time.
Calculating the logging time for a memory card
Use the following formula to calculate the approximate amount of logging time in seconds that one of the
supported memory card allows. The USB-5201 supports 512 MB , 1 GB, and 2 GB CompactFlash memory
cards.
where
 time = total disk time in seconds
 N
Disk
= size of memory card in bytes
 N
DIO
= 1 byte for digital I/O
 n
Channels
= number of channels logged
 R = logging rate in seconds
 N
TS
= 6 bytes for timestamp, if enabled
 N
Temp
= 4 bytes for a temperature reading
 N
CJC
= 8 bytes if CJC sensor readings are enabled