OM-USB-5203 User's Guide
Functional Details
18
Screw terminals
Use the screw terminals for connecting temperature sensors and digital I/O lines. These terminals also provide
ground and power output connections. Refer to the "Sensor Connections" chapter for screw terminal
descriptions.
USB connector
When not logging data, connect the USB cable to a USB port on your computer or to an external USB hub that
is connected to your computer. When connected to an active USB bus, the USB connector pr5 V power
and communication. The voltage supplied through the USB connector is system-dependent, and may be less
than 5 V. No external power supply is required.
Due to processing limitations, you cannot log data when the device is attached to an active USB bus. For data
logging operations, connect the USB connector to the external power supply.
LED
The LED uses up to 5 mA of current. The function of the LED varies according to whether the OM-USB-5203
is connected to an active USB port, or when the device is logging data and connected to the external power
supply.
Refer to the following table for the function of the LED when the device is connected to an active USB port and
not logging data.
LED function when the OM-USB-5203 is connected to an active USB port
LED Illumination
Indication
Steady green
The OM-USB-5203 is connected to a computer or external USB hub.
Blinks continuously
Data is being transferred.
Upon connection, the LED blinks a few times and then remain on (indicates a successful
installation).
Blinks several times
Initial communication is established between the OM-USB-5203 and the computer.
Off
The OM-USB-5203 is not connected to an active USB port.
Refer to the following table for the function of the 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 OM-USB-5203 is logging data
Logging mode
LED Illumination
Indication
Logging off
The LED is off.
The OM-USB-5203 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.
