LED Pin on 6001 not lighting up

[Sid05]

I have a USB 6001 that I connect to a USB port on my Windows laptop. Please see pin configuration below. Pin 18 on USB 6001 OEM points to the LED. But when I connect an actual LED to that pin relative to a ground [Pin 19] - the LED does not light up. What could be causing this?

The same LED does light up when I connect it to +5V [Pin 34] and Ground [Pin 32] - thus proving that the LED is fine and the DAQ is connected to the laptop. FYI - my intent is to have the LED mounted on a panel on my enclosure to serve as an indication of successful DAQ connection. Appreciate any help/guidance. Thank you. 

[Henrik_Volkers]

Don't know where your pinout is comming from, the USB 6001 spec tell me another pinout....

however: The mentioned LED output could be configured as an open collector output, so you should try to connect the LED (in series with a current limiting resistor , say 470 Ohm!)  between +5V and <LED>pin .  (with Anode to to +5V 😉 )

[AnalogKid2DigitalMan]

Henrik is spot on, see Fig 6 of the attached.

Henrik- this is the OEM version of the 6xxx series.

-AK2DM