Task Event - WriteString?

[John]

I'm running eprime pro and trying to use task events to trigger an external 
device.

When the stimulus comes on the screen, I need eprime to send the string 
"RUN" to the serial port.

In task events, I do the following:
-Add an event
-Select the serial device (COM3)
-Action:  WriteString

...but then how to I define what the string is?  (i.e. "RUN")


(In a terminal window, i can type "echo RUN > COM3" and that triggers the 
device...I'm just trying to figure out how eprime to do that.)

Thanks! 

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