External triggering on Cyton 32-bit board

I am trying to do a P300 test so that I can try to figure out the exact delay of the trigger for my group's design project, but I'm unclear about the directions listed on the external triggering page from OpenBCI: http://docs.openbci.com/Tutorials/06-External_Trigger_Cyton_Example 

I'm pretty sure we have a 3.x.x firmware since we ordered and received the board in December 2017, although I'll try to make sure by checking the version via terminal emulator (once I learn how to use that). What section of that page should we be following? EXTERNAL TRIGGERING THE HARDER WAY (FIRMWARE 1.X.X)? We have an optoisolator and will be using a computer that has a parallel port with pins that emit a voltage of 0.3 V from the P300 paradigm loaded on the computer. Do I need to be loading the sample code or do I just have to put in the pins into the digital inputs and the board will automatically switch to the correct input mode?

As I'm a novice with this, I'm also not sure what the following means: "allowing you to simply read from the analog input (sending /2) or digital input (sending /3) with the type of a command. The default board is activated by default, but can always be achieved again by sending a /0."  


From what program are we supposed to send /2, /3, or /0? 

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