What do I need to hook up my AC Jr. to a computer?

Well, first off, you need an ACJR that has a serial port. They sell them both with and without the port.
The next thing you need is a serial cable. Unfortunately, you will need to buy the one from Neptune system as it uses an old DIN connector type that is difficult to find these days.
Finally, you need a GISC (Ground Isolated Serial Connector) unless you don't care about accurate PH readings. Without the GISC, the PH reading will most likely be way off.
Once you have all of that, plug the GISC into the serial port on your computer, plug the serial cable into both the GISC and the ACJR and you're good to go.
You will also need either AquaNotes or Joel's (much better) Reef Trakker software.
-JB

 

Well thank you JB. Fawn you can download it from www.reeftrakker.com, its free for GIRS members.

 

Yes, go ahead and use the Try it now link. Install that and follow the directions. Let me know if you have any problems.