Toolchange with a Brother TC-229

I'm working with a Brother TC-229 that has a 14-tool changer. It's a rotating set of holders that engages and releases when the z-axis moves through the toolchange location. A toolchange occurs when the z-axis is retracted almost to the top limit switch, where a lever disengages the tool and the holder swings in to grab the tool from the spindle. When the z-axis is retracted, the toolchanger can rotate. By pulsing the toolchange motor using a HAL timer for a few milliseconds, a cam is rotated until a sensor picks up the alignment. The cam also helps to eliminate overshoot, so there is no need to home the tool changer.

I have written an o-code subroutine to pulse the toolchange motor that reads an optical encoder, which is also located on the toolchanger. When the encoder finds the tool number that I've requested, it stops, and the toolchange process completes. I've remapped the M6 command to refer to the o-code, but I can't find a good way to work with the pocket numbers, instead of the tool numbers (e.g. #<_selected_tool>). I know that the random toolchanger keeps track of pocket numbers, but since this toolchanger doesn't swap tools, it doesn't seem like that implementation would work. I need to track tools using the tool table, but I also need to be able to change pockets. For example, I might need to manually change Tool 5 in Pocket 8 to Tool 9 in Pocket 8. From my perspective, the number tracking problem is fairly trivial - but I don't know how to re-work the T- command to find the pocket number instead of just calling the toolchanger to the tool number.

This might be a simple fix, but I haven't had much luck finding documentation on similar toolchange processes. Thanks in advance!

You're quite right about changing tool numbers, but what I need is to be able to keep track of more tools than there are pockets. For example, if I have a set of 20 different tools, and I want to put 14 of them in the toolchanger, I will also want to be able to retain the tool information for the other 6. Since the tool number and the pocket number both need to be non-negative integers, I want to use the tool number as the identifier for the tool, and the pocket number to find the tool in the changer. That way I can swap pocket numbers when I add or remove tools, but I can keep the tool numbers the same. Thus, my g-code can always use the same T- commands, but the machine uses the pocket number to find the tool.