hi, the 229 and 225 are slightly different, but the 225 has a "reversable motor controller with brake" which is a glorified relay with resistors to allow the motor to stop quickly. track 5 on the encoder is the "deceleration" track, which you would monitor for a state change and then hit the brake. you only have about 1/4 turn (after the gearing) to stop before the carousel starts to move to the next tool. the relay itself, im not sure if its 110v or direct 24v control. it may be 110v, with a 24v relay on the relay board controlling the 110v (seems redundant, but theres a few things in the machines like that).
i have not touched that part yet, cause my tc225 works "as is" and im keeping it like that for a little while. my 229 im still trying to get the servos going, which lately ive had no time to work on the last week.