Change 7i76 mode question

Received a new pendant, (hardwired offshore brand, xyz456, x1,x10,x100 100mpg (A/A-/B/B-) estop and enabled buttons)

From my manual, I need to get my 7i76 into mode2 in order to get the extra MPG encoder (main is on the spindle so I need more)

in the main HAL I have
loadrt hm2_pci config=" num_encoders=1 num_pwmgens=0 num_stepgens=2 sserial_port_0=0000xx"

I'm reading in another thread (AndyPugh)
Note that these are single-ended encoders, so I think you just ignore the /A and /B pins.
To set the 7i76 to MPG mode change the "loadrt hm2_pci" line in the HAL file to include config="sserial_port_0=20xxxxxx"
(keep anything else that already exists in that config string)

So should it be like this to include the 20xxxxxx
loadrt hm2_pci config=" num_encoders=1 num_pwmgens=0 num_stepgens=2 sserial_port_0=0000xx sserial_port_0=20xxxxxx"

or replace the existing 0=0000xx with the 20xxxxxx (this is my guess but I'm frequently wrong)
loadrt hm2_pci config=" num_encoders=1 num_pwmgens=0 num_stepgens=2 sserial_port_0=20xxxxxx"

My current system is more or less working (except for gears still) so I don't want to screw it up (at least not too much)
M

Replace the existing 0000xx with 2000xx

Thanks so much
Is that going to screw anything else up? (I've got to double check my limit switches which I think are on TB6)
As in will it affect any of the existing VFD, Steppers (x and z) spindle encoder type thing?
M

No, the only thing this will do is provide some additional hal pins

Thanks

Change made, tomorrow I'll see if I can get in there and wire this up and then start asking more questions
M