I have a G-2800 DXC connected to RC1216 via an ERC4 serial interface. I have made the rotator calibration in the ERC interface (a software is provided by ERC) , not in RC1216 which just send RS232 to ethernet and manage 2 relays... I do not know the G232S-b device, but it should be able to calibrate your rotator.
73 Nicolas F1RAF