iSMA-B-RJ12-RJ45

iSMA-B-RJ12-RJ45 is used to link the touch point back to the FCU controller.

iSMA new TP room displays, swapping the LP (pinouts)
The LP display range from iSMA uses an RJ12 connector, but the TP new range allows for an RJ45 or separate 4-wire connector.

Here is a quick reference for the pinouts
You have a fan coil controller and maybe an LP display, both using an RJ12 6-wire connector.
You get your new TP display and you have an RJ45 connector, or you can split the wires and connect the G, G0, + and -

bmsparts.co.uk

Here is a reference for you of the pinouts of the RJ12 connector and the new RJ45 connector, without having to check the docs.

bmsparts.co.uk