One BSGc has 12 buttons.
If you need more than 12 buttons’ CAN output for the radio or original equipment though BSGc device, you can use another BSG index as slave BSGc.
The CAN messages of the slave BSGc are outputed through one Master BSGc device.

If this BSG module is the master BSG module, choose “Master”.
If this BSG module is the extension of the other BSG. choose the master BSG index of this BSG module at Master BSG Index.

For example,
If Mater BSG Index is 1, this BSG index works as a part of the BSG index 1.
The Slave BSG shares the Idle Message of Master BSG.