TeeJet Legacy 6000 Manual - Manual (Page 9)

Chapter 1 - introduction 4
switch Function module
the Switch Function module (SFm) enables manual and automated boom section
control (expandable to 20).
Figure 1-3: Switch Function Module (SFM)
CAn switchbox
the CaN Switchbox is used when existing switches are not present in the vehicle
and is nearly always used in conjunction with a Switch Function module (SFm).
each switchbox controls up to 10 sections (expandable to 20).
Figure 1-4: CAN Switchbox