EFOY Fuel Manager FM2 User Manual page 46

Image shows FM2, tank connections according to the Fuel Manager model (four
connections for FM4 or eight connections for FM8)
1 Button (fuel cartridge replacement/reset)
2 Power connection to EFOY fuel cell
3 Connection for fuel cartridge sensor FS2 (RJ10 socket)
4 2x SFC bus connection
5 Fuel cartridge connection for EFOY fuel cell
6 Device type, serial number
7 FM status LED
8 Tank status LED
9 Tank connections
Page 46
Design and specifications