Acnodes FES 2215 - Manual (Page 21)

19. Digital I/O Header (10-pin JGPIO1) [refer to P.13, No. 13]
20. Panel Brightness and Speaker Volume Control (7-pin BLT_VOL1) [refer to P.13, No. 21]
21. Panel BackLight Inverter Connector (6-pin BLT_PWR2) [refer to P.13, No. 22]
22. RJ-45 COM Port C (8-pin COM Port C ) [refer to P.13, No. 11]