Canon GP215 Service Handbook page 146

SERVICE MODE
a. Multi-Output Tray-1/2 Input/Output Ports (2/2)
Address Bit
ST-EX-C 0 Not used
1 PCB internal signal
2 PCB internal signal
3 Tray B paper detection (PI11)
4 Tray A paper detection (PI10)
5 Tray B discharge paper detection
(PI9)
6 Tray A delivery detection (PI8)
7 Tray feeding assembly inlet slot
sensor (PI7)
7–38
Indication Signal Jack
TBPD J12-4 1: Paper present.
TAPD J12-1 1: Paper present.
TBP J11-14 1: Paper detected.
TAP J11-8 1: Paper detected.
TFPD J11-5 1: Paper detected.
Logic