Canon PIXMA MP180 Service Reference Manual page 8

Part 3: APPENDIX
2. Connector Location and Pin Layout
2-1. Main Board
CN201 (IrDA) (MP460 only)
No.
1 S-GN
2 IR RXD
3 IR TXD
4 to 8 +3.3V
CN405 (Remote debugger)
No.
1 TXD
2 RXD
3 GND
4 +3.3V
Signal name
Signal name
Ground
Receiving data signal
Sending data signal
Power supply
Sending data signal
Receiving data signal
Ground
Power supply
(8/8)
Function
Function