I-Pi OT2IT Signal Terminology

I Input
O Output
IO Bi-directional input/output
OD Open Drain
REF Reference voltage ouput
P Power
G Ground
AI Analog Input
AO Analog Output

Analog Signals

Connector: AOV-CH1-2
Ref: CN2313		 MCU PIN signal description
Pin Signal Type Pin
1 AOV0 AO PA02
2 GND P
3 AOV1 AO PA05
4 GND P
Connector: AIC- CH3-4
Ref: CN2314		 MCU PIN signal description
Pin Signal Type Pin
1 24V P
2 All_P2 AI PB04
3 24V P
4 All_P3 AI PB05
Connector: AIC- CH5-6
Ref: CN2315		 MCU PIN signal description
Pin Signal Type Pin
1 24V P
2 All_A0 AI PB08
3 GND P
4 24V P
5 All_A1 AI PB09
6 GND P
Connector: AOV- CH1-2
Ref: CN2313		 MCU PIN signal description
Pin Signal Type Pin
1 AOV0 AO PA02
2 GND P
3 AOV1 AO PA05
4 GND P
Connector: AIV
Ref: CN2311		 MCU PIN signal description
Pin Signal Type Pin
1 AIV0 AI PB07
2 GND P

Resitance Temperature Detector

Connector: AIV
Ref: CN2311		 MCU PIN signal description
Pin Signal Type Pin
1 RTD0_IN+ DI PB26 - S4P1_SPI_SCK
PB27 - S4P0_SPI_MOSI
PB28 - S4P2_SPI_SS
PB29 - S4P3_SPI_MISO
PC24 - S4_SPI_GPIO_DRDY
2 RTD0_IN- DI
3 RTD1_IN+ DI PC31 - S5_SPI_GPIO_DRDY
PB00 - S5P2_SPI_SS
PB01 - S5P3_SPI_MISO
PB02 - S5P0_SPI_MOSI
PB03 - S5P1_SPI_SCK
3 RTD1_IN- DI

Digital Signals

Connector: DI- CH1-3
Ref: CN2302		 MCU PIN signal description
Pin Signal Type Pin
1 24V P
2 DI4 DI MCU, PC14
3 24V P
4 DI5 DI IO Exoabder, I.O1 GPIO | I/01
5 24V P
6 DI6 DI6 IO Expander, I/O2 GPIO | I/02
7 GND P Ground signal
Connector: DI- CH4-5
Ref: CN2301		 MCU PIN signal description
Pin Signal Type Pin
1 24V P
2 DI0 DI PA06
3 24V P
4 DI1 DI PA07
5 GND P Ground signal
Connector: DI- CH6-7
Ref: CN2306		 MCU PIN signal description
Pin Signal Type Pin
1 24V P
2 DI2 DI PC07
3 24V P
4 DI3 DI PA10
5 GND P Ground signal
Connector: DO- CH1-2
Ref: CN2303		 MCU PIN signal description
Pin Signal Type Pin
1 24V/12V/5V P Input voltage, selectable via CN2901
2 DO0 DO PC10
3 GND P Ground signal
4 14V/12V/5V P Input voltage, selectable via CN2901
5 DO1 DO PD11
6 GND P Ground signal
Connector: DO- CH3-4
Ref: CN2308		 MCU PIN signal description
Pin Signal Type Pin
1 24V/12V/5V P Input voltage, selectable via CN2901
2 DO2 DO PB14
3 GND P Ground signal
4 14V/12V/5V P Input voltage, selectable via CN2901
5 DO3 DO PC18
6 GND P Ground signal
Connector: DO- CH5-6
Ref: CN2309		 IO Expander (SX1509B)
 signal description
Pin Signal Type Pin
1 24V/12V/5V P Input voltage, selectable via CN2901
2 DO6 DO I/O10
3 GND P Ground signal
4 14V/12V/5V P Input voltage, selectable via CN2901
5 DO7 DO I/O13
6 GND P Ground signal

Note: Voltage output selector works on all outputs combined, 5, 12, or 24V DC.

Relays

Connector: Relay Out
Ref: CN2305		 MCU PIN signal description
Pin Signal Type Pin
1 24V P PB07
2 DORO0 DO PC04
3 DORO1 DO PC05
4 DORO2 DO PC06
5 GND P PC04 Ground signal