The PT2009-A1 provides 2 extension connectors.
One of the extension connectors is used to connect the 'Call station extension (RS485, 8)' PTO2006-A1, the other is not used on the PT2009-A1.
Extension connectors - 'X1' and 'X5'
Pin | Description | Remark |
---|---|---|
1 | GND | GND reference voltage |
2 | 24 V | - |
3 | NC | Do not use this pin |
4 | 3.3 V | 3.3 V is not required to connect the extension module |
5 | SDA | Serial I2C bus interface, data |
6 | SCL | Serial I2C bus interface, clock |