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'

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