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CP-IO19R - IO Relay Board Accessory for ComfilePi 40 pin header

The CP-IO19R is an IO relay board accessory for the ComfilePi consisting of 11 inputs, 8 relay outputs, screw terminals, and corresponding indicator LEDs. It can be mounted to the rear panel of the CPi-A/B/S series panel PCs.

This product cannot be mounted on CPi-C070WR4C.

Warnings and Precautions


C# Control Example

The following is an example project illustrating how to program the CP-IO19R in C# using the Mono Framework.

Download Source Code

This example PInvoke's the pigpio library. For more information see the PInvoke documentation and the pigpiod C interface documentation

.NET 6 drivers can be found at the .NET IoT Libraries API Reference.

Python Example

The pigpio library also has a Python interface.

The following is an example illustrating digital inputs and outputs:

import pigpio
pi = pigpio.pi()
pi.set_mode(4, pigpio.INPUT)
pi.set_mode(17, pigpio.OUTPUT)
while True:
        pi.write(17, 1)
        pi.write(17, 0)

Pin Map

The CP-IO19R's pins are connected to the ComfilePi's GPIO header as shown below.

Inputs: GPIO 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16
Outputs: GPIO 17, 18, 19, 20, 21, 22, 23, 24

Specifications and IO Circuitry

  • Input Voltage: 5VDC (powered by ComfilePi's 5V pin)
  • Current Rating: 400mA or more
  • Humidity: 35 ~ 85% RH
  • Temperature: -10 ~ 60 ℃
  • Size: 128mm X 78mm


  • Voltage Range: 12 ~ 24V
  • Absolute Min/Max Voltage Range: 3.3 ~ 28V
  • Response Time: 5ms
  • Input OFF Level: < 1.8VDC
  • Input ON Level: > 2.5VDC
  • Indicator LED OFF Level: < 4.5V
  • Indicator LED ON Level: > 5.0V


  • Relay Driving Voltage: 24V (single power source)
  • Relay Driving Current: 10mA
  • Maximum Switching Voltage: 277VAC, 30VDC
  • Maximum Switching Current: 5A(AC), 3A(DC)
  • Maximum Switching Frequency: 10Hz
  • For more information see the ALDP124 Datasheet.

Setting the Initial IO State

It may be necessary to modify the ComfilePi's initial GPIO output state to prevent the ComfilePi from turning the outputs ON when the ComfilePi boots.

Modify the ComfilePi's /boot/config.txt file with the following configuration to set the initial IO state. See GPIO control in config.txt for more information.


COMFILE Technology's Documentation Library

cp-io19r/index.txt · Last modified: 2023/06/14 13:29 by COMFILE Technology