The CP-IO13-4C is an IO board accessory for the ComfilePi consisting of 7 bipolar digital inputs, 6 digital outputs, corresponding indicator LEDs, 2 RS-232C ports, all exposed through screw terminals. It can be mounted to the rear panel of the CPi-C070WR4C panel PCs.

The following is an example project illustrating how to program the CP-IO13-4C in C# or VB.Net using the Mono Framework.

Source Code

This example application uses the following .NET libraries to control the digital inputs, outputs, and serial ports.

• System.Device.Gpio
• System.IO.Ports

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(6, pigpio.INPUT)
pi.set_mode(19, pigpio.OUTPUT)
 
while True:
    if pi.read(6):
        pi.write(19, 1)
    else:
        pi.write(19, 0)
 
pi.stop()

The CP-IO13-4C pins are connected to the ComfilePi CPi-C's GPIO header as shown below.

Inputs: GPIO 6, 7, 10, 11, 16, 17, 18
Outputs: GPIO 19, 20, 21, 22, 23, 24

• Input Voltage: 5VDC (powered by ComfilePi's 5V pin)
• Current Rating: 100mA or more
• Humidity: 35 ~ 85% RH
• Temperature: -10 ~ 60 ℃
• Size: 128mm X 78mm

• Bipolar relative to COM x 7
• 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

• DC Output Sink (NPN) x 6
• Maximum Output Voltage: 30VDC
• Response Time: 10ms
• Current: 150mA

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.

gpio=6-7=ip
gpio=10-11=ip
gpio=16-18=ip
gpio=19-24=op,pd,dl

To intitialize /dev/serial2 and /dev/serial3 add the following to the /boot/config.txt file.

dtoverlay=uart3,txd3_pin=4,rxd5_pin=1
dtoverlay=uart4,txd4_pin=8,rxd9_pin=1

COMFILE Technology's Documentation Library