02.06 MIC 733

2.6MIC-733

This page provides the official documentation and software packages for testing the Digital I/O (DI/DO) and COM port functionality on the MIC-733. These resources contain the necessary guides to understand the hardware, obtain the correct test software, and perform the procedures successfully.

MIC-733 COM port     

This section provides the procedures for testing the onboard COM ports on the MIC-733 for both RS232 and RS485 communication. The testing involves configuring the port mode, connecting the ports for a loopback test, and using a Python script to verify communication.

⚠️ Important

When switching between RS485 and RS232 testing, a system reboot is required between tests to ensure the ports are configured correctly.

RS485 Test Procedure

1. Hardware Connection

For the RS485 loopback test, connect two DB9 connectors as follows:

From COM1	To COM2
Pin 1	Pin 1
Pin 2	Pin 2
Pin 5	Pin 5

2. Configure COM Port Mode

Open a terminal and execute the following commands to set both COM1 and COM2 to RS485 mode.

sudo chmod 777 /opt/advantech/tools/serial_port.sh
sudo bash /opt/advantech/tools/serial_port.sh rs485 com1
sudo bash /opt/advantech/tools/serial_port.sh rs485 com2

3. Run the Test Script

Use the serial_test.py script from the SERIAL_TEST_MIC-733AO.tar.gz archive to perform the test. Designate one port as the server (listener) and the other as the client (sender).

• Device for COM1: /dev/ttyTHS2
• Device for COM2: /dev/ttyTHS1

Open two separate terminals:

• In Terminal 1 (COM1 as Server):

  sudo python3 serial_test.py 485 /dev/ttyTHS2

• In Terminal 2 (COM2 as Client):

  sudo python3 serial_test.py 485 /dev/ttyTHS1 "hello"

The server terminal should receive and display the "hello" message from the client.

RS232 Test Procedure

1. Hardware Connection

For the RS232 loopback test, connect two DB9 connectors using a null modem configuration:

From COM1	To COM2
Pin 2	Pin 3
Pin 3	Pin 2
Pin 7	Pin 8
Pin 8	Pin 7

2. Configure COM Port Mode

Open a terminal and execute the following commands to set both COM1 and COM2 to RS232 mode.

sudo chmod 777 /opt/advantech/tools/serial_port.sh
sudo bash /opt/advantech/tools/serial_port.sh rs232 com1
sudo bash /opt/advantech/tools/serial_port.sh rs232 com2

3. Run the Test Script

Use the same test script as in the RS485 test.

• Device for COM1: /dev/ttyTHS2
• Device for COM2: /dev/ttyTHS1

Open two separate terminals:

• In Terminal 1 (COM1 as Server):

  sudo python3 serial_test.py 232 /dev/ttyTHS2

• In Terminal 2 (COM2 as Client):

  sudo python3 serial_test.py 232 /dev/ttyTHS1 "hello"

The server terminal should successfully receive and display the message sent from the client.