PDDAXLQUE CP24 Bluetooth to RS485 Serial Converter User Manual

1. Introduction

The PDDAXLQUE CP24 is a multi-function Bluetooth Wireless Converter designed to enable wireless data communication between devices via the RS485 interface. It supports Bluetooth Low Energy (BLE 5.1) and is suitable for various industrial IoT applications, replacing traditional wired connections with convenient wireless solutions.

Figure 1: CP24 Bluetooth to RS485 Serial Converter and optional USB adapter

Key Features:

• Converts 485 interface devices to Bluetooth wireless transmission.
• Supports wireless debugging and viewing of 485 device parameters via Android/Apple mobile phones or computers.
• Supports ModBus protocol, allowing for ModBus wireless communication networks.
• Enables master-slave connections for wireless communication between devices.
• Wide power supply range: DC5-36V.
• Visible transmission distance up to 420 meters (in unobstructed, open areas).

2. Specifications

Figure 2: CP24 Basic Parameter List and dimensions

3. Setup

3.1 Package Contents

• CP24 Adapter x1
• Rubber Stick Antenna x1
• RJ45 Plug to 4P 5.0mm Terminal Block x1
• CP24 Instruction Manual x1
• CP11 USB Bluetooth Adapter x1 (for PC control variant)

3.2 Hardware Connection (CP24 Module)

The CP24 module features several interfaces and indicators:

Figure 3: CP24 Product Schematic with pinout and indicators

1. A+ (485 interface): Connect to the A+ terminal of your RS485 device.
2. B- (485 interface): Connect to the B- terminal of your RS485 device.
3. VCC (Power supply interface): Connect to a DC5-36V power source.
4. GND (Power supply interface): Connect to the ground of your power source.
5. ANT (External antenna interface): Screw the provided rubber rod antenna onto this port.

3.3 Connecting to a Desktop Computer (with CP11 USB Adapter)

For desktop computers without built-in Bluetooth or for enhanced stability, use the CP11 USB Bluetooth adapter:

1. Connect the CP24 module to your target device via the RS485 interface (A+, B-, VCC, GND).
2. Install the "CH341" driver on your PC. This driver is typically found in the kit's data package.
3. Plug the CP11 USB Bluetooth adapter into an available USB port on your computer.
4. Install and open the `sscom5.13.1` PC serial port software.
5. In the software, select the COM port corresponding to the CP11 adapter.
6. Configure the serial port software with the default parameters: 9600bps/8/n/1 (baud rate/data bits/no parity/stop bit).
7. The CP11 adapter will actively search for and connect to the CP24 Bluetooth adapter.
8. Once connected, you can interact with the data through the computer software.

Figure 4: Software diagram of serial port on computer side

3.4 Connecting to a Laptop (with Built-in Bluetooth)

For laptops with built-in Bluetooth (Windows 10 or below; Windows 11 requires a separate Bluetooth adapter):

1. Connect the CP24 module to your target device via the RS485 interface.
2. On your computer, open Bluetooth settings and search for Bluetooth devices.
3. Search for the device named 'RS232\485' and enter the pairing code '1234' to connect.
4. Once connected, you can interact with the data through your computer's software.

Figure 5: Computer Bluetooth Add Device Diagram

3.5 Connecting to a Mobile Phone (Android/Apple)

1. Connect the CP24 module to your target device through the RS485 interface.
2. Install the Android test APP (provided in the data package) on your mobile phone.
3. Open the 'Bluetooth parameter setting' section within the APP. Ensure your phone's Bluetooth and location services are enabled.
4. Search for the connection module. After finding the Bluetooth name, tap it to connect.
5. Tap "Query" to retrieve the default parameters of the module.
6. Modify any necessary Bluetooth parameters within the APP, then tap "Set" to apply changes.

Figure 6: Android App Interface for Parameter Modification

4. Operating Instructions

4.1 Indicator Lights

The CP24 module has three indicator lights:

• WORK (BLE Status Indicator):
  • Not connected: The blue light blinks. The number of flashes indicates the current baud rate (see Baud Rate Switching below).
  • Connected: The blue light remains steadily on.
• RX (Data Receive Indicator): The blue light blinks when the module is receiving data.
• TX (Data Transmission Indicator): The blue light blinks when the module is sending data.

Figure 7: CP24 Hardware Construction Description

4.2 Baud Rate Switching

The baud rate can be switched using the KEY button on the CP24 module:

1. Ensure the module is in an unconnected Bluetooth state.
2. Double-click the KEY button consecutively. Each double-click will switch the baud rate.
3. The number of times the blue WORK light flashes indicates the current baud rate setting:

The default baud rate is 9600bps with 8 data bits, no parity, and 1 or 2 stop bits (9600bps/8/n/1 or 2).

4.3 Data Interaction

Once the CP24 module is successfully connected to your computer or mobile phone, data interaction can be performed using the respective serial port software or mobile application. The module facilitates seamless wireless data transfer between the connected RS485 device and your control interface.

4.4 ModBus Wireless Communication

The CP24 supports the ModBus protocol, allowing it to form a ModBus wireless communication network. This enables multi-device connections and master-slave configurations for industrial control systems.

Figure 8: 485-ModBus Wired to Wireless Multi-Connection Diagram

The wireless data communication of the 485 interface is realized as follows:

1. Connect the CP24 Master module to Device 1 via the RS485 interface.
2. Connect the CP24 Slave module(s) to Device 2 (and other devices) through their respective RS485 interfaces.
3. Establish the Bluetooth connection between the CP24 Master and CP24 Slave modules.
4. Once connected, data interaction can occur between the devices.

Figure 9: CP24 Data Flow Diagram

5. Application Scenarios

The CP24 converter is versatile and can be used in various industrial and control applications:

Figure 10: Bluetooth to RS485 Application Scenarios

• Touch screen control PLC application diagram
• Computer update PLC programme application diagram
• Computer view meter data application diagram (e.g., wattmeter)
• Application diagram for setting inverter parameters by mobile phone
• Application diagram for setting lift parameters by computer
• Application diagram for setting servo motor parameters on mobile phones
• Application chart for setting textile machine parameters by computer
• Mobile phone view of monitoring tower data application diagram

Other applications include:

Figure 11: Diverse Application Scenarios

6. Maintenance

To ensure the longevity and optimal performance of your CP24 Bluetooth to RS485 Serial Converter, please follow these maintenance guidelines:

• Cleaning: Keep the device clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid liquid cleaners.
• Storage: Store the device in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
• Handling: Handle the device with care to prevent physical damage. Avoid dropping or subjecting it to strong impacts.
• Antenna: Ensure the antenna is securely attached but do not overtighten. Avoid bending or damaging the antenna.
• Power Supply: Always use a power supply within the specified DC5-36V range. Incorrect voltage can damage the device.

7. Troubleshooting

If you encounter issues with your CP24 converter, refer to the following troubleshooting tips:

• No Power/Indicators Off:
  • Check the power supply connection and ensure it is within the DC5-36V range.
  • Verify that the power source is active.
• Unable to Connect via Bluetooth:
  • For PC with CP11 adapter: Ensure the CH341 driver is correctly installed. Check if the CP11 adapter is properly plugged into the USB port. Verify the COM port selection in the serial software.
  • For PC with built-in Bluetooth: Ensure your computer's Bluetooth is enabled and discoverable. Confirm the pairing code '1234' is entered correctly.
  • For Mobile Phone: Ensure your phone's Bluetooth and location services are enabled. Verify the correct APP is installed and running.
  • Check if the CP24 module is within the effective transmission range (up to 420m in open areas). Obstacles can significantly reduce range.
• Data Transmission Issues:
  • Verify that the baud rate of the CP24 module matches the baud rate configured in your software/app and the connected RS485 device. Double-click the KEY button to cycle through baud rates if needed.
  • Check the RX/TX indicator lights on the CP24 module to see if data is being sent or received.
  • Ensure the RS485 wiring (A+ and B-) is correct and secure.
  • Confirm that the connected RS485 device is functioning correctly.
• Intermittent Connection:
  • Reduce the distance between the CP24 module and the controlling device (PC/phone).
  • Minimize obstructions between the devices.
  • Check for sources of electromagnetic interference.

8. User Tips

• Optimal Range: While the device boasts a 420m visible distance, actual performance can vary greatly depending on environmental factors like walls, metal structures, and other wireless signals. For critical applications, test the connection stability at your desired operating distance.
• Baud Rate Matching: The most common cause of communication failure is mismatched baud rates. Always confirm that the CP24's baud rate (indicated by WORK light flashes) matches your RS485 device and control software.
• Driver Installation: For PC connections using the CP11 adapter, ensure the CH341 driver is installed correctly before attempting to connect. Incorrect driver installation can prevent the COM port from being recognized.
• Mobile App Permissions: When using the mobile app, grant all necessary permissions, especially Bluetooth and location, for proper device discovery and connection.
• Power Supply Stability: Use a stable and clean DC5-36V power supply to avoid unexpected behavior or damage to the module.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.