Aspar RS485 User Manual
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Aspar RS485 User Manual

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RS485 MODBUS Module 8AO
Expansion Module – 8 analog outputs
Version 1.6
User Manual
Manufactured for

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Summary of Contents for Aspar RS485

  • Page 1 RS485 MODBUS Module 8AO Expansion Module – 8 analog outputs Version 1.6 User Manual Manufactured for...
  • Page 2 RS485 MODBUS Module 8AO User Manual Thank you for choosing our product. This manual will help you with proper support and proper operation of the device. The information contained in this manual have been prepared with utmost care by our professionals and serve as a description of the product without incurring any liability for the purposes of commercial law.

  • Page 3: Safety Rules

    (0-20mA or 4-20mA) or as a voltage output (0-10V). Setting the output curent or voltage value is done via RS485 (Modbus protocol), so you can easily integrate the module with popular PLCs, HMI or PC equipped with the appropriate adapter.

  • Page 4: Technical Specifications

    RS485 MODBUS Module 8AO User Manual 2.2. Technical Specifications Voltage 10-38VDC; 10-28VAC Power Supply Maximum Current 120 mA @ 12V / 100 mA @ 24V No of outputs Voltage output 0V do 10V (resolution 1.5mV) Current output 0mA do 20mA (resolution 5μA) Outputs 4mA do 20mA (value in ‰...

  • Page 5: Dimensions Of The Product

    RS485 MODBUS Module 8AO User Manual 2.3. Dimensions of the product Look and dimensions of the module are shown below. The module is mounted directly to the rail in the DIN industry standard. Power connectors, communication and IOs are at the bottom and top of the module. USB connector configuration and indicators located on the front of the module.

  • Page 6: Communication Configuration

    Both ends must be terminated since the direction of propagation is bi- directional. In the case of an RS485 twisted pair cable this termination is typically 120 Ω.

  • Page 7: Types Of Modbus Registers

    RS485 MODBUS Module 8AO User Manual 3.4. Types of Modbus Registers There are 4 types of variables available in the module Beginning Modbus Type Variable Access address Command 00001 Digital Outputs 1, 5, 15 Read & Write 10001 Digital Inputs...

  • Page 8: Configuration Registers

    RS485 MODBUS Module 8AO User Manual 3.5.3. Configuration registers Modbus Name Values Address 0 – 2400 1 – 4800 2 – 9600 3 – 19200 40003 0x02 Baud rate 4 – 38400 5 – 57600 6 – 115200 other – value * 10 0 –...
  • Page 9 RS485 MODBUS Module 8AO User Manual 4. Indicators 8 outputs state Power Supply Communication Indicator Description Power supply LED indicates that the module is correctly powered. Communication The LED lights up when the unit received the correct packet and sends the answer.

  • Page 10: Module Connection

    RS485 MODBUS Module 8AO User Manual 5. Module Connection Expansion Module – 8 analog outputs User Manual Version 1.6 10 / 15...

  • Page 11: Setting Output Mode

    RS485 MODBUS Module 8AO User Manual 6. Setting output mode To change output mode from current to voltage you should set appropriate values of registers (40069 – 40076) and change the position of jumper inside the module according to following picture.

  • Page 12: Modules Registers

    RS485 MODBUS Module 8AO User Manual 8. Modules Registers 8.1. Registered access Modbus Dec Hex Register Name Access Description 30001 0 0x00 Version/Type Read Version and Type of the device 30002 1 0x01 Switches Read Switches state 40003 2 0x02 Baud rate Read &...

  • Page 13: Bit Access

    RS485 MODBUS Module 8AO User Manual Modbus Dec Hex Register Name Access Description 40070 69 0x45 Output 2 setting Read & Write 40071 70 0x46 Output 3 setting Read & Write 0 – output disabled 40072 71 0x47 Output 4 setting Read &...

  • Page 14: Configuration Software

    RS485 MODBUS Module 8AO User Manual 9. Configuration software Modbus Configurator is software that is designed to set the module registers responsible for communication over Modbus network as well as to read and write the current value of other registers of the module. This program can be a convenient way to test the system as well as to observe real-time changes in the registers.
  • Page 15 2.2. Technical Specifications......................4 2.3. Dimensions of the product.......................5 3. Communication configuration......................6 3.1. Grounding and shielding......................6 3.2. Network Termination.......................6 3.3. Setting Module Address in RS485 Modbus Network..............6 3.4. Types of Modbus Registers......................7 3.5. Communication settings......................7 3.5.1. Default settings........................7 3.5.2. Restore the default configuration..................7 3.5.3.
  • Page 16 Current Voltage Output No output output (default)

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