• Key Features
  • Standard Features
  • Advanced Features
  • Device Support
  • Protocols / Networks
  • Videos & App Notes
  • Help Files & Release Notes
  • Technical Blog
  • Additional Resources

Modbus ASCII Serial Key Features Include

  • Maximum Number of Channels & Devices: 
    • Channels - 100
    • Devices per Channel - 247
    • COM Port Range - 1 to 999
    • NOTE: Practical channel/device limits will vary depending on your available system resources
  • Flexible configuration settings for compatibility with a wide range of Modbus-capable devices
  • Automatic Tag Database Generation (from Concept or ProWORX)
  • Supports Modbus ASCII Multi-drop
  • Supports all memory types and data types
  • Supports Word Order and Byte Order Swapping
  • Modem Support (Automatic Dial Configuration and Multiple Phone Number Management)
  • Supports User Definable Read Block Sizes
  • Direct Support for Flow Automation and Flow Computers
  • Supports Ethernet Encapsulation via Ethernet/Serial convertors, Ethernet Device or Terminal servers

Standard Modbus ASCII Serial Features Include

  • Modbus Function Codes Supported: (Blog post - demystifying Modbus Function Codes)
    • Decimal - 01, 02, 03 ,04, 05, 06, 16
    • Hexadecimal - 01, 02, 03 ,04, 05, 06, 10
  • Full Address Range Support: 0xxxx - Output Coils, 1xxxx - Input Coils, 3xxxx - Internal Registers, 4xxxx - Holding Registers
  • Decimal or Hex Addressing Support
  • String Block Read Support
  • Supports all memory types and data types such as Float, Long Word, and BCD
  • String Data Type support for Internal Registers
  • String Block Read Support
  • Base Modbus device model supports 32-Bit Data Types as Two Registers
  • Automatic Tag Database Generation using CSV Import
  • Tag configuration supports dynamic tags from your client application


Modbus ASCII Serial Driver Advanced Features Include

  • Adjustable Address Base ( 0 or 1 )
  • Selectable Function Code for Single Address Writes
  • Word Order Swapping for Float and Long Data Types
  • Byte Order Swapping on all 16 bit and 32 bit values
  • User Definable Read Block Sizes
  • Holding register memory access as string data (HiLo or LoHi byte order)
  • Channel Serialization (Virtual Channels allow multi-protocol support on the same communication channel)
  • Ethernet Encapsulation Support
  • Dial-Up Modem Support
  • Adjustable RTS Flow timing for Radio Modem communications
  • Configurable Inter-request delay
  • Modbus ASCII Multi-Drop Serial Communications
  • Auto Device Demotion Support to optimize communication with responsive devices
  • Supports Broadcast Messages using Device ID 0
  • Automatic Tag Database Generation (from Concept or ProWORX)
  • Connection Sharing Support for using multiple protocols over the same COM Port or modem connection

Modbus ASCII Serial Supported Devices

  • Modbus ASCII Compatible Devices
  • Flow Computers

For full details on models and networks supported visit the Modbus Suite Supported Devices page and consult the driver help file.

Modbus ASCII Serial Supported Protocols / Networks

  • Modbus ASCII Serial Protocol
  • Serial RS-232
  • Serial RS-422
  • Serial RS-485
  • Ethernet Encapsulated Serial - for using Ethernet/Serial convertors, Device Servers, or Terminal server hardware from a variety of suppliers.

Videos / Guides / App Notes to Help You Get Started

To insure you get the most from your investment in TOP Server™, we provide a variety of application notes/guides and how-to videos, since we know that sometimes it helps to see someone showing you how to do things.

Driver Help Files / Release Notes

Use the below links to access TOP Server release history and driver help documentation.

Access use cases, how-tos and more

Real-world use cases, step-by-step how-to's and video tutorials - our blog contains useful resources and information to help you get connected.

Modbus Specific Blog Posts

TOP Server Specific Blog Posts

Overall Software Toolbox Blog Posts

Subscribe to Blog

Additional Useful Resources

Access additional TOP Server related information below not covered in other sections:

Get Started Now

The demo is the full product once licensed. Once a client application connects to the  TOP Server, the TOP Server runtime will operate for 2 hours at a time. At the end of the 2 hour demo period, the demo timer must be reset by restarting the TOP Server runtime service.

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