Driver Details






TOP Server Modbus Suite OPC & I/O Server

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Modbus RTU Slave Driver Details

This driver is a member of the TOP Server Modbus Suite OPC Server.  When you download or purchase the Modbus Suite, this driver is included along with all the TOP Server built-in features. This driver allows client software to appear as Modbus RTU Slave devices on the Modbus RTU network.  This slave mode allows the server to receive data by exception from Modbus RTU Masters, whether they are actual PLC’s or devices acting as Modbus RTU Masters or other software applications capable of sending Modbus RTU Master requests.

TOP Server OPC Certified



Modbus Serial RTU Slave ConnectivityProtocols Supported:

  • Modbus RTU Serial Protocol
  • JBus RTU Serial Protocol

Devices Supported - Click Here

Physical Networks Supported:

  • Serial RS-232
  • Serial RS-422
  • Serial RS-485
  • Ethernet Encapsulated Serial (Details)


  • Static tags must be configured in the TOP Server for this driver to receive messages.

Click to Access Modbus RTU Slave Help File

Maximum Number of Channels & Devices Supported:

  • Channels - 100
  • Devices - 247
  • COM Port Range - 1 to 999

Modbus Function Codes Supported:

  • Decimal - 01, 02, 03, 04, 05, 06, 08, 15, 16
  • Hexidecimal - 01, 02, 03, 04, 05, 06, 08, 0F, 10

Standard Modbus Features

  • Full Address Range Support: (Application Note)
    • Output Coils:  000001 - 065536
    • Input Coils:  100001 - 165536
    • Internal Registers:  300001 - 365536
    • Holding Registers:  400001 - 465536
  • Decimal or Hex Addressing Support
  • Supports all memory types and data types such as Float, Long Word, and BCD
  • Base Modbus device model supports 32-Bit Data Types as Two Registers
  • String Data Type support for Internal Registers
  • See CSV Import to build your tag configuration quickly
  • Tag configuration supports dynamic tags from your client application

Modbus Unsolicited Memory Settings

Advanced Driver Features:

  • Simulates up to 247 Modbus RTU Slave devices
  • Adjustable Address Base ( 0 or 1 )
  • Word Order Swapping for Float and Long Data Types
  • User Definable Read Block Sizes
  • Holding register memory as string data (HiLo or LoHi byte order)
  • Ethernet Encapsulation
  • Dial-Up Modem Support
  • Adjustable RTS Flow timing for Radio Modem communications
  • Modbus RTU Multi-Drop Serial Communications
  • Supports receiving Broadcast Messages using DEVICE ID 0



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