MODBUS Decoder

HScope provides support for Modbus RTU over RS485.

Frame Format

The set of function field and data field is called Protocol Data Unit (PDU) and represents the useful part of communication.

HScope can recognize the following functions:

Decoding in HScope

Input range: at least 5V
Sampling rate: at least 100KSa/s for a baud rate up to 19200, 500KSa/s for 112500
Use the digital module to enable the decoding

Sample of HScope decoded data:

What is MODBUS

Modbus is an industrial protocol that was developed in 1979 to make communication possible between automation devices. Originally implemented as an application-level protocol intended to transfer data over a serial layer, Modbus has expanded to include implementations over serial, TCP/IP, and the user datagram protocol (UDP).

Typical communication speed is from 9600 to 115200b/s.