What type of communication protocol does Modbus RTU use?

What type of communication protocol does Modbus RTU use?
A . UDP
B . ICMP
C . Serial
D . SSTP

View Answer

Answer: C

Explanation:

Modbus RTU (Remote Terminal Unit) is a communication protocol based on a master-slave architecture that uses serial communication. It is one of the earliest communication protocols developed for devices connected over serial lines. Modbus RTU packets are transmitted in a binary format over serial lines such as RS-485 or RS-232.

Reference: Modbus Organization, "MODBUS over Serial Line Specification and Implementation Guide V1.02".