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Eccouncil ICS-SCADA Exam - Topic 3 Question 39 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam
Question #: 39
Topic #: 3
[All ICS-SCADA Questions]

What type of communication protocol does Modbus RTU use?

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Suggested Answer: C

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'.


by Devora at Mar 08, 2026, 01:47 PM

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Kimbery
18 days ago
100% agree, it's Serial!
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Ahmed
23 days ago
I thought it was UDP?
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Mirta
28 days ago
It's definitely C) Serial.
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Abel
1 month ago
I thought Modbus was over Ethernet, this is surprising!
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Louvenia
1 month ago
C is correct, but I thought it was outdated.
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Meaghan
1 month ago
Wait, are you sure it's not UDP?
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Josephine
2 months ago
Definitely C) Serial, no doubt about it.
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Lizette
2 months ago
Modbus RTU uses serial communication!
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Amina
2 months ago
I vaguely recall that Modbus RTU is used in serial communication, but I should double-check that before answering.
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Melda
2 months ago
I feel like I might confuse Modbus with something else, but I want to say it's not UDP or ICMP.
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Carlene
2 months ago
I remember practicing a question about Modbus, and I think it was definitely related to serial communication.
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Corazon
2 months ago
I think Modbus RTU uses a serial communication protocol, but I'm not entirely sure.
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