ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 90

Which is a physical layer standard for serial communications between two or more devices?

Answer options

• A. RS232
• B. RS235
• C. RS432
• D. RS485

Correct answer: D

Explanation

RS485 is a standard that enables serial communication over long distances between multiple devices, making it ideal for networked applications. RS232, RS235, and RS432 are either outdated or do not support the same level of multi-device communication as RS485.