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Module 5: External Communication Interface

20212m

Which protocol standard of serial communication specifies the bi-directional and half-duplex form of data transmission by allowing various numbers of drivers and receivers in bus configuration?
(i) RS232
(ii) RS2485
(iii) RS422
(iv) RS423

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Answer: (ii) RS485 (option typed as RS2485)

Explanation: RS485 is the bi-directional half-duplex differential bus standard allowing up to 32 drivers/32 receivers on same bus, ideal for multi-drop networks. RS232 is single-ended point-to-point, RS422 is differential but unidirectional multi-drop (one driver, multiple receivers), RS423 similar. The typo RS2485 means RS485.

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