Serial communication

MODEM is an example of 

• DTE

• DCE

• EIA

• TIA

In RS-232 transmitter -   Logic 1 represents

• +5 to +25 V

• -5 to -25 V

• + 3to +25 V

• - 3to -25 V

DB 9 Connector  - 7 th pin represents

• Signal/Common Ground

• RTS

• CTS

• RI

Multi point System supported in

• RS 232

• RS 422

• RS 485

• RS 232 C

Serial communication is  _____________ than parallel communication but used for _______________due to lower cost and practical reasons

• slower & long data transmission

• Moderate & short data transmission

• slower & Short data transmission

• Faster & long data transmission

In RS485 ,  the termination resistor value depends on the cable used and is typically 

• 120 Ω

• 12Ω

• 100 Ω

• 1 Ω

4-wire version uses ---------- number of twisted pairs

(a)  

How many  line drivers can be used on the same line in RS485?

• 10

• 20

• 32

• 64

The distance limitation of RS232 is ----------------

(a)  

What is the function of the CTS (Clear To Send) line in RS-232?

• Indicates the DTE is ready

• Transmits actual data

• Signals that DCE is ready to receive

• Controls baud rate