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1. If the DR signal of the HD-6402 UART is high and new serial data arrives, what condition will result, and how the will the UART respond?

a) The receiver will be "overrun," and the OE signal will go high
b) The transmitter will run out of data, and the PE signal will go high
c) A parity error will be detected, and the TBRE signal will go low
d) None of the above

2. If the TRE signal of the HD-6402 UART goes high and stays high for a long time (for example, several character periods), then what could be concluded about the general state of the device?

a) Data is about to be emitted at the TRO pin
b) Data is waiting at the receiver parallel output pins
c) Both the transmit holding register and transmit shift register are empty, and no data is being transmitted
d) None of these conclusions can be reached

3. If the TBRE signal is a logic 1, what must a computer do before clocking parallel data into the UART transmitter?

a) The computer must wait until (TBRE == 0)
b) The computer must pulse SFD high for at least 1 ms
c) Nothing, the UART is ready for data
d) None of the above

4. In order to get the parameters 7,N,2, what HD-6402 UART control input values are needed?

a) CRL=1, CLS2=0, CLS1=0, SBS=0, PI=1, EPE=X
b) CRL=1, CLS2=1, CLS1=1, SBS=0, PI=0, EPE=1
c) CRL=1, CLS2=1, CLS1=0, SBS=1, PI=1, EPE=X
d) None of the above

5. If the HD-6402 UART is programmed with SBS=1, what can be possibly concluded?

a) The device receiving the data at the other end of the wire need a parity bit.
b) The receiving device is slow and needs extra space between characters
c) The EBCDIC character 8-bit character set is in use.
d) None of the above

6. Which UART section converts parallel data to serial data?

a) Transmitter
b) Receiver
c) Control
d) Status
e) None of the above

7. What architectural feature of the HD-6402 UART helps to prevent gaps between transmitted characters?

a) Double-buffering
b) Tri-state outputs
c) Internal control logic
d) None of the above

8. In order to get the parameters 8,E,1, what HD-6402 UART control input values are needed?

a) CRL=1, CLS2=0, CLS1=0, SBS=0, PI=1, EPE=X
b) CRL=1, CLS2=1, CLS1=1, SBS=0, PI=0, EPE=1
c) CRL=1, CLS2=1, CLS1=0, SBS=1, PI=1, EPE=X
d) None of the above

9. What data rate will result on the HD-6402 UART if the clock frequency is 16 kHz?

a) 1000 bps
b) 1200 bps
c) 2400 bps
d) 8000 bps
e) None of the above

10. What are the two signals used for handshaking on the HD-6402 receiver?

a) SBS and CRL
b) TBRE and /TBRL
c) DR and /DRR
d) None of the above

11. What type of connector is found on an RS232 DTE?

a) DB25M
b) DB9M
c) DB25F
d) None of the above

12. What device will allow you to connect a DB25M cable connector into a DB25M socket?

a) Gender Mender
b) Null Modem
c) Interface Dongle
d) None of the above

13. A DTE receives data on RS232 pin ____ , and a DCE receives data on pin _____. Pick the response that correctly fills both blanks.

a) 2,4
b) 3,2
c) 5,6
d) None of the above

14. An RS232 control pin measures -2.05 V. What is its state?

a) Logic 1, "off"
b) Logic 0, "on"
c) Logic 1, "on"
d) Illegal state
e) None of the above

15. What is the correct range of voltages for a logic "0" on an RS232 interface?

a) -3 to -15 V
b) 3 to 15 V
c) 3 to 25 V
d) -3 to -25 V
e) None of the above

16. Which of the pins below are usually swapped in an RS232 crossover cable?

a) 2 and 3
b) 4 and 8
c) 3 and 4
d) 6 and 7
e) None of the above

17. The PESA RM3500 video switcher is configured as a DCE and has a DB25F RS232 connector. A personal computer is a DTE and has a DB25M connector. Therefore, the two devices are compatible according to the RS232 standard and communication between them is guaranteed.

a) True
b) False

18. Which of these devices is usually implemented as a DTE under the RS232 standard?

a) Printer
b) Computer
c) Modem
d) None of the above

19. What pin number must always be connected on an RS232 interface?

a) 1
b) 2
c) 3
d) 4
e) 5
f) None of the above

20. Which of these devices is usually implemented as a DCE under the RS232 standard?

a) Printer
b) Computer
c) Smart Terminal
d) None of the above

21. What feature MUST be supported by any USB device that draws power from the bus?

a) Isochronous mode
b) Bulk mode
c) Sleep (power-down) mode
d) None of the above

22. Devices can be powered from the USB port. What is the maximum current that can be drawn from a computer's USB port?

a) 100 mA
b) 500 mA
c) 1000 mA
d) None of the above

23. What USB communications mode would be used for devices that send large amounts of data (usually in blocks) and require error detection and correction?

a) Interrupt mode
b) Bulk mode
c) Isochronous mode
d) None of the above

24. What is the maximum data transfer rate for any single peripheral on a USB interface?

a) 1 Mb/s
b) 2 Mb/s
c) 12 Mb/s
d) None of the above

25. How many physical devices are allowed on the universal serial bus?

a) 31
b) 63
c) 127
d) None of the above

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