Information Technology Reference
In-Depth Information
(b)
No connections to TD and RD lines
(c)
Cross-over between the TD and RD, and handshaking lines
(d)
No hardware handshaking lines
13.6.8
The main connections used to transmit data over a null modem cable with no
hardware handshaking are:
(a)
TD, RD, GND
(b)
RTS, CTS, GND
(c)
DSR, DTR, GND
(d)
TD, RD, RTS, CTS
13.6.9
If a device transmits at 9600 bps, approximately how many characters are
transmitted every minute:
(a)
5 760
(b)
57 600
(c)
576 000
(d)
5 760 000
13.6.10
If a device transmits at 4800 bps, approximately what is the period of a single bit:
(a)
2.08
s
(b)
20.8
s
µ
µ
(c)
208
s
(d)
2.08 ms
µ
13.6.11
Which handshaking line is used by a transmitter to identify that it is read to send
data:
(a)
RTS
(b)
CTS
(c)
DTR
(d)
DTE
13.6.12
Which handshaking line is used by a receiver to identify that it is ready to receive
data:
(a)
RTS
(b)
CTS
(c)
DTR
(d)
DTE
13.6.13
Which characters are used to start and stop data transfer in software handshaking:
(a)
X-ON, X-OFF
(b)
OFF, ON
(c)
IN, OUT
(d)
LF, CR
13.6.14
Which is the standard I/O port address for COM1:
(a)
1F8h
(b)
2F8h
(c)
3F8h
(d)
4F8h
13.6.15
Which is the standard I/O port address for COM2:
(a)
1F8h
(b)
2F8h
(c)
3F8h
(d)
4F8h
13.6.16
The standard IC used in RS-232 communications is:
