Information Technology Reference
In-Depth Information
18.4 Exercises
18.4.1
What is the basic topology of a Modbus network:
(a)
One or many masters and one slave
(b)
One or many master and one or many slaves
(c)
One master and one slave
(d)
One master and one or many slaves
18.4.2
How is the start of an ASCII message frame identified:
(a)
01111110
(b)
':'
(c)
Start bit (a 1)
(d)
LFCR (line feed, carriage return)
18.4.3
What is the maximum number of nodes on a Modbus network:
(a)
8
(b)
256
(c)
1024
(d)
No limit
18.4.4
What is the addressing range for the Modbus protocol:
(a)
00h-FFh
(b)
0000h-FFFFh
(c)
000000h-FFFFFFh
(d)
No limit
18.4.5
Determine the LRC (in hex) that is to be added to the message transmission of
4F2A10h:
(a)
89h
(b)
77h
(c)
88h
(d)
76h
18.4.6
Determine the LRC (in binary) that is to be added to the message transmission of
1000 1100 0001 0110 1111 0110b:
(a)
01101000b
(b)
10011000b
(c)
00000000b
(d)
01100111b
18.4.7
What ASCII characters are transmitted for the data transmission of 1010 0011
1110 1010b:
(a)
'10', '3', '15', 'A'
(b)
'1', '0', '3', '1', '5', 'A'
(c)
'A', '3', 'E', 'A'
(d)
'0', '1', '3', '5', '1', 'A'
