User`s manual

7-34
ASCII code
3A
HEX
3F
HEX
23
HEX
25
HEX
0D
HEX
Contents
Header (Indicates beginning of command and
response.)
Indicates command.
Indicates response.
Indicates error response.
Terminal mark (Indicates termination of a command and
response.)
ASCII
characters
: (colon)
? (question)
# (number mark)
% (percent)
CR
(carriage return)
(1) Identification symbol
(2) Slave station No. AD (H), AD (L)....ASCII characters 01 to 37(8)
In the "command," specify a slave station number, 01 to 37(8), to be controlled by the host computer.
In the "response," specify a slave station number, 01 to 37(8), to send to the host computer.
(3) Response time RI....ASCII characters 0 to F(H)
The response time RI refers to the interval after the slave station performs the "command" from the
host computer until it sends the "response" back.
Set the response time RI between 0 and F(H) (0 to 600 ms), to match the processing capacity of the
host computer.
As the JW300 accesses memories after one scan cycle, the actual response time is the total of
setting value of RI in command and the waiting time of one operation cycle.
[Ex.] Monitor relay 002000 on PLC01 (when the scan cycle is 10 ms and the response time is 40
ms)
[Reference] Setting response time RI
It is difficult to recommend the optimum response time, as the optimum response
time is varied depending on the model of personal computer, the programming
language and the system program. First, set a fairly long time, then, shorten gradually.
Note
There are some limits for handling bit numbers by commands and for the communication buffer of
personal computers. Be careful for handling bit numbers and communication buffers.
0
1
2
3
RI(H) Response time (ms) Response time (ms) Response time (ms) Response time (ms) RI(H) RI(H) RI(H)
0
10
20
30
4
5
6
7
40
50
60
70
8
9
A
B
80
90
100
200
C
D
E
F
300
400
500
600
Command
: : 0 1 ? 4 M R L 0 0 2 0 0 0 1 F
Waiting
time
Receiving
command
Reading
Sending response
Setting response time : 40 ms
C
R
Scan cycle 10ms