3.
SPECIFICATIONS
MELSEC-A
I
(2) AJ71C24 operation contents when a request to switch the mode is
,-
9
accepted
1
AJ71 C24 mode switching is requested by using the AJ71C24 buffer's
d
mode switching designation area (address 11 9H).
When a mode switching request is accepted, the AJ71 C24 executes the
7
Y
following operations:
I
1
:..
..
,.
-
-
First turns OFF the AJ71 C24 READY signal (Xn7).
Initializes the AJ71 C24 and starts it up (takes about six seconds).
During this operation, the following processings take place at the
same time:
0
Set data
in
the special applications area of the AJ71C24 buffer
(addresses 1 OOH to 11 FH) is returned to the default state (except
for address 11 9H).
0
Received data (stored
in
the AJ71C24's buffer and the
OS
area)
during data communications
in
the
no-protocol/bidirectional
mode
is
cleared.
Turns
ON
the AJ71C24 READY signal (Xn7).
Switches the higher bytes in the AJ71C24 buffer's mode switching
designation area (address 119H) from 01
H
to 02H.
The mode switching operation is completed.
Example:
When switching the RS-232C to the no-protocol mode and the
RS-422 to the dedicated protocol (format 1) mode respectively
i
!
(4)
I
Data
in
An1
C24
buffer
address
119H
(3)
Mode switching from an external device
(a) After switching the mode, an external device cannot be used to
switch set data in the AJ71C24 buffer's special applications area.
If set data must be changed after switching the mode, write neces-
-7
sary
data from the PC CPU (see Section 3.4.2 for the write timing).
j~
-
When set data is not changed from the
PC
CPU, communicate by
using the default data
in
the special applications area.
3-
17
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