P
L..
.
F
LT
3.
SPECIFICATIONS
,
,.
MELSEC-A
(b) When both the RS-232C and RS-422 are set to the no-protocol
mode (mode switching designation data
in
Ol09H), the mode can-
not
be
switched
by
using an external device.
(This is because data cannot be written from the external device to
the buffer's special applications area.)
I
POINT
I
1
r
Mitsubishi recommends using a PC CPU for mode switching.
I
I
I
(4) Operations
in
response to a mode switching request when the data
communications has not been completed
(a) When data communications
in
the dedicated protocol has not been
completed, receiving a mode switch request will switch the mode
after data communications has been completed (after transmitting
data in area
B
(see Section 8.3)).
Example:
Ai7l-4
\
191
---
h
(b) When communicating data
in
the
no-protocol/bidirectional
modes,
the AJ71 C24 switches the mode under the following conditions:
1)
When the AJ71C24 request-to-send signal (v(n
t
1)0) is
ON,
turn-
ing
OFF
the send-completed signal (XnO) switches
the
mode,
Exmnnld.vi9
Ai71C24
ma
h
I*
I
t
wmth.md-ompl4d.igulq(nqgor~,
h.inHid~pmr*lo(mod.r+hng)k.auAd.
When this happens,
if
the request-to-send signal to the PC CPU has
not been turned
ON,
the received data (stored
in
the AJ71 C24 buffer
and the
OS
area)
will
be
cleared.
3-
18
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