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7.
INITIAL SETTING OF TRANSMISSION CONTROL DATA TO
BUFFER MEMORY
MELSEC-A
7.
INITIAL SElTING OF TRANSMISSION CONTROL DATA TO BUFFER MEMORY
The buffer memory has a special applications area for setting transmission
control data for communications with external devices (see Section 3.5).
Each transmission data item has a default value. However (depending on the
purpose and application of data transmission), using default values not only
makes data communications more complicated, but may even preclude them.
This section describes the settings of all items in the buffer memory special
applications area, shows how t o make changes, and gives specific examples.
Section 8.14 discusses the special applications area used with the on-demand
function of the dedicated protocol.
(1) This section only applies to changing preset default values. It does
not cover data communications using these default values.
(2) When changing a setting (except for the error LED display area and
the error LED turn-OFF request area) first turn the power supply OFF
and back ON or else reset the PC CPU. Change the setting after the
AJ71C24 READY signal (Xn7) is turned ON, as shown below.
Example: How to disable the RS-232C CD terminal check function
Xn7
interlock signal
I +
~ ~ f - 1
TOP
I
-74
H1OB
K1
K 1
(3) Buffer memory addresses 10E and 11 8H to 11 FH are reserved for the
system only. Writing data to these addresses precludes normal opera-
tion of the AJ71 C24.
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