1.
GENERAL
DESCRIPTION
MELSEC-A
1.1.4
Mode
switching
function
After the AJ71 C24 has started operating, the AJ71 C24's RS-232C/RS422
interfaces can be switched to another mode.
bprotocd
mode
Ween
formats
1
to
4
Bidirectional
mode
1.1.5
Transmission
control
function
Data communications between the AJ71 C24 and an external device can be
controlled by using DC codes
or
DTR/DSR signals.
(1) Control using DCl/DC3 or DC2/DC4 codes
*This function can be used for controlling data communications with
an external device connected to the AJ71 C24 at the RS-232C/RS-422
interface.
e
DCl/DC3 control refers to using the DC1 and DC3 codes to notify the
communicating device
of
the enabled/disabled state of data receive.
e
DC2/DC4 control refers to using DC2 and DC4 codes to indicate the
valid range
of
sendheceive data.
e
Data to be sent/received must begin with DC2 code and end with DC4
code.
r
IDc2
Data
Dc4
c
I
il
4
(2) Control using DTR/DSR signals
c
*This function can be used for data communications with an external
device connected to the AJ71 C24 at the RS-232C interface.
eDTR/DSR control refers to using the DTR and DSR signals to notify
the communicating device
of
the enabled/disabled state
of
data
receive
of
the AJ71 C24 or external device.
*The AJ71 C24 controls the DTR signal as follows:
When data can be received: Turns
ON
the DTR signal.
When data cannot be received: Turns
OFF
the DTR signal.
*The AJ71 C24 controls the DSR signal as follows:
When the DSR signal is
ON:
Sends when send data exists.
When the DSR signal is
OFF:
Sends only
if
the DSR is
ON
when send
data exists.
1-10
L
L
L
x
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