Mitsubishi Electric AJ71C24-S6 User Manual page 43

3.
SPECIFICATIONS
MELSEC-A
(c) CS signal
Data is only transmitted from the AJ71C24 when this signal is ON.
(d) DSR signal
Data is only transmitted from the AJ71C24 when this signal is ON.
(e) CD signal
The AJ71C24 operates accordinq to the setting of the CD terminal
- -
check.
Fuil-
duplex
CD Terminal Check Enabled
The AJ71 C24 performs transmission
processing when the CD signal
(receive carrier detection) is ON.
The transmission sequence of the
AJ71C24 is initialized when the CD
signal is turned OFF during data
communications in the dedicated
Protocol.
CD Terminal Check Disabled
The AJ71C24 performs transmission
processing regardless of the
ONIOFF state of the CD signal. (This
enables data communications with
those external devices which cannot
control (ONIOFF) the CD signal.)
The AJ71C24 system controls the DTR signal as follows:
Half-
duplex
See Section 5.
The AJ71C24 system turns ON the DTR signal when communica-
tions is enabled if the dedicated protocol is currently used.
Setting impossible
The AJ71 C24 system turns ONIOFF the DTR signal according to the
size of available area of the receive data storage OS area during
communications in the no-protocol mode. (The DTR signal turns
ON when the data communications of the AJ71C24 is enabled.)
(f) DTR signal
Appendix 4 gives for the ONIOFF timing of the DTR signal when
using the no-protocol mode.
Since the received data is stored i n the OS area when the DTR
signal is OFF, read the received data using the sequence program
(See Section 9).
(2) ONIOFF definitions are as follows:
ON : 5V t o 1 5 VDC
OFF: - 5 V t o - 1 5 V D C
(3) Interface connector
The following type of RS-232C connector is used. Use a matching
connector.
25-pin D-sub (female) screw-fixing type