Mitsubishi MELSEC LJ71C24, User Manual

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3 SPECIFICATIONS
( : Applicable protocol)
Function Description MC
Nonproced
ural
protocol
Bidirectional
protocol
Pd Reference
DC code control
(including Xon/Xoff
control)
This control notifies the availability of data
reception in the host station and the
effective range of sent/received data to
external devices, using the data for
transmission control in the C24.
Transmission
control
DTR/DSR control
This control notifies the availability of data
reception in the host station to external
devices, using the ER(DTR)/DR(DSR)
signal of the RS-232 interface.
User's manual
(Application)
Independent operation of each
interface
Two interfaces of the C24 perform data
communication with external devices
without connecting each other.
Section 7.3
Linked operation of each interface
All data received from one of the two
interfaces is transmitted from the other
interface.
Section 7.3.5
Parameter registrations to the flash
ROM
Initial values of the buffer memory can be
changed by setting each parameter and
writing to the flash ROM.
Section 7.4
Remote password check function
Checks the password in the C24 when a
remote user accesses to the LCPU with
the modem function. This function
prevents unauthorized accesses to the
LCPU.
User's manual
(Application)
Enabling or disabling echo back of
the RS-422/485 interface
When data are sent through RS-485 (2-
wire type) from the RS-422/485 interface,
the same data are also sent to RDA or
RDB in the host station. Whether to
receive the returned data or not (discard)
can be specified.
Section 6.3.5