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MELSEC-
A
8 OTHER FUNCTIONS
(b) When using the dedicated command with the QCPU (Q mode)
/ QnACPU
Registration execution
Write "0" in to
register (default value is "4")
Set EEPROM function
request (RYn7)
Reset EEPROM function
request (RYn7)
R2 1C0
H
8.9 Controlling the RS-232-C signal
The status of the RS-232-C interface signals stored in the R2 buffer memory can be
read and the output controlled.
This is carried out with the remote input/remote output (RX/RY).
8.9.1 Correspondence of RS-232-C control signal and remote input/output signal
The correspondence of the RS-232-C interface control signals and the remote
input/output signals (RX/RY) is shown below.
Remote input/output
signal
RS-232-C control
signal
Details
RXn9 CS (CTS) signal
RXnA DR (DSR) signalInput signal
RXnB CD signal
The ON/OFF state of the input control signal
is reflected on the corresponding remote input
signal (RXn9 to RXnB).
RYn9 RS (RTS) signal
Output signal
RYnA ER (DTR) signal
The ON/OFF state of the remote output signal
is reflected on the corresponding control
signal output.
The area between the RS-232-C control signal and input/output signal (RX/RY) is
updated every 100ms.
Refer to section 3.3 for details on each RS-232-C signal.