Mitsubishi Electronics AJ65bt-r2 ユーザーズマニュアル

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MELSEC-A

3 SPECIFICATIONS

3.3 RS-232-C interface specifications

The specifications of the RS-232-C interface for connection with an external device are
shown below.

No.

Name

Signal

abbrev.

Signal direction

R2 external

device

Reception carrier
detection

2 Reception data

RD(RXD)

3 Transmission data

SD(TXD)

4 Data terminal ready

ER(DTR)

5 Signal ground

6 Data set ready

DR(DSR)

7 Transmission request RS(RTS)
8 Transmission enable

CS(CTS)

9 Not used

–

The details of each signal are explained below.

CD.................. The CD signal status can be read with the input signal RXnB.

ER (DTR)....... When using DTR/DSR control, this is turned ON and OFF according

to the empty size of the OS reception area for storing the received
data.
(The DTR signal turns ON when the RS can receive data.)
When not using DTR/DSR control, the output signal RYnA is followed.

DR (DSR) ...... When using DTR/DSR control, if this is OFF, data will not be

transmitted from R2 to the external device.
Set this to be always ON when the external device is in the reception
enabled state.
When not using DTR/DSR control, the DSR signal status will be
ignored.

RS .................. This follows the

R 2

101

setting and output signal RYn9.

CS .................. When the CS signal is OFF, data will not be transmitted from R2 to

the external device.
Set this to be always ON when the external device is in the reception
enabled state.

A standard connection example of the RS-232-C cable is given in section 4.5.2.

The following type of connector
is mounted on the R2 side, so
use a mate connector that
matches this type.
9-pin D-SUB (female) screw-
fixed type

DDK Ltd.

17L-10090-27-D9AC