Rs-232-C Interface Specifications - Mitsubishi MELSEC AJ65BT-R2 User Manual

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.
1 2 3 4
6 7 8 9
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
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
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.
5
Pin
Name
No.
Reception carrier
1
detection
2 Reception data
3 Transmission data
4 Data terminal ready
5 Signal ground
6 Data set ready
7 Transmission request RS(RTS)
8 Transmission enable
9 Not used
setting and output signal RYn9.
H
3 - 3
MELSEC-A
Signal direction
Signal
R2 external
abbrev.
device
CD
RD(RXD)
SD(TXD)
ER(DTR)
SG
DR(DSR)
CS(CTS)
– –