Rs-232C Connector Specifications - Mitsubishi Electric AJ71C24-S6 User Manual

3.
SPECIFICATIONS
MELSEC-A
3.2.2 RS-232C connector specifications
Pin
Signal Direction
Name
A i 0
1
A~~~~
I
ber
Frame
ground
SD (TXD)
Receive
data
RD (RXD)
4
5
6
7
Fig. 3.1 RS-232C Connector Specifications
20
(1) Signals are described below.
(a) FG signal
Request to send
Clear to send
Data set
ready
Signal ground
Connect the cable shield t o pin 1 of the AJ71C24.
If both the
computer and the AJ71C24 have an FG pin, connect the cable
shield to one of the FG pins only.
RS (RTS)
CS (CTS)
DSR (DR)
SG
Receive carrier
detection
Data terminal
ready
If the cable shield is connected t o both FG pins, the resulting noise
may prevent correct data communications.
CD
DTR (ER)
(b) RS signal
The AJ71 C24 system turns ONIOFF the RS signal according to the
setting of the GD terminal check (see Section 7.1) and the transmis-
sion method (see Section 7.2), as shown below.
Data transmission from the external device should be done confirrn-
ing the RS signal controlled by the AJ71C24.
Transmi'-
'lo'
Method
Full-duplex
Half-duplex
CD
terminal
Check Setting
Enabled
Disabled
Enabled
(always set to
enabled)
State
of
CD
Signal
ON
OFF
ON
OFF
ON
OFF
RS Signal ONIOFF Control
When
the AJ71C24 is in the ready
state,
the
AJ71C24 system turns RS
signal ON.
The AJ71C24 system
turns
the RS signal
OFF.
When the AJ71C24 is in the ready state. the
AJ71 C24 system turns the RS signal
ON.
(nor-
mally ON)
See Section 5.