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MELSEC-Q
2. SYSTEM CONFIGURATION
(c) Connection to Q corresponding serial communication module
The specifications of the RS-232 cable connector are indicated below.
Pin
Number
Signal Code Signal Name
Signal Direction
Q corresponding serial communication module
external device
1 CD Receive carrier detection
2 RD(RXD) Receive data
3 SD(TXD) Send data
4 DTR(ER) Data terminal ready
5 SG Send ground
6 DSR(DR) Data set ready
7 RS(RTS) Request to send
8 CS(CTS) Clear to send
9 RI(CI) Call indication
• Connection example which can turn ON/OFF CD signal (No. 1 pin)
Signal code
Pin number
CD
1
2
3
4
5
6
7
8
9
Other End Device Side
Signal code
CD
RD(RXD)
SD(TXD)
DTR(ER)
SG
DSR(DR)
RS(RTS)
CS(CTS)
QJ71C24(-R2) Side
RD(RXD)
SD(TXD)
DTR(ER)
SG
DSR(DR)
RS(RTS)
CS(CTS)
RI(CI)
• Connection example which cannot turn ON/OFF CD signal (No. 1 pin)
Connection example for exercising DC code control or DTR/DSR control
Other End Device Side
Signal code
CD
RD(RXD)
SD(TXD)
DTR(ER)
SG
DSR(DR)
RS(RTS)
CS(CTS)
Signal code
Pin number
CD
1
2
3
4
5
6
7
8
9
QJ71C24(-R2) Side
RD(RXD)
SD(TXD)
DTR(ER)
SG
DSR(DR)
RS(RTS)
CS(CTS)
RI(CI)