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APP - 24 APP - 24
MELSOFT
A
PPENDICES
Appendix 3.3 Q Series
The connector specifications are indicated below.
Pin No. Signal Code Signal Name
Signal Direction Q series-
compatible C24
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
(1) Connection example which can turn ON/OFF CD signal (No.1 pin)
Q series -compatible C24
Personal Computer
Side
Signal Name Pin No.
Cable Connection and Signal Direction
(Connection example for full duplex/half
duplex communication)
Signal Name
CD 1 CD
RD(RXD) 2 RD(RXD)
SD(TXD) 3 SD(TXD)
DTR(ER) 4 DTR(ER)
SG 5 SG
DSR(DR) 6 DSR(DR)
RS(RTS) 7 RS(RTS)
CS(CTS) 8 CS(CTS)
RI(CI) 9
(2) Connection example which cannot turn ON/OFF CD signal (No.1 pin)
Connection example for exercising DC code control or DTR/DSR control
Q series -compatible C24
Personal Computer
Side
Signal Name Pin No.
Cable Connection and Signal Direction
(Connection example for full duplex
communication)
Signal Name
CD 1 CD
RD(RXD) 2 RD(RXD)
SD(TXD) 3 SD(TXD)
DTR(ER) 4 DTR(ER)
SG 5 SG
DSR(DR) 6 DSR(DR)
RS(RTS) 7 RS(RTS)
CS(CTS) 8 CS(CTS)
RI(CI) 9