User`s manual

7
(1) Example of connection to an external device which can turn on/off the CD
signal (pin No. 1)
The module External device
Signal
name
Pin number
Cable connection and signal direction
(Connection example of full or 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) Example of connection to an external device which cannot turn on/off the
CD signal (pin No. 1)
(a) Example of connection for DC code control or DTR/DSR control
The module External device
Signal
name
Pin number
Cable connection and signal direction
(Connection example of 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
(b) Example of connection for DC code control
The module External device
Signal
name
Pin number
Cable connection and signal direction
(Connection example of 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