Pin Signal ------------------------------------- 1 DCD Carrier Detect 2 RXD Receive Data 3 TXD Transmit Data 4 DTR Data Term. Ready 5 GND Signal GND 6 DSR Data Set Ready 7 RTS Request to Send 8 CTS Clear to Send 9 RI Ring Indicator
DB-25 Connector
Pin Signal ------------------------------------ 1 GND Ground / Shield 2 TXD Transmit Data 3 RXD Received Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 GND Ground 8 DCD Carrier Detect 9 {Reserved} 10 {Reserved} 11 {Unassigned} 12 {2nd CD} 13 {2nd CTS} 14 {2nd TXD} 15 Transmit Clock 16 {2nd Rec. Clock} 17 {Receive Clock} 18 {Unassigned} 19 {2nd RTS} 20 DTR Data Term Ready 21 {Sig. Quality} 22 RI Ring Indicator 23 {Data Rate Sel.} 24 {Transmit Clock} 25 {Unassigned}