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3 2 TXD, Transmit Data
5 3 RXD, Receive Data
7 4 RTS, Request to Send
9 5 CTS, Clear to Send
11 6 DSR, Data Set Ready
13 7 GND, Ground
14 20 DTR, Data Terminal Ready
15 8 DCD, Data Carrier Ready
18 22 RI, Ring Indicator
J3 Header Pin
Number
DB25 Connector
Pin Number
9-Pin Serial Port (J4) Pin Assignment
J4 Header Pin
Number
DB9 Connector
Pin Number
Signal
25-Pin Serial Port (J3) Pin Assignment
Signal
1 1 DCD, Data Carrier Detect
2 6 DSR, Data Set Ready
3 2 RXD, Receive Data
4 7 RTS, Request to Send
5 3 TXD, Transmit Data
6 8 CTS, Clear To Send
7 4 DTR, Data Terminal Ready
8 9 RI, Ring Indicator
9 5 GND, Ground
Mainboard Specifications
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