User`s guide

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9-Pin Serial Port (J2) Pin Assignment
25-Pin Serial Port (J3) Pin Assignment
4 - DTR, Data Terminal
Ready
3 - TXD, Transmit Data
2 - RXD, Receive Data
1 - DCD, Data Carrier Detect
5 - GND, Ground
9 - RI, Ring Indicator
8 - CTS, Clear To Send
6 - DSR, Data Set Ready
7 - RTS, Request to Send
22 - RI, Ring Indicator
20 - DTR, Data Terminal Ready
8 - DCD, Data Carrier Ready
7 - GND, Ground
6 - DSR, Data Set Ready
5 - CTS, Clear to Send
4 - RTS, Request to Send
3 - RXD, Receive Data
2 - TXD, Transmit Data
Chapter 5 - Mainboard Specifications