Com3 & Com4 Serial Port (J2) - IBASE Technology IB981AF-C226 User Manual

2.5.2 COM3 & COM4 Serial Port (J2)
COM3 (pin1 ~ pin10) and COM4 (pin11 ~ pin20) support RS-232
only.
Pin Assignment
1 DCD3
3 RXD3
5 TXD3
7 DTR3
9 Ground
11 DCD4
13 RXD4
15 TXD4
17 DTR4
19 Ground
IB981 User's Manual
2
Hardware Configuration
1
2
Pin Assignment
2 DSR3
4 RTS3
6 CTS3
8 RI3
10 NC
12 DSR4
14 RTS4
16 CTS4
18 RI4
20 NC
19
20
19