Fortec Star iBASE IB836 Series Manual page 34

2.5.7 Battery Connector (J19)
Pin Assignment
1 Battery+
2 Ground
2.5.8 COM2, COM3, COM4 RS-232 Ports (J24, J21, J17)
Pin Assignment
1 DCD, Data carrier detect
3 TXD, Transmit data
5 Ground
7 RTS, Request to send
9 RI, Ring indicator
24
Pin Assignment
2 RXD, Receive data
4 DTR, Data terminal ready
6 DSR, Data set ready
8 CTS, Clear to send
10 Not Used
IB836 User's Manual