IBT Technologies IB791 User Manual page 22

INSTALLATIONS
J7: Serial Ports
J7A (COM1), J4B (COM2), J4C (COM3) and J4D (COM4) are the
onboard serial ports.
Pin #
1
2
3
4
5
6
7
8
9
10
COM2 is jumper selectable for RS-232, RS-422 and RS-485.
Pin #
1
2
3
4
5
6
7
8
9
10
J9, J11: USB Connectors
These two USB headers supports a total of four USB ports (1.1/2.0).
18
Signal Name (RS-232)
DCD, Data carrier detect
RXD, Receive data
TXD, Transmit data
DTR, Data terminal ready
Ground
DSR, Data set ready
RTS, Request to send
CTS, Clear to send
RI, Ring indicator
No Connect.
Signal Name
RS-232
DCD
RX
TX
DTR
Ground
DSR
RTS
CTS
RI
NC
Pin # Signal Name
1 5 Vcc
2 6 USB-
3 7 USB+
4 8 Ground
IB791 User' s Manual
R2-422 RS-485
TX- DATA-
TX+ DATA+
RX+ NC
RX- NC
Ground Ground
RTS- NC
RTS+ NC
CTS+ NC
CTS- NC
NC NC