tBOX324-894-FL Series U
ser’s Manual
Connector
13
The COM3~COM4 port connector is a 2x5 terminal block connector.The pin assignment of
RS-232/RS-422/RS-485 is listed on the following table. If you need COM port to support RS-
422 or RS-485, please set it up in BIOS settings.
Pin
RS-232
RS-422
RS-485
1
DCD, Data carrier detect
TX-
Data-
2
RXD, Receive data
TX+
Data+
3
TXD, Transmit data
RX+
NC
4
DTR, Data terminal ready
RX-
NC
5
GND, ground
GND, ground
GND, ground
6
DSR, Data set ready
NC
NC
7
RTS, Request to send
NC
NC
8
CTS, Clear to send
NC
NC
9
RI, Ring indicator
NC
NC
10
NC
NC
NC
Pin Signal USB Port 0
Pin
Signal USB Port 1
1
USB_VCC (+5V level
standby power)
10
USB_VCC (+5V level
standby power)
2
USB_Data2-
11
USB_Data3-
3
US
12
US
4
GND
13
GND
5
SSRX2-
14
SSRX3-
6
SSRX2+
15
SSRX3+
7
GND
16
GND
8
SSTX2-
17
SSTX3-
9
SSTX2+
18
SSTX3+
