KBox A-203-sXAL4 – User Guide Preliminary Rev. 0.2
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10.1.5.
(X102) Serial Interface COM 1 (RS232/485/422)
Table 11: (X102) Serial Interface COM 1 (RS232)
*Once configured to RS485 in BIOS, COM1 can work as 485 or 422
This port provides no internal termination in RS485/422 mode. If necessary, it has
to be terminated externally
.
10.1.6.
(X202) Serial Interface COM 2 (RS232)
Table 12: (X202) Serial Interface COM 2 (RS232)
Pin
Signal Name
9-pin D-SUB Connector (male)
1
NC
2
RXD
(Receive Data)
3
TXD
(Transmit Data)
4
NC
5
GND
(Signal Ground)
6
NC
7
NC
8
NC
9
NC
Pin
RS232
RS485/422* Full Duplex
RS485/422* Half Duplex
1
2
RXD
(Receive Data)
RX+
3
TXD
(Transmit Data)
TX-
Data-
4
5
Ground
6
7
RTS
(Request to Send)
TX+
Data+
8
CTS
(Clear to Send)
RX-
9
