MITX-CFL0 Series - User Guide, Rev. 1.1
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6.5.
Serial COM 5 & COM 6 Ports (COME & COMF)
The external I/O connector panel supports one dual DB-9 RS232/422/485 COM male ports.
Figure 12: Serial COM 5 & COM 6 Ports COME, COMF
Table 16: Pin Assignment COM 5 & COM 6 Ports COME, COMF
Pin
RS232 Signal
RS422 Signal
Half Duplex
RS485 Signal
Full Duplex
RS485 Signal
Note
1
DCD
TX-
DATA-
TX-
2
RXD
RX+
N/A
RX+
3
TXD
TX+
DATA+
TX+
4
DTR
RX-
N/A
RX-
5
GND
GND
GND
GND
6
DSR
N/A
N/A
N/A
7
RTS
N/A
N/A
N/A
8
CTS
N/A
N/A
N/A
9
RI*
N/A
N/A
N/A
*: Pin configuration can be selected by Jumper COME_PW (for COM 5) and COMF_PW (for
COM 6).
RS232, RS422 and RS485 can be selected in BIOS setup.
Table 17: Signal Description
Signal
Description
TXD
Transmitted Data, sends data to the communications link. The signal is set to the marking
state (-12 V) on hardware reset when the transmitter is empty or when loop mode
operation is initiated.
RXD
Received Data, receives data from the communications link.
DTR
Data Terminal Ready, indicates to the modem etc. that the on-board UART is ready to
establish communication link.
DSR
Data Set Ready, indicates that the modem etc. is ready to establish a communications link.
RTS
Request To Send, indicates to the modem etc. that the on-board UART is ready to
exchange data.
CTS
Clear To Send, indicates that the modem or data set is ready to exchange data.
DCD
Data Carrier Detect, indicates that the modem or data set has detected the data carrier.
