MITX-DNV0 Series - User Guide, Rev. 1.2
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7.6. Serial COM2 Ports (CN16)
Figure 16: Serial COM CN16
Table 30: Pin Assignment CN16
Pin RS232 Signal RS422 Signal Half Duplex
RS485 Signal
Full Duplex
RS485 Signal
Note
1 DCD TX- DATA- TX-
2 DSR - - -
3 RXD TX+ DATA+ TX+
4 RTS - - -
5 TXD RX+ - RX+
6 CTS - - -
7 DTR RX- - RX-
8 RI - - -
9 GND GND GND GND
10 +5V +5V +5V +5V
The COM ports need to install an OS patch from ITE. The patch is only available for
Windows and is not available Linux.
Table 31: 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.
RI Ring Indicator, indicates that the modem has received a ringing signal from the telephone line.
TX+/- Transmitted Data differential pair sends data to the communications link.
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