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7.9. Serial COM1 - COM2 Ports (CN6 & CN7)
Figure 21: Serial COM CN6, CN7
Table 33: Pin Assignment CN6, CN7
Pin
RS232 Signal
1
DCD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
10
+5V
The COM1 and COM2 serial ports need to install an OS patch from ITE. The patch is only
available for Windows and is not available Linux.
Table 34: 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.
www.kontron.com
RS422 Signal
Half Duplex
RS485 Signal
TX-
DATA-
N/A
N/A
TX+
DATA+
N/A
N/A
RX+
N/A
N/A
N/A
RX-
N/A
N/A
N/A
GND
GND
+5V
+5V
Full Duplex
Note
RS485 Signal
TX-
N/A
TX+
N/A
RX+
N/A
RX-
N/A
GND
+5V
ECX-KBL-U - User Guide, Rev. 1.0
// 41
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