Serial Ports; Com1, Com2, Com3 And Com4 Pin Header Connectors - Kontron KTUS15/mITX User Manual

KTD-00774-D
4.10

Serial Ports

Two or four RS232 serial ports are available on the KTUS15 boards depending on the configuration (refer to
section KTUS15/mITX Board configurations).
The typical definition of the signals in the COM ports is as follows:
Signal Description
TxD Transmitted Data, sends serial data to the communications link. The signal is set to the marking
state (-12V) on hardware reset when the transmitter is empty or when loop mode operation is
initiated.
RxD Received Data, receives serial data from the communications link.
Data Terminal Ready, indicates to the modem or data set that the on-board UART is ready to
DTR
establish a communication link.
DSR Data Set Ready, indicates that the modem or data set is ready to establish a communications
link.
RTS Request To Send, indicates to the modem or data set 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.
The connector pinout for each operation mode is defined in the following sections.
4.10.1

COM1, COM2, COM3 and COM4 Pin Header Connectors

The pinout of Serial ports Com1, 2, 3 and 4 is as follows:
Pull
Note
U/D
-
-
-
Note 1: The COM 1, 2, 3 and 4 header 5V supply is fused with individual 1.1A resettable fuses for each
connector.
A DB9 adapter (ribbon cable) is available for connecting the COM ports to I/O front panel.
KTUS15/mITX
Ioh/Iol Type Signal
- I DCD
- I RxD
O TxD
O DTR
- PWR GND
PIN# Signal Type Ioh/Iol
1 2 DSR I
3 4 RTS O
5 6 CTS I
7 8 RI I
9 10 5V PWR
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Pull
Note
U/D
-
-
-
-
- - 1
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