Serial port interfaces – x40/x41/x42/x43 – Kontron MSM-LP Manual User Guide V106 User Manual
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3.2.3 Serial Port Interfaces – X40/X41/X42/X43
Four serial ports for asynchronous serial communication are defined. X40, X41 support RS-232 level and X42, X43
support TTL level. An external conversion to RS-232 and RS-422/485 is possible for all ports.
Note:
External converters to RS-232 or RS-422/485 with galvanic separation are available. All four ports can
bypass the level-shifters to support TTL levels (OEM high volume placement option).
On system board all four serial ports support TTL level!
Header
Pin
Signal Name
Function
DSUB9
2.54mm grid
1
DCDXx#
Data carrier detect
1
2
DSRXx#
Data set ready
6
3
RXDXx#
Receive data
2
4
RTSXx#
Request to send
7
5
TXDXx#
Transmit data
3
6
CTSXx#
Clear to send
8
7
DTRXx#
Data terminal ready 4
8
RIXx#
Ring indicator
9
9
GND
Ground
5
10
V5.0_S0
Power +5V
-
x is the number of the COM port (COM1: x -> 1)