Kontron MSM-LP Manual User Guide V106 - Manual (Page 16)

MSM-LP / MSM-LP Connectors & Jumpers
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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)