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Chapter 10
10. Serial-Port Interfaces
Two fully functional serial ports (COMA and COMB) provide asynchronous serial communications. COMA and
COMB support RS-232 operation modes. They are 16550 high-speed UART compatible and support 16-byte
FIFO buffers for transfer rates from 50 Baud to 115.2 KBaud.
10.1 Connector
COMA is available through the X15000 connector (10 pins) and COMB through the X15001 connector (10
pins). To have the signals available on the standard serial interface connectors DSUB-9 or DSUB-25, an
adapter cable is required.
A 9-pin DSUB cable is available from Kontron (KAB-DSUB9-2, Part Number 96017-0000-00-0). The
following table shows the pinouts for COMA and COMB, as well as necessary connections for DSUB adapters.
Header
Pin
1
2
3
4
5
6
7
8
9
10
Note:
To protect the external power lines of peripheral devices, make sure that
1
- the wires have the right diameter to withstand the maximum available current.
- to enclosure of the peripheral device fulfills the fire-protecting conditions of IEC/EN 60950.
To find the location of the serial ports on the MOPSlcdLX board, please see the Appendix "Connector Lay-
out".
Kontron User's Guide MOPSlcdLX
Signal Name
Function
/DCD
Data Carrier Detect
/DSR
Data Set Ready
RxD
Receive Data
/RTS
Request to Send
TxD
Transmit Data
/CTS
Clear to Send
/DTR
Data Terminal Ready
/RI
Ring Indicator
GND
Signal Ground
(1)
+5V
VCC
20
Serial-Port Interfaces
In/Out
DSUB-25
DSUB-9
In
8
In
6
In
3
Out
4
Out
2
In
5
Out
20
In
22
--
7
--
--
1
6
2
7
3
8
4
9
5
--
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