KONTRON
Serial Communication Interfaces
26
CMP/P3 and CMP/C3 User’s Guide
14.
SERIAL-COMMUNICATION INTERFACES
14.1
Serial Ports COMA-D
Four fully functional serial ports (COMA, COMB, COMC, and COMD) provide asynchronous serial
communications. The serial ports support RS-232 operation modes and are compatible with the
serial-port implementation used on the IBM Serial Adapter. You also can use COM D (Connector
X18) for RS-485 purposes and COM B for IrDA connectivity. The ports are 16550 high-speed UART
compatible and support 16-byte FIFO buffers for transfer rates up to 115.2Kbaud.
14.2
RS-232 Connectors
COM A is available through the X14 connector (10 pins) and COM B through the X15 connector (10
pins). COM C is available through the X16 connector (10 pins) and COM D through either the X17
connector (10 pins) for RS-232 or the X18 connector for RS-485. If COM B is configured for IrDA
modes, use connector X2.
To have the signals available on the standard serial interface connectors DSUB9 or DSUB25, 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 COM A, COM B, COM C, and COM D (all RS-232) as well as
necessary connections for the DSUB adapters.
Header
Pin
Signal Name
Function
In / Out
DSUB-25
DSUB-9
1
DCD1/2/3/4
Data Carrier Detect
In
8
1
2
DSR1/2/3/4
Data Set Ready
In
6
6
3
SIN1/2/3/4
Receive Data
In
3
2
4
RTS1/2/3/4
Request to Send
Out
4
7
5
SOUT1/2/3/4
Transmit Data
Out
2
3
6
CTS1/2/3/4
Clear to Send
In
5
8
7
DTR1/2/3/4
Data Terminal Ready
Out
20
4
8
RI1/2/3/4
Ring Indicator
In
22
9
9
GND
Signal Ground
--
7
5
1
9
2
10
10
VCC (*)
+5V
--
--
--
Note
:
(*)
To protect external power lines of peripheral devices, make sure that
-- the wires have the right diameter to withstand maximum available current
-- the enclosure of the peripheral device fulfils fire-protection requirements
-- of IEC/EN 60950.
To find the location of the serial ports on the board, please see the Appendix E: Connector Layout
chapter.
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