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Kontron
SERIAL-COMMUNICATION INTERFACE
8.
Two fully functional serial ports (COMA and COMB) 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. They are 16550 high-speed
UART compatible and support 16-byte FIFO buffers for transfer rates from 50baud to
115.2Kbaud.
Connector
8.1
COMA is available through the X10 connector (10 pins) and COMB through the X13
connector (10 pins). 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 COMA and COMB as well as necessary connections
for the DSUB adapters.
Header
Pin
Signal Name
1
2
3
4
5
6
7
1
2
8
9
10
9
10
To find the location of the serial ports on the MOPS/386A board, please see the Appendix E:
Connector Layout chapter.
Configuration
8.2
You can set the two serial input/output interfaces to base I/O-address 3F8h, 2F8h, 3E8h,
2E8h, AUTO or disabled. You can set their interrupts to IRQ3 or IRQ4. All these settings are
changeable from the MOPS/386A BIOS menu. Refer to the I/O Device Configuration
submenu in the Appendix B: BIOS Operation chapter for information on configuration.
MOPS/386A User's Guide
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
VCC
+5V
15
In / Out
DSUB-25
In
8
In
6
In
3
Out
4
Out
2
In
5
Out
20
In
22
--
7
--
--
Serial-Communication Interface
DSUB-9
1
6
2
7
3
8
4
9
5
--
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