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cPCI-MXS64 Technical Reference Manual
2.9. SERIAL PORTS
Four full function serial ports are provided on the board for asynchronous serial
communications. They are 16C550 high-speed UART compatible and support 16-byte FIFO
buffers for transfer rates from 50bps to 115Kbps.
Each serial port is specified as follows:
Designation
Communication Mode
Serial Port 1
RS-232
Serial Port 2
RS-232
Serial Port 3
RS-232, RS-422, RS-485
Serial Port 4
RS-232
Serial Port 3
Infrared
UART registers are individually addressable and fully programmable.
2.9.1 SERIAL PORT 1
Serial Port 1 is buffered directly for RS-232 operation. Signals include the complete signal set
for handshaking, modem control, interrupt generation, and data transfer. When assigned as
Serial Port 1, the port is 100% compatible with the IBM-AT serial port in RS-232 mode.
Signal Path
Serial Port 1
signal path depends on the output configuration you have ordered for the
board
Related Jumpers
W5 – Remote reset on Serial Port 1 or Serial Port 2 or disabled
BIOS Settings
Section 4.1.11 Integrated Peripherals : Enable/Disable Onboard FDC Controller;
2.9.1.1.
Remote Reset
A remote hardware reset of the cPCI-MXS64 is possible by sending a break on the Serial Port
1 or Serial Port 2 (see Section 3.1 for Remote Reset jumper setting). A break is simple an
abnormally long start bit (100ms or more) on the incoming data line. A break signal is
embedded in the data, so no special wire is required.
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Output Path
Front Plate DB-9, cPCI J5
cPCI J5
cPCI J3
cPCI J3
cPCI-J3
Select Com Port Address of Serial Port 1
2-8
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