EPM-19 Hardware Reference Manual
31
Serial Ports
The EPM-19 includes four on-board 16550-based serial channels located at standard PC I/O
addresses. Each COM port can be independently enabled or disabled in BIOS Setup.
All four COM ports by default are set to RS-232 mode
COM1 and COM2 are RS-232 (up to 115.2K baud) serial ports. There are no hardware
configuration jumpers for COM1 and COM2 because they only operate in RS-232 mode.
IRQ lines are chosen in the BIOS Setup utility.
COM3 and COM4 can be operated in RS-232 or RS-422/485 mode. IRQ lines are chosen in
the BIOS Setup utility.
Additional non-standard baud rates are also available through the BIOS Setup utility.
Serial Port Connectors
Figure 19 shows the location and pin orientation of the serial port connectors.
Figure 19. Location and Pin Orientation of Serial Port Connectors
6