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System I/O
Ethernet
Poseidon includes a 10/100/1000 BaseT (Gigabit) Ethernet connectivity, using an Intel 82541 Gigabit Ethernet
controller. The signals are provided on two connectors on the right edge of the board:
Jumper Block
Connector Type
J10
RJ45
J11
6-pin header
Serial Ports
Poseidon contains four serial ports. Each port is capable of transmitting at speeds up to 115.2Kbaud. Ports COM1
and COM2 are built into the standard chipset., which are standard 16550 UARTs with 16-byte FIFOs.
Ports COM3 and COM4 are derived from an Exar 16C2850 dual UART chip and include 128-byte FIFOs. These
ports may be operated at speeds to 1.5Mbaud with installation of high-speed drivers, as a custom option.
The serial ports use the following default system resources.
Port
I/O Address Range
IRQ
COM1
0x3F8 - 0x3FF
4
COM2
0x2F8 - 0x2FF
3
COM3
0x3E8 - 0x3EF
7
COM4
0x2E8 - 0x2EF
10
The COM1 and COM2 settings may be changed in the system BIOS. Select the
Advanced
menu, followed by
I/O
Device Configuration,
to modify the base address and interrupt level.
The settings of COM3 and COM4 I/O addresses may be changed using jumpers J5. The jumper settings are auto-
detected by the BIOS.
Note: The IRQ settings for COM3 and COM4 are selected using jumper J4. COM3 may use IRQ4,
IRQ7 or IRQ10. COM4 may use IRQ3, IRQ7 or IRQ10. Once these jumper selections are made, you
must update the serial port IRQ settings in the BIOS and device driver to match these selections; the
IRQ settings are NOT auto-detected in the way that the address settings are detected.
RS-232 Mode
RS-232 mode is the standard mode for most PC applications. COM1 and COM2 are always RS-232-only. COM3
and COM4 are RS-232 by default and the settings are managed in the BIOS using the
I/O Device Configuration
menu.
RS-232 mode for all four ports provides complete signaling support, including all handshaking signals and the Ring
Indicate (RI) signal.
RS-485 Mode
COM3 and COM4 are independently selectable between RS-232 mode (default) and RS-485 mode. If RS-485 mode
is selected, special consideration is required to implement RS-485 mode in both hardware and software.
Diamond Systems Corporation
Poseidon User Manual
Page 48