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3.10 Serial Ports
The serial ports are located on two IDC10 headers "COM1" and "COM2". Adapter cables with
standard DSUB-9 male connectors are available. The ports either work in RS232 or RS485 mode,
selectable in BIOS. When entering Motherboard Device Configuration
Device Configurations, COM Port 1 Mode and COM Port 2 Mode can be selected. Termination
resistors for RS485 Mode can be set with Jumpers on pin headers as described in this chapter.
To enable transmitters of COM1 and COM2 in RS485 Mode set RTS signal to '1'.
The third serial Port is located at the supervisory connector see chapter 3.18.
COM Port 3 is a RS485-only interface and can be used in 2-wire and in 4-wire systems. In 2-wire
systems only Half Duplex is possible, whereas in 4-wire systems both, Half- and Full-Duplex, mode
can be used. In 2-wire systems or 4-wire systems with more than 1 transmitter the transmitter must
be disabled in receive mode, and enabled in transmit mode. See chapter 4.3 for an example.
The serial ports are programmable in BIOS setup. When entering Motherboard Device
Configuration
accessible.
The following settings are possible for COM1 and COM2:
•
Disabled
•
3F8 / IRQ4 (base address / interrupt channel)
•
2F8 / IRQ3 (base address / interrupt channel)
•
3E8 / IRQ4 (base address / interrupt channel)
•
2E8 / IRQ3 (base address / interrupt channel)
The following for COM3:
base address
•
Disabled
•
3F8
•
2F8
•
3E8
•
2E8
interrupt channel
•
IRQ5
•
IRQ6
•
IRQ7
•
IRQ9
•
IRQ10
•
IRQ11
•
IRQ15
TME-104-CLR-LX800-R1V3.doc
Serial and Parallel Device Configurations, configuration of the serial ports is
Rev. 1.3
Serial and Parallel
24(53)
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