Dell PowerEdge 1800 - Manual (Page 146)

146
I/O Ports and Connectors
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Table B-1 shows the icons used to label the connectors on the system.
Serial Connector
Serial connectors support devices such as external modems, printers, and mice that require serial
data transmission. The serial connector uses a 9-pin D-subminiature connector.
Serial Connector Autoconfiguration
The default designation of the integrated serial connector is COM1. When you add an expansion
card containing a serial connector that has the same designation as the integrated connector, the
system’s autoconfiguration feature remaps (reassigns) the integrated serial connector to the next
available designation. Both the new and the remapped COM connectors share the same IRQ
setting. COM1 and COM3 share IRQ4, while COM2 and COM4 share IRQ3.
NOTE:
If two COM connectors share an IRQ setting, you may not be able to use them both at the same
time. In addition, if you install one or more expansion cards with serial connectors designated as COM1
and COM3, the integrated serial connector is disabled.
Before adding a card that remaps the COM connectors, check the documentation that came with
the software to make sure that the software can accommodate the new COM connector
designation.
Figure B-2 illustrates the pin numbers for the serial connector and Table B-2 defines the pin
assignments for the connector.
Table B-1. I/O Connector Icons
Icon Connector
Serial connector
Parallel connector
Mouse connector
Keyboard connector
Video connector
USB connector
NIC connector