5-2
Serial ports
PC-500 user’s manual
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Description of serial ports
Conflicting COM port addresses
The following table lists the COM1 and COM2 addresses that conflict
with those addresses belonging to COM3 through COM6.
Table 5-2
Conflicting COM port addresses
COM1
COM2
COM3
COM4
COM5
220h
220h
228h
228h
238h
238h
2E0h
2E0h
2E8h
2E8h
2E8h*
2F8h
2F8h*
320h*
338h
338h
3E8h
3E8h
3E8h*
3F8h*
3F8h
* = default
COM1
COM1 is either a full 8-wire RS-232 (standard) or an industrial 4-wire
RS-232 (optional) configuration. The default I/O address for COM1 is
3F8h, but can be changed in SETUP to any of the addresses in Table
5-3. Refer to the SETUP programs chapter for more information on
running SETUP. IRQ4 is dedicated to COM1 and if COM1 is not used
under interrupt control, IRQ4 may be used by other resources. For
example, when COM1 is the console, COM1 uses IRQ4. COM1 can be
used for console I/O or RS-232 I/O. COM1 and COM2 share the J13,
20-pin header. See the chapter on IRQ routing and opto IRQs for more
details.
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