TREK-775/TREK-776 User Manual
36
4.4 COM-port Interface
The computer provides four serial ports: COM1, COM 2: RS-232/422/
485 (selectable via BIOS setting) and COM3, COM 4: RS-232.
The IRQ and the address ranges for COM1, COM2, COM3 and COM4
are fixed.
However, if it becomes necessary to disable the port or change these
parameters later, it is possible to do so through the system BIOS setup.
The table overleaf shows the default settings for the computer's serial
ports.
COM1 and COM2 are linked as one set. It is possible to exchange the
address range and interrupt IRQ of COM1 for the address range and inter-
rupt IRQ of COM2. After exchanging:
COM1's address range is 2F8 ~ 2FF and its IRQ is IRQ3.
COM2's address range is 3F8 ~ 3FF and its IRQ is IRQ4.
COM3 and COM4 are linked as another set. It is possible to exchange the
address range and interrupt IRQ of COM3 for the address range and inter-
rupt IRQ of COM4. After exchanging:
COM3's address range is 3E8 ~ 3EF and its IRQ is IRQ10.
COM4's address range is 2E8 ~ 2EF and its IRQ is IRQ5.
Table 4.7: Serial port default settings
Port
Address Range
Interrupt
COM1
3F8 ~ 3FF
IRQ4
COM2
2F8 ~ 2FF
IRQ3
COM3
3E8 ~ 3EF
IRQ10
COM4
2E8 ~ 2EF
IRQ 5
Содержание TREK-775
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Страница 23: ...7 Chapter1 1 4 Dimensions All dimensions are in millimeters Figure 1 1 TREK 775 Figure 1 2 TREK 776...
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Страница 71: ...Appendix A Pin Assignments This appendix contains information on TREK 775 TREK 776 s pin assign ments...
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