User manual

27 TREK-743 User Manual
Chapter 4 Jumper Settings and Connectors
4.4 COM Port Interface
The computer provides two external serial ports: COM1, COM 2: RS-232/422/485
(selectable via BIOS setting), and four internal ports: COM3 to COM6 for touch-
screen, GSM/GPRS, GPS and CAN BUS respectively. The IRQ and the address
ranges for COM1 to COM6 are fixed.
However, if it is necessary to disable a port or change parameters later, it is possible
to do so in the system BIOS setup. The table overleaf shows the default settings for
the serial ports on the computer.
COM1 and COM2 comprise one set. It is possible to exchange the address range
and interrupt IRQ of COM1 for the address range and interrupt IRQ of COM2. After
exchanging:
COM1's address range is 3F8 ~ 3FF and its IRQ is IRQ4.
COM2's address range is 2F8 ~ 2FF and its IRQ is IRQ3.
COM3 and COM4 are another set. It is possible to exchange the address range and
interrupt IRQ of COM3 for the address range and interrupt IRQ of COM4. After
exchanging:
COM3's address range is 3E8 ~ 3EF and its IRQ is IRQ7.
COM4's address range is 2E8 ~ 2EF and its IRQ is IRQ5.
COM5 and COM6 are another set. It is possible to exchange the address range and
interrupt IRQ of COM3 for the address range and interrupt IRQ of COM6. After
exchanging:
COM5's address range is 4F8 ~ 4FF and its IRQ is IRQ6.
COM6's address range is 4E8 ~ 4EF and its IRQ is IRQ10.
Table 4.7: Serial Port Default Settings
Port Address Range Interrupt
COM1 3F8 ~ 3FF 4
COM2 2F8 ~ 2FF 3
COM3 3E8 ~ 3EF 7
COM4 2E8 ~ 2EF 5
COM5 4F8 ~ 4FF 6
COM6 4E8 ~ 4EF 10