Psion Teklogix Vehicle-Mount Computer 8590 User Manual

7.1  Serial Ports

By default the 8580/8590 is equipped with 4 serial ports. COM1 and COM2 are 
accessible from the outside. COM3 and COM4 are used internally for 
communication with the environment controller and the touch controller.

7.1.1  Resources

Resources for the serial ports are pre-defined in the system architecture and 
automatically managed by the BIOS. The resources for COM1, COM2, COM3 and 
COM4 can be defined via the BIOS.
The standard resources for serial ports are:

7.1.2  COM1 Options

The following section describes what needs to be observed when using the COM1 
port to supply power to external equipment.
The resources required for the COM1 controller module are automatically reserved 
by the BIOS.

7.1.3  COM1 As A Power Supply

The COM1 port can optionally supply externally connected equipment with +12 V 
or +5 V of power. The voltages are protected by internal fuses which limit the total 
consumed current to 1.1 A at 5 V (including keyboard and mouse). The current 
consumption at 12 V is also limited to 1.1 A by a reversible fuse. Depending on the 
specific system configuration, the maximum current consumption at +12 V may be 
significantly lower.

7.1.4  Serial Port Printers

Printers with a serial port can be connected to the 8580/8590.

7.1.5  Serial Port Bar Code Scanners

To activate the integrated scanner software wedge under Windows XP Embedded:

COM1

Address 0x3F8 - 0x3FF (hexadecimal), Interrupt IRQ4

COM2

Address 0x2F8 - 0x2FF (hexadecimal), Interrupt IRQ3

COM3

Address 0x3E8 - 0x3EF (hexadecimal), Interrupt IRQ10

COM4

Address 0x2E8 - 0x2EF (hexadecimal), Interrupt IRQ11