User manual

Chapter 7: Serial Ports
Serial Ports
8580/8590 Vehicle-Mount Computer User Manual 105
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 envi-
ronment 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
ThIS section outlines guidelines that should 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. A label is applied near the port identifying the voltage if so configured. The volt-
ages 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.
Warning: Please refer to “Vehicle Applications (such as Forklifts)” on page 46 for
information regarding isolation of external devices.
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
Note: Keep in mind that pin 9 can be configured to provide +5 V or +12 V power to an
external device. This option must be specified at ordering time.