IKARPC-W10A-BT In-vehicle Panel PC
Page 92
NOTE:
The following discussion applies to DOS. Contact IEI support or visit the IEI
website for drivers for other operating systems.
The Watchdog Timer is a hardware-based timer that attempts to restart the system when it
stops working. The system may stop working because of external EMI or software bugs.
The Watchdog Timer ensures that standalone systems like ATMs will automatically
attempt to restart in the case of system problems.
A BIOS function call (INT 15H) is used to control the Watchdog Timer.
INT 15H:
AH – 6FH Sub-function:
AL – 2:
Sets the Watchdog Timer’s period.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table C-1: AH-6FH Sub-function
Call sub-function 2 to set the time-out period of Watchdog Timer first. If the time-out value
is not zero, the Watchdog Timer starts counting down. When the timer value reaches zero,
the system resets. To ensure that this reset condition does not occur, calling sub-function
2 must periodically refresh the Watchdog Timer. However, the watchdog timer is disabled
if the time-out value is set to zero.
A tolerance of at least 10% must be maintained to avoid unknown routines within the
operating system (DOS), such as disk I/O that can be very time-consuming.
Summary of Contents for IKARPC-W10A-BT
Page 10: ......
Page 11: ...IKARPC W10A BT In vehicle Panel PC Page 1 Chapter 1 1 Introduction...
Page 21: ...IKARPC W10A BT In vehicle Panel PC Page 11 Chapter 2 2 Unpacking...
Page 26: ...IKARPC W10A BT In vehicle Panel PC Page 16 Chapter 3 3 Installation...
Page 39: ...IKARPC W10A BT In vehicle Panel PC Page 29 Chapter 4 4 Software Installation...
Page 45: ...IKARPC W10A BT In vehicle Panel PC Page 35 Chapter 5 5 BIOS...
Page 76: ...IKARPC W10A BT In vehicle Panel PC Page 66 Chapter 6 6 Interface Connectors...
Page 87: ...IKARPC W10A BT In vehicle Panel PC Page 77 Appendix A A Regulatory Compliance...
Page 92: ...IKARPC W10A BT In vehicle Panel PC Page 82 Appendix B B OBD II Reader Command...
Page 101: ...IKARPC W10A BT In vehicle Panel PC Page 91 Appendix C C Watchdog Timer...
Page 104: ...IKARPC W10A BT In vehicle Panel PC Page 94 Appendix D D Hazardous Materials Disclosure...
