IASO-W10B-N6210 Medical Panel PC
Page 41
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 E-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 IAS0-W10B-N6210
Page 9: ...IASO W10B N6210 Medical Panel PC Page 1 1 Introduction Chapter 1...
Page 19: ...IASO W10B N6210 Medical Panel PC Page 11 2 Unpacking Chapter 2...
Page 22: ...IASO W10B N6210 Medical Panel PC Page 14 3 Installation Chapter 3...
Page 33: ...IASO W10B N6210 Medical Panel PC Page 25 Chapter 4 4 Driver Installation...
Page 36: ...IASO W10B N6210 Medical Panel PC Page 28 Appendix A A Regulatory Compliance...
Page 41: ...IASO W10B N6210 Medical Panel PC Page 33 B Product Disposal Appendix B...
Page 43: ...IASO W10B N6210 Medical Panel PC Page 35 C Maintenance and Cleaning Precautions Appendix C...
Page 46: ...IASO W10B N6210 Medical Panel PC Page 38 Appendix D D Symbol Definitions...
Page 48: ...IASO W10B N6210 Medical Panel PC Page 40 E Watchdog Timer Appendix E...
Page 51: ...IASO W10B N6210 Medical Panel PC Page 43 Appendix F F Error Beep Code...
Page 53: ...IASO W10B N6210 Medical Panel PC Page 45 Appendix G G Hazardous Materials Disclosure...