POCi-W24C-ULT5 Medical Panel PC
Page 87
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 F-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 POCi-W24C-ULT5
Page 11: ...POCi W24C ULT5 Medical Panel PC Page 1 1 Introduction Chapter 1 ...
Page 25: ...POCi W24C ULT5 Medical Panel PC Page 15 2 Unpacking Chapter 2 ...
Page 29: ...POCi W24C ULT5 Medical Panel PC Page 19 3 Installation Chapter 3 ...
Page 43: ...POCi W24C ULT5 Medical Panel PC Page 33 4 BIOS Setup Chapter 4 ...
Page 77: ...POCi W24C ULT5 Medical Panel PC Page 67 Chapter 5 5 Driver Installation ...
Page 80: ...POCi W24C ULT5 Medical Panel PC Page 70 Appendix A A Regulatory Compliance ...
Page 86: ...POCi W24C ULT5 Medical Panel PC Page 76 B Product Disposal Appendix B ...
Page 88: ...POCi W24C ULT5 Medical Panel PC Page 78 C Maintenance and Cleaning Precautions Appendix C ...
Page 91: ...POCi W24C ULT5 Medical Panel PC Page 81 Appendix D D Symbol Definitions ...
Page 93: ...POCi W24C ULT5 Medical Panel PC Page 83 E BIOS Menu Options Appendix E ...
Page 96: ...POCi W24C ULT5 Medical Panel PC Page 86 Appendix F F Watchdog Timer ...
Page 99: ...POCi W24C ULT5 Medical Panel PC Page 89 Appendix G G Hazardous Materials Disclosure ...