Owner manual
Table Of Contents
- 1 Introduction
- 2 Unpacking
- 3 Connectors
- 3.1 Peripheral Interface Connectors
- 3.2 Internal Peripheral Connectors
- 3.2.1 Audio Connector
- 3.2.2 Battery Connector
- 3.2.3 CompactFlash® Slot
- 3.2.4 Digital I/O Connector
- 3.2.5 Fan Connector (CPU)
- 3.2.6 Fan Connector (System)
- 3.2.7 Front Panel Connector
- 3.2.8 Keyboard/Mouse Connector
- 3.2.9 Backlight Inverter Connector
- 3.2.10 LVDS1 LCD Connector
- 3.2.11 Parallel Port Connector
- 3.2.12 PCI-104 Connector
- 3.2.13 PCIe Mini Card Slot
- 3.2.14 12V Power Connector
- 3.2.15 SATA Drive Connectors
- 3.2.16 SATA Power Connector
- 3.2.17 Serial Port Connectors (RS-232)
- 3.2.18 Serial Port Connector (RS-232/422/485)
- 3.2.19 SMBus Connector
- 3.2.20 SPI Flash Connector
- 3.2.21 TPM Connector
- 3.2.22 USB Connectors
- 3.3 External Peripheral Interface Connector Panel
- 4 Installation
- 4.1 Anti-static Precautions
- 4.2 Installation Considerations
- 4.3 Unpacking
- 4.4 SO-DIMM Installation
- 4.5 Jumper Settings
- 4.5.1 AT Auto Button Power Select Jumper Settings
- 4.5.2 AT/ATX Power Select Jumper Settings
- 4.5.3 Clear CMOS Jumper
- 4.5.4 COM 3 Function Select Jumper
- 4.5.5 COM 3 RS-422/485 Function Select Jumper
- 4.5.6 CompactFlash® Card Setup
- 4.5.7 CompactFlash® Voltage Selection
- 4.5.8 LVDS1 Screen Resolution Selection
- 4.5.9 LVDS Voltage Selection
- 4.5.10 PCI-104 Voltage Setup
- 4.6 Chassis Installation
- 4.7 Internal Peripheral Device Connections
- 4.8 External Peripheral Interface Connection
- 4.9 Software Installation
- 5 BIOS Screens
- A BIOS Menu Options
- B One Key Recovery
- C Terminology
- D Watchdog Timer
- E Hazardous Materials Disclosure
NANO-PV-D4251/N4551/D5251 EPIC SBC
Page 135
NOTE:
The following discussion applies to DOS environment. IEI support is
contacted or the IEI website visited for specific drivers for more
sophisticated operating systems, e.g., Windows and Linux.
The Watchdog Timer is provided to ensure that standalone systems can always recover
from catastrophic conditions that cause the CPU to crash. This condition may have
occurred by external EMI or a software bug. When the CPU stops working correctly,
Watchdog Timer either performs a hardware reset (cold boot) or a Non-Maskable Interrupt
(NMI) to bring the system back to a known state.
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 D-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. While 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.