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Chapter 1 Introduction
1. 1 What is the ASUS System Management
There are two components for ASUS System Management. One is ASMM – ASUS
System Monitoring Module, the other one is ASMA – ASUS System Monitoring Agent.
ASMM had been implemented on an ISA card and ASUSTek mainboards. This hardware
module provides Fan speed, Voltage, Temperature and Chassis Intrusion information of
system and Automatic Server Restart function. ASMA contains ASMM’s driver and its
SNMP agent. Through SNMP Agent, Network management software such as HP
OpenView can monitor the system's fan speeds, working voltage and system temperature.
SNMP Agent will report to Network Manager immediately to prevent problems from
getting worse when the server's in an abnormal state.
1.2 ASMM Overview
Basically the ASMM card is a 8 bit ISA Server Monitor Card and it includes the 20-pin
external feature connector for ASUSTek SMH (Server Monitoring Header).
The connections are classified into 2 categories: Chassis Intrusion and Fan Monitor:
Chassis Intrusion: Chassis Intrusion permits the activation of a user-installed alarm. One 3
wires cable supports the external customized chassis intrusion alarm. The pin definition are
: RED ( battery power ), YELLOW ( intrusion signal), and BLACK ( ground ). The
external intrusion signal should be open-drained. Fan Monitor: The fan monitor provides
power for up to 3 fan while monitoring the connected fans’ rotation through the specially
designed tachomter. Three 3 wire cables are used to extend the length of each fan
connection. The pin definitions are: YELLOW ( tachometer signal ), RED ( +12V) , and
BLACK ( ground ).
The system can be notified when the voltage/temperature/fan speed exceeds the predefined
thresholds. The notification mechanism can be a simple as polling or through SMI#/IRQ
service routine, depending on the programming of LM78. Five ISA IRQ can be selected
(IRQ 3,4,5,6,7) through hardware jumper.