124 lines
4.9 KiB
Plaintext
124 lines
4.9 KiB
Plaintext
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UPS Monitor
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HyperDisk can monitor the status of any Uninterruptable Power Supply (UPS) that
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has a serial port. This is very useful for machines that are run unattended
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such as file servers and communiation workstations. By monitoring the UPS,
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HyperDisk can help prevent data loss by shutting down whenever the computer is
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not running on normal power. This helps prevent any data that would be in a
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"staged write" buffer from being lost by turning off staged writes whenever
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normal power is not being used.
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The UPS Monitoring function is very flexible and can monitor any I/O port
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for active signals. Multiple signals can be monitored as well as signals with
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different polarity.
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The UPS Monitoring function can work in conjuntion with other monitors such
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as the monitors built into Lantastic and Novell.
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Use the UP: parameter to set up the UPS Monitoring function.
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UP:{IoPort}:{IoPolarity}:{IoMask}:{CacheMask}[:{PollSeconds}[:{PollCount}]]
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Items in {} are required, item in [] optional.
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IoPort Input port address. This is the address of the port to be monitored.
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This number must be in Hexidecimal format.
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IoPolarity Inverts sense of input port bits. Normally the monitor looks for a
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"high" signal for a true occurance of a state. By switching the
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polarity, the monitor will look for a low occurance of the state.
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0 does not change value
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1 inverts bits sense
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IoMask Determines which bits to test for non-zero conditions.
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0 drops bit from test
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1 retains IoPort bit value.
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Non-Zero results indicates active UPS (AC power off)
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Zero results indicates inactive UPS (AC power on)
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CacheMask is a bit field
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1 disables function if this bit occurs
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0 no change to function if this bit occurs
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Bit BitName A one (1) will disable the corresponding function
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0 StagedFloppy Stage Write floppy drive write operations
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1 StagedHard Stage Write hard drive write operations
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2 VerifyFloppy Verify floppy drive write operations
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3 VerifyHard Verify hard drive write operations
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4 Reserved0 Reserved always 0
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5 Reserved1 Reserved always 0
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6 FloppyEnable Enable floppy caching
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7 CacheEnabled Enable all caching functions
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PollSeconds Sets the period in seconds to sample IoPort value. Every nn
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seconds the I/O port will be checked for changes in status.
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PollCount Sets the number of identical IoPort samples before changeing
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the cache state. This tells the monitor how many times it should
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wait after seeing a change in the state of the UPS before it should
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change the status of the cache. This helps keep the cache from
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changing states if the UPS just goes onto battery power for a
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moment such as during a brown out.
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IoMask Values for COM port based UPS monitoring system
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To set the IOMask values you must determine which pin on the I/O port you
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are going to use to monitor the UPS. Most of the UPS' use the Carrier
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Detect Pin on a PC serial port to monitor the UPS status.
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To calculate the IOPort address to use you must first determine which
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port you are going to be monitoring, then, calculate the offset to the
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port register that you will be using. In most cases you will be using a
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serial port at either COM1 or COM2 and monitoring the Modem Status Register.
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To monitor the Modem Status Register on COM1 you would calculate the following
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address:
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COM1 is generally located at 3F8.
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COM2 is generally located at 2F8.
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Modem Status Register is 6 Bytes from the port address.
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The IOPort address would be 3F8 (COM1) + 6 (MSR) = 3FE for COM1
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The IOPort address would be 2F8 (COM2) + 6 (MSR) = 2FE for COM2
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Below is a list of the common pins used to monitor UPS functions.
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9-Pin Port 25-Pin Port Signal Name IoMask IoPolarity
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Pin 1 Pin-8 Carrier Detect 80 00
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Pin 6 Pin-6 Data Set Ready 20 00
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Pin 8 Pin-5 Clear To Send 10 00
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Pin 9 Pin-22 Ring Indicator 40 00
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To make your own cable for the American Power Conversion (APC) UPS follow the
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pin-out details below:
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APC 9 pin interface Computer 9 pin interface
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Cable end: Male (Pins) Cable end: Female (Sockets)
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Pin 2 - AC Power Fault------------------Pin 1 - Modem Data Carrier Detect
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Pin 4 - Signal Ground-------------------Pin 5 - Signal Ground
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Example:
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Monitor COM2, Modem Status port: Bit 7, Carrier Detect, normal polarity
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If power fails disable Staged Writes on both hard and floppy drives
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30 second sample period, 3 matching samples indicates active/inactive UPS
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HYPERDK UP:2FE:0:80:3:30:3
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