💾 Archived View for gemini.spam.works › mirrors › textfiles › computers › DOCUMENTATION › hyperups.t… captured on 2022-06-12 at 06:34:01.
-=-=-=-=-=-=-
UPS Monitor
HyperDisk can monitor the status of any Uninterruptable Power Supply (UPS) that
has a serial port. This is very useful for machines that are run unattended
such as file servers and communiation workstations. By monitoring the UPS,
HyperDisk can help prevent data loss by shutting down whenever the computer is
not running on normal power. This helps prevent any data that would be in a
"staged write" buffer from being lost by turning off staged writes whenever
normal power is not being used.
The UPS Monitoring function is very flexible and can monitor any I/O port
for active signals. Multiple signals can be monitored as well as signals with
different polarity.
The UPS Monitoring function can work in conjuntion with other monitors such
as the monitors built into Lantastic and Novell.
Use the UP: parameter to set up the UPS Monitoring function.
UP:{IoPort}:{IoPolarity}:{IoMask}:{CacheMask}[:{PollSeconds}[:{PollCount}]]
Items in {} are required, item in [] optional.
IoPort Input port address. This is the address of the port to be monitored.
This number must be in Hexidecimal format.
IoPolarity Inverts sense of input port bits. Normally the monitor looks for a
"high" signal for a true occurance of a state. By switching the
polarity, the monitor will look for a low occurance of the state.
0 does not change value
1 inverts bits sense
IoMask Determines which bits to test for non-zero conditions.
0 drops bit from test
1 retains IoPort bit value.
Non-Zero results indicates active UPS (AC power off)
Zero results indicates inactive UPS (AC power on)
CacheMask is a bit field
1 disables function if this bit occurs
0 no change to function if this bit occurs
Bit BitName A one (1) will disable the corresponding function
0 StagedFloppy Stage Write floppy drive write operations
1 StagedHard Stage Write hard drive write operations
2 VerifyFloppy Verify floppy drive write operations
3 VerifyHard Verify hard drive write operations
4 Reserved0 Reserved always 0
5 Reserved1 Reserved always 0
6 FloppyEnable Enable floppy caching
7 CacheEnabled Enable all caching functions
PollSeconds Sets the period in seconds to sample IoPort value. Every nn
seconds the I/O port will be checked for changes in status.
PollCount Sets the number of identical IoPort samples before changeing
the cache state. This tells the monitor how many times it should
wait after seeing a change in the state of the UPS before it should
change the status of the cache. This helps keep the cache from
changing states if the UPS just goes onto battery power for a
moment such as during a brown out.
IoMask Values for COM port based UPS monitoring system
To set the IOMask values you must determine which pin on the I/O port you
are going to use to monitor the UPS. Most of the UPS' use the Carrier
Detect Pin on a PC serial port to monitor the UPS status.
To calculate the IOPort address to use you must first determine which
port you are going to be monitoring, then, calculate the offset to the
port register that you will be using. In most cases you will be using a
serial port at either COM1 or COM2 and monitoring the Modem Status Register.
To monitor the Modem Status Register on COM1 you would calculate the following
address:
COM1 is generally located at 3F8.
COM2 is generally located at 2F8.
Modem Status Register is 6 Bytes from the port address.
The IOPort address would be 3F8 (COM1) + 6 (MSR) = 3FE for COM1
The IOPort address would be 2F8 (COM2) + 6 (MSR) = 2FE for COM2
Below is a list of the common pins used to monitor UPS functions.
9-Pin Port 25-Pin Port Signal Name IoMask IoPolarity
Pin 1 Pin-8 Carrier Detect 80 00
Pin 6 Pin-6 Data Set Ready 20 00
Pin 8 Pin-5 Clear To Send 10 00
Pin 9 Pin-22 Ring Indicator 40 00
To make your own cable for the American Power Conversion (APC) UPS follow the
pin-out details below:
APC 9 pin interface Computer 9 pin interface
Cable end: Male (Pins) Cable end: Female (Sockets)
Pin 2 - AC Power Fault------------------Pin 1 - Modem Data Carrier Detect
Pin 4 - Signal Ground-------------------Pin 5 - Signal Ground
Example:
Monitor COM2, Modem Status port: Bit 7, Carrier Detect, normal polarity
If power fails disable Staged Writes on both hard and floppy drives
30 second sample period, 3 matching samples indicates active/inactive UPS
HYPERDK UP:2FE:0:80:3:30:3