POSEIDON-MIB

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Category: Environmental Monitoring

Description: Monitors HWg Poseidon environmental monitoring units, providing temperature, humidity, and digital input sensor readings.

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What Is POSEIDON-MIB?

POSEIDON-MIB is a vendor-specific MIB for HWg (Hardware Group) Poseidon environmental monitoring units, standalone appliances that watch conditions in server rooms, data centers, and equipment cabinets. It exposes objects for a table of input sensors (temperature, humidity, or digital inputs) with associated values, names, and alarm setup/state, plus an output table for controllable relay outputs. This MIB is explicitly built for hardware/environmental status monitoring: it reports live sensor readings, alarm thresholds, and alarm state, letting an operator detect overheating, humidity excursions, or digital input events (such as a door or leak sensor) before they cause equipment damage. It is a self-contained proprietary MIB registered under HWg's enterprise branch (charonII/poseidon) without dependency on external standard MIBs. It is typically deployed in data centers, telecom closets, or server rooms as a dedicated environmental sensor appliance feeding readings into a broader NMS. Network engineers evaluating or troubleshooting this functionality can download the POSEIDON-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in POSEIDON-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

HWg Poseidon environmental monitoring unit

Monitoring Examples

An administrator would walk inpTable/inpEntry, reading inpValue alongside inpName (e.g., "Server Room Temp") for each configured sensor identified by inpIndex, and check inpAlarmState against inpAlarmSetup thresholds to see if any sensor has crossed into an alarm condition. A temperature sensor's inpValue climbing past its configured inpAlarmSetup threshold with inpAlarmState flipping to active would indicate a cooling failure in the monitored space. The outTable/outEntry with outValue and outIndex would show the state of any relay outputs, such as one wired to trigger an alarm siren or shut off equipment.

What Can Be Monitored

temperature/humidity/digital input sensor values
sensor name and index
alarm setup thresholds
alarm state
relay output values

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Gauge
enterprises

From RFC1213-MIB

DisplayString
sysName

How to Use in IPNetwork Monitor

Example using tsAlarmsPresent OID:

Select a HWg Poseidon environmental monitoring unit as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type tsAlarmsPresent into the Find box to locate it in the OID tree, then select it and click OK. The present number of active alarm conditions. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Gauge32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
hwgroup	1.3.6.1.4.1.21796
charonII	1.3.6.1.4.1.21796.3
poseidon	1.3.6.1.4.1.21796.3.3
NTF inpAlarmStateChanged	1.3.6.1.4.1.21796.3.3.0.1			Input state entered/left alarm condition. This trap always follows tsTrapAlarmStart/tsTrapAlarmEnd.
NTF sensAlarmStateChanged	1.3.6.1.4.1.21796.3.3.0.2			Nth sensor state entered/left alarm condition. This trap always follows tsTrapAlarmStart/tsTrapAlarmEnd.
NTF tsTrapAlarmStart	1.3.6.1.4.1.21796.3.3.0.3			This trap is sent each time an alarm is inserted into to the alarm table. It is sent on the insertion of all alarms except for powerFailure.
NTF tsTrapAlarmEnd	1.3.6.1.4.1.21796.3.3.0.4			This trap is sent each time an alarm is removed from the alarm table. It is sent on the removal of all alarms.
inpTable	1.3.6.1.4.1.21796.3.3.1		not-accessible	A list of binary input entries.
inpEntry	1.3.6.1.4.1.21796.3.3.1.1		not-accessible	An entry containing information applicable to a particular binary input.
NUM inpIndex	1.3.6.1.4.1.21796.3.3.1.1.1	PositiveInteger	not-accessible	The binary input index.
ONO inpValue	1.3.6.1.4.1.21796.3.3.1.1.2	OnOff	read-only	The binary input value.
ION inpName	1.3.6.1.4.1.21796.3.3.1.1.3	IOName	read-write	The binary input name.
INP inpAlarmSetup	1.3.6.1.4.1.21796.3.3.1.1.4	InputAlarmSetup	read-write	You can enable alarm for this binary input. Alarm can be inactive or active for On/Off state.
INP inpAlarmState	1.3.6.1.4.1.21796.3.3.1.1.5	InputAlarmState	read-only	The binary input alarm state.
outTable	1.3.6.1.4.1.21796.3.3.2		not-accessible	A list of binary output entries.
outEntry	1.3.6.1.4.1.21796.3.3.2.1		not-accessible	An entry containing information applicable to a particular binary output.
NUM outIndex	1.3.6.1.4.1.21796.3.3.2.1.1	PositiveInteger	not-accessible	The binary output index.
ONO outValue	1.3.6.1.4.1.21796.3.3.2.1.2	OnOff	read-write	The binary output value. 0 off(open), 1 on(close)
ION outName	1.3.6.1.4.1.21796.3.3.2.1.3	IOName	read-write	The binary output name.
OUT outType	1.3.6.1.4.1.21796.3.3.2.1.4	OutputType	read-only	The binary output type. 0 relay (off, on), 1 rts (-10,+10V), 2 dtr (0,10V)
OUT outMode	1.3.6.1.4.1.21796.3.3.2.1.5	OutputMode	read-write	The binary output mode. 0 manual, 1 autoAlarm, 2 autoTriggerEq, 3 autoTriggerHi, 4 autoTriggerLo
sensTable	1.3.6.1.4.1.21796.3.3.3		not-accessible	A list of sensor table entries. The number of entries corresponds with number of detected sensors.
sensEntry	1.3.6.1.4.1.21796.3.3.3.1		not-accessible	An entry containing information applicable to a particular sensor.
NUM sensIndex	1.3.6.1.4.1.21796.3.3.3.1.1	PositiveInteger	not-accessible	The sensor index.
SEN sensName	1.3.6.1.4.1.21796.3.3.3.1.2	SensorName	read-only	The sensor name.
SEN sensState	1.3.6.1.4.1.21796.3.3.3.1.4	SensorState	read-only	The sensor state.
STR sensString	1.3.6.1.4.1.21796.3.3.3.1.5	SensorString	read-only	The string representation of sensor value.
SEN sensValue	1.3.6.1.4.1.21796.3.3.3.1.6	SensorValue	read-only	The integer (decimal * 10) representation of sensor value.
SEN sensValueRaw	1.3.6.1.4.1.21796.3.3.3.1.7	SensorValue	read-only	The original raw value of sensor (it differs for each sensor type, especially 1-Wire sensors have different precisions).
SEN sensID	1.3.6.1.4.1.21796.3.3.3.1.8	SensorID	read-only	The sensor ID.
UNI sensUnit	1.3.6.1.4.1.21796.3.3.3.1.9	UnitType	read-only	The sensor unit.
STR sensUnitString	1.3.6.1.4.1.21796.3.3.3.1.10	SensorUnitString	read-only	The string representation of sensor unit.
tsAlarm	1.3.6.1.4.1.21796.3.3.50
G32 tsAlarmsPresentEx	1.3.6.1.4.1.21796.3.3.50.1	Gauge32	read-only	The present number of active alarm conditions.
tsAlarmTable	1.3.6.1.4.1.21796.3.3.50.2		not-accessible	A list of alarm table entries. The table contains zero, one, or many rows at any moment, depending upon the number of alarm conditions in effect. The table is initially empty at agent startup. The agent creates a row in the table each time a condition is detected and deletes that row when that condition no longer pertains. The agent creates the first row with tsAlarmId equal to 1, and increments the value of tsAlarmId each time a new row is created, wrapping to the first free value greater than or equal to 1 when the maximum value of tsAlarmId would otherwise be exceeded. Consequently, after multiple operations, the table may become sparse, e.g., containing entries for rows 95, 100, 101, and 203 and the entries should not be assumed to be in chronological order because tsAlarmId might have wrapped. The number of rows in the table at any given time is reflected by the value of tsAlarmsPresent.
tsAlarmEntry	1.3.6.1.4.1.21796.3.3.50.2.1		not-accessible	An entry containing information applicable to a particular alarm.
NUM tsAlarmIdx	1.3.6.1.4.1.21796.3.3.50.2.1.1	PositiveInteger	not-accessible	An index to alarm table.
NUM tsAlarmId	1.3.6.1.4.1.21796.3.3.50.2.1.2	PositiveInteger	read-only	A unique identifier for an alarm condition. This value must remain constant.
INT tsAlarmDescr	1.3.6.1.4.1.21796.3.3.50.2.1.3	INTEGER	read-only	Description of the alarm condition.
SEN tsAlarmSensName	1.3.6.1.4.1.21796.3.3.50.2.1.4	SensorName	read-only	Name of sensor with alarm condition.
TIM tsAlarmTime	1.3.6.1.4.1.21796.3.3.50.2.1.5	TimeStamp	read-only	The value of sysUpTime when the alarm condition was detected. If the alarm condition was detected at the time of agent startup and presumably existed before agent startup, the value of tsAlarmTime shall equal 0.
info	1.3.6.1.4.1.21796.3.3.70
STR infoAddressMAC	1.3.6.1.4.1.21796.3.3.70.1	DisplayString	read-only	MAC address in text form. It is here to distinguish devices in trap messages.
setup	1.3.6.1.4.1.21796.3.3.99
sensSetup	1.3.6.1.4.1.21796.3.3.99.1
UNI unitType	1.3.6.1.4.1.21796.3.3.99.1.1	UnitType	read-write	Units for displayed values. All setup values are fixed in Celsius
sensSetupTable	1.3.6.1.4.1.21796.3.3.99.1.2		not-accessible	A list of sensor table setup entries. The number of entries corresponds with number of detected sensors.
sensSetupEntry	1.3.6.1.4.1.21796.3.3.99.1.2.1		not-accessible	An entry containing setup information for a particular sensor.
NUM sensSetupIndex	1.3.6.1.4.1.21796.3.3.99.1.2.1.1	PositiveInteger	not-accessible	The sensor setup table index.
SEN sensSetupName	1.3.6.1.4.1.21796.3.3.99.1.2.1.2	SensorName	read-write	The sensor name.
SEN sensFlags	1.3.6.1.4.1.21796.3.3.99.1.2.1.5	SensorFlags	read-write	The behaviour of sensor - 0x01: range or level detection - 0x02: enable trap sending -- 0x04: output set (thermostat) - 0x08: sensor enabled - 0x10: enable SMS sending - 0x20: enable email sending.
SEN sensLimitMin	1.3.6.1.4.1.21796.3.3.99.1.2.1.6	SensorValue	read-write	The sensor low limit.
SEN sensLimitMax	1.3.6.1.4.1.21796.3.3.99.1.2.1.7	SensorValue	read-write	The sensor high limit.
SEN sensHysteresis	1.3.6.1.4.1.21796.3.3.99.1.2.1.8	SensorValue	read-write	The sensor hysteresis.

RFC description

Poseidon-MIB defines management objects for SNMP agent implementations, including system and operational monitoring capabilities.

Start monitoring HWg Poseidon environmental monitoring unit with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

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