Integrations

Connect Sentor to the systems already running your site

Sentor sits between the equipment at a site and the people and systems that need to know about it. It reads what your plant, panels and instruments already produce, decides what it means using logic stored on the controller, and acts — switching equipment, raising alarms, notifying people, or reporting upstream into a system you already run.

1 · Direct I/O

Electrical interfaces

The layer most site equipment already speaks. Anything that produces a contact closure, a voltage, a current loop or a temperature output connects without a gateway, a driver or a protocol conversation — which usually means existing instrumentation is reused rather than replaced.

Interface	What it connects and how
Dry contacts	Eight optically isolated digital inputs read clean contact closures from panels, relays, float switches, limit switches and equipment status contacts.
Protected loops	Supervised loops using double 10k end-of-line resistors, so a cut or shorted cable is detected as a fault rather than read as a healthy state.
Analogue voltage	0–1 V, 0–5 V, 0–10 V and 0–30 V on the ST3000. The i7000 reads 0–65 V in a single range at 1 mV resolution, covering 12 V, 24 V and ±48 V supplies on one input without range selection.
Current loop	4–20 mA transducers connect directly — pressure, flow, level, temperature and the rest of the process instrumentation already fitted to most plant. The i7000 resolves to 20 µA.
Temperature	Two-wire sensors powered from the input itself, in °C or °F, with no separate supply to run.
Relay outputs	Eight single-pole double-throw relays, each presenting a common terminal with normally-open and normally-closed contacts. 1 A maximum switching — 24 VDC/24 VAC where UL approval is required, 48 VDC/32 VAC where it is not. Pulsed and timed operation is supported on the i7000.
Analogue outputs	Two 4–20 mA outputs on the i7000, so the controller can drive a control loop or a receiving instrument rather than only switch a contact.
Alarm outputs	Dedicated strobe and siren outputs alongside the programmable relays.
Sensor power	Approximately 800 mA at 12 VDC from the auxiliary supply for powering field sensors, on a rail that stays up on battery through a mains failure.

3 · Protocols — confirm with us

Reporting into systems you already operate

These three are supported, and they are the reason a new site can join the monitoring arrangement you already run instead of starting a second one. They sit in their own section deliberately: unlike the interfaces above, they are not covered by figures in the published specification sheets, so we confirm the detail for your configuration rather than let you assume it.

Interface	What it connects and how
Modbus	Supported. The implementation depends on your configuration, so we confirm the detail directly rather than publish a blanket claim.
DNP3	Available for utilities, water, oil and gas, so Sentor sites report into an existing SCADA master. We confirm the conformance level with you when you enquire.
SNMP	v1, v2 and v3 for network management integration. The ST9-302 board attaches up to 48 SNMP devices and runs standalone or as a slave to the controller.

Integration scenarios

What this looks like on a real site

Each of these follows the same shape: something happens, Sentor receives it, logic decides, an action follows, and somebody is told.

Fire or security panel raises an alarm

Trigger	A fire panel, intruder panel or door contact changes state.
What Sentor receives	A clean contact closure on a digital input, or a supervised loop where a cut cable must also be detected.
Logic applied	The scenario stored on the controller identifies which alarm it is, checks whether the site is armed and whether the condition has persisted, and decides who needs to know.
Action	Relay outputs operate, the event is written to the on-board log with a time and date stamp, and notification goes out.
Who gets the result	The nominated person for that alarm at that site, by SMS, email, pager or a voice call announcing the alarm and the reading.

The log entry is captured on site whether or not the site was in contact with anyone at the time, which is what makes it useful for an audit afterwards.

An authorised operator sends a command to the site

Trigger	Someone needs to act on a site remotely — reset a pump, open a gate, restart equipment, silence an alarm.
What Sentor receives	A DTMF keypad response over a phone call through the ST330, an instruction from SitePRO or SentorCloud, or a contact closure from an external system wired to a digital input.
Logic applied	The controller checks the programmed conditions before acting — a gate does not open if the interlock says it should not, regardless of who asked.
Action	The relevant relay operates: reset a pump, open or close a gate, start or stop equipment, activate a warning light, acknowledge an alarm, or run a predefined site scenario.
Who gets the result	The operator gets confirmation, and the action is written to the event log against the time it happened.

The ST330’s voice-and-keypad path is documented Sentor functionality. Command paths through a third-party dispatch platform depend on that platform offering a contact output or a gateway — ask us and we will confirm what is achievable with your equipment.

Transmitter and RF performance at a tower site

Trigger	Transmit power drifts, reflected power rises, or received signal strength falls.
What Sentor receives	Forward and reflected power through the ST505 bi-directional coupler on two analogue inputs; RSSI as an analogue signal.
Logic applied	The controller calculates a quadratic each time the transmitter keys up, giving readings accurate to decimal level, and compares them against the thresholds set for that site.
Action	An alarm is raised on a VSWR excursion, the trend is logged for compliance reporting, and the transmitter channel can be changed remotely.
Who gets the result	The RF technician, with the reading rather than just the fact of a fault — so the visit is planned with the problem already understood.

The coupler is non-invasive with almost zero insertion loss and screws in line on the coaxial cable. Sentor supplies a calibration utility for commissioning.