RF & Wireless Systems · Hardware

Wireless Analog & Digital Data Link

RT152-M16 / SLI16 / SLR16

Carry 4–20 mA / 0–10 V signals wirelessly.

RT152 M16 master unit: DIN-rail housing with 16-input and RS485 terminals on top, 433 MHz antenna and 16 input LEDs

Overview

The problem in the field. Between a field sensor (level, pressure, flow, temperature) and the control room there may be a road, a river, a railway, another company's property or simply several hundred meters. Running cable means trenching, permits and theft; the longer a 4–20 mA line gets, the more noise and grounding problems it picks up. Collecting multi-point contact signals (motor status, doors, level switches) one cable at a time is expensive.

The solution. The data link digitizes the digital inputs and analog signals at one end and carries them over 433 MHz to the other end, where relay and analog outputs hand them to the PLC "as if hard-wired". The M16 master unit of the RT152 family collects 16 inputs, talks to the PLC over RS485 / Modbus RTU and is monitored through a web interface; SLI16 input and SLR16 relay expansion units increase the channel count. If the link drops, the outputs go to a defined safe state and a fault contact is signaled.

Expansion. The new series targets a battery-powered telemetry node (powering a level/flow/pressure sensor from a battery or solar panel and reporting periodically) and a pulse (meter) input (wireless reading of water/electricity meters through their S0 pulse output, sharing its platform with the Wireless Meter Reading Node). Modbus TCP via the Wireless Gateway / RTU, cloud monitoring via Telemetry & Process Intelligence and use as a building block of the IIoT Retrofit Kit are planned.

RT152 family side by side on a DIN rail: M16 master, SLI16 input and SLR16 relay units — Product family

Features

Transparent I/O: an input contact appears as a relay at the far end; to the PLC it behaves like a cable.
One-to-one analog transfer: 0/4–20 mA, 0–10 V, potentiometer, joystick (analog/digital); the same platform as the analog speed transfer in crane and machine remotes.
Master + expansion architecture: M16 master with SLI16 input and SLR16 relay expansion units.
RS485 / Modbus RTU: channel states and analog values are passed to the PLC as registers.
Web interface (M16): channel status, RSSI and configuration from a browser.
Link monitoring: heartbeat packets, link-fault relay and LED, defined safe state.
Optional modules: directional antenna and IP65 field enclosure.
TargetAdjustable safe state: the timeout and output state on link loss are user-configurable.
TargetModbus TCP and cloud: Modbus TCP through the Wireless Gateway / RTU, cloud monitoring through Telemetry & Process Intelligence.
TargetTelemetry node: battery or solar powered; periodic reports from a level, flow or pressure sensor with battery and RSSI data; shared with the well and reservoir system.
TargetPulse (meter) input: S0 water/electricity meter reading and production counting; the same EC-PLS board as the meter reading node.
TargetRepeater: range extension with the same hardware.
TargetIIoT Retrofit Kit building block: connecting legacy machine fleets without tearing anything out.

RT152 family

RT152 family
Model code	Unit	Contents	Status	Request a quote
M16	Master unit	16 inputs; RS485 / Modbus RTU; web interface (channel status, RSSI, configuration)	In the field	Request a quote: M16
SLI16	Input expansion	Additional input channels for the master	In the field	Request a quote: SLI16
SLR16	Relay expansion	16 relay outputs	In the field	Request a quote: SLR16
—Target	Telemetry node	Battery or solar powered; level, flow or pressure sensor; periodic reports with battery and RSSI data	Planned	Request a quote: Telemetry node
—Target	Pulse-input version	4× S0/reed meter inputs; shared with the meter reading node	Planned	Request a quote: Pulse-input version

Specifications

Values marked “Target” are design targets, next-generation values or chip-vendor data; they are updated as measurement and certification are completed.

Current system (RT152)
Family	M16 master + SLI16 input and SLR16 relay expansion units
Frequency	433 MHz
Digital channels	16 digital inputs + 16 relays; more with expansion units
Analog channels	8 analog outputs; 4–22 mA analog input
Analog signal types	0/4–20 mA, 0–10 V, potentiometer, joystick
PLC interface	Relay contacts, analog outputs, RS485 / Modbus RTU
Web interface	Channel status, RSSI and configuration (M16)
On link loss	Outputs go to a defined safe state; link-fault contact and LED

Radio (new series)
Frequency band	433.05–434.79 MHz, 8 channels; 868 MHz as an optionTarget
Output power	+22 dBmTarget
Receiver sensitivity	−129 dBm @ SF11Target
Modulation	LoRa SF7–SF10 (low SF for faster analog updates)Target
Data rate	~5.5 kbps at SF7Target
Antenna connector	SMA (EC carrier board)Target

Range
Open field	≥ 2000 m (SF9, 2 m height)Target
Industrial environment	≥ 300 mTarget

Communication & security
Encryption	AES-128-CCMTarget
Addressing	16-bit network ID (NetID) + 16-bit addressTarget
Systems on the same site	≥ 8 independent networksTarget

Performance & fail-safe
Digital input → relay	≤ 100 ms (SF7)Target
Analog update rate	100 ms–10 s, adjustableTarget
Fail-safe on link loss	1–60 s, adjustableTarget
Watchdog	Independent hardware watchdog (IWDG)Target

Power
Supply	9–36 VDC; 230 VAC adapterTarget
Consumption	Depends on the number of relays
Standby consumption	< 2 WTarget
Battery node	Based on EM-G0L-433-LP; sleep < 10 µA; ≥ 3 years at 15-minute reportingTarget

Inputs / outputs (new series)
Digital inputs	16 opto-isolated inputs, 12–24 V (EC-DIO16)Target
Relay outputs	16 relays 5 A / 250 VAC or transistor outputs (EC-DIO16)Target
Analog inputs	4× 4–20 mA / 0–10 V, 16-bit (EC-AIO)Target
Analog outputs	2× 4–20 mA / 0–10 V, 12-bit DAC (EC-AIO)Target
Pulse inputs	4× S0/reed, ≤ 10 kHz (EC-PLS)Target

Interfaces (new series)
Serial communication	Isolated RS485, Modbus RTU (EC-485); Modbus TCP through the Wireless Gateway / RTUTarget
Wi-Fi / web	Configuration over web and BLE via ESP32 (EM-G0LW)Target

Mechanical & environmental
Enclosure	DIN-rail housing, 6–9 modulesTarget
Mounting	35 mm DIN railTarget
Operating temperature	−25…+70 °CTarget
Humidity	Up to 95 %, non-condensingTarget

Warranty & service
Warranty	2 years; manufacturing and service in Ankara

Applications

Water and wastewater plants
Well and reservoir sites
Mines and quarries
Cement and chemical plants
Glass / porcelain kiln lines
Machine-to-panel analog control
Crane / machine receiver side
Energy and infrastructure sites
Legacy machine fleets (retrofit)

The ready-made system for well and reservoir applications is described on the Wireless Well & Reservoir Control System page. Analog speed transfer in crane and machine remotes uses the same platform as the Wireless Crane Control System and Wireless Machine Start & Control.

Target applications: level/flow/pressure telemetry and leak/loss monitoring in water networks (with Telemetry & Process Intelligence).

Fuel tank sites: tank farms are ATEX/Ex zones and the current hardware has no Ex certification. This application is only considered case by case, with Ex-certified sensors and installation outside the zone or in a certified enclosure.

Compliance & documentation

There is no CE declaration of conformity or RED test report for the RT152 family yet. Product documentation is being prepared according to the plan below, starting at module level.

CE – RED 2014/53/EU (EN 300 220-2, EN 301 489-1/-3)
Starting at module level
Target
EMC – EN 61326-1 / EN 61000-6-2 / EN 61000-6-4
Target
LVD – EN 61010-1
Version with 230 VAC adapter
Target
RoHS declaration
Target
ATEX / Ex
Fuel tank sites are assessed separately, case by case
Out of scope
CE declaration of conformity, user manual, Modbus register map and terminal diagram
Target

References

Some of the organizations using this product family.

Adel Elektrik Otomasyon

Frequently asked questions

Will my PLC see the signal as if it were wired?

Yes. A digital input comes out as a relay contact at the far end and an analog 4–20 mA signal comes out as 4–20 mA; the values can also be read as registers over Modbus RTU.

What happens to the outputs if the link drops?

After a defined timeout the output end puts the relays into a safe state and drives the analog output to a fault value; the link fault is signaled by a contact and an LED. The new series targets an adjustable timeout and safe state.

Do several links on the same site interfere with each other?

No; every link has its own ID. The new series targets at least 8 independent networks through channel and network-ID combinations.

How many channels can it carry?

The current system carries 16 digital inputs + 16 relays (more with expansion units) and offers 8 analog outputs and a 4–22 mA analog input. The new series targets 4 analog inputs (16-bit), 2 analog outputs and 4 pulse inputs.

How can the range be extended?

Mount the antenna high and in line of sight, and use a directional antenna (Industrial RF Antenna Series). The new series targets repeater support.

Can I read meters with it?

Water and electricity meter reading is targeted with a pulse (S0) input version; it shares its platform with the Wireless Meter Reading Node.

Can it run on batteries?

The telemetry node version is intended to report periodically on battery or solar power. Continuous analog transfer requires a 24 V supply.

Can it be used on fuel tanks?

Tank sites are Ex zones and the current hardware has no Ex certification. It is only considered case by case, with installation outside the zone and Ex-certified sensors.

What about warranty and service?

2-year warranty; manufacturing and service in Ankara.

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