Industrial wireless communication has traditionally been dominated by complete systems from established automation brands. Phoenix Contact‘s RAD-900 series, part of their Radioline family, represents this approach — a ready-to-deploy wireless I/O and serial transmission system designed to replace cables in large-scale industrial environments. But in recent years, a new class of industrial wireless modules has emerged: modular, highly flexible Sub-1GHz and LoRa modules from companies like Coral RF. These components offer engineers an alternative path — building custom wireless networks from the ground up, with full control over protocols, power consumption, and hardware integration.
This article compares Coral RF‘s Sub-1GHz module portfolio against Phoenix Contact’s RAD-900 industrial wireless transceiver, analyzing their technical approaches, target applications, and where each solution excels.
The RAD-900-IFS is a 900 MHz wireless transceiver within Phoenix Contact‘s Radioline family. It‘s designed as a turnkey solution for industrial automation engineers who need to replace RS-232/RS-485 cables, transmit I/O signals wirelessly, or network multiple controllers across large facilities.
| Parameter | Value |
|---|---|
| Frequency Band | 902–928 MHz (North America) |
| Max Transmission Power | 30 dBm (1W) |
| Receiver Sensitivity | -112 dBm @ 16 kbps, -105 dBm @ 125 kbps, -102 dBm @ 250 kbps, -95 dBm @ 500 kbps |
| Maximum Range | 32 km (line-of-sight) |
| Data Rates | 16 kbps / 125 kbps / 250 kbps / 500 kbps (adjustable) |
| Network Topology | Point-to-point, star, mesh (up to 250 stations) |
| Interfaces | RS-232, RS-485, screw terminals |
| Operating Temperature | -40°C to +70°C |
| Power Supply | 24V DC (10.8–30.5V range) |
The RAD-900 achieves up to 32 km range using adjustable data rates — lower data rates improve receiver sensitivity and extend reach. It supports point-to-point, star, and mesh networks with up to 250 stations, making it suitable for large-scale deployments across oil fields, water treatment plants, and wind farms.
The RAD-900 is built on Phoenix Contact‘s proprietary Trusted Wireless 2.0 technology, which includes several industrial-grade features:
Frequency Hopping Spread Spectrum (FHSS): Uses up to 127 channels in the 2.4 GHz band; the 900 MHz band uses fewer hopping channels.
AES-128 Encryption: Ensures data packets cannot be understood if intercepted.
Coexistence Management: Allows multiple wireless systems to operate in parallel without performance degradation; selective channel blacklisting enables coexistence with Wi-Fi networks.
Distributed Network Management: Unlike centralized approaches (ZigBee, WirelessHART), Trusted Wireless uses parent-child zones where network management happens locally, reducing message traffic and accelerating data exchange.
The RAD-900 supports three operational modes:
I/O Data Mode: Transmits digital and analog I/O signals across the network using simple thumbwheel addressing — no programming required.
Serial Data Mode: Replaces RS-232/RS-485 cables, allowing multiple controllers to communicate wirelessly.
PLC/Modbus RTU Mode: Connects I/O extension modules directly to controllers via Modbus protocol, with diagnostic parameters (signal quality, etc.) stored in Modbus registers.
Phoenix Contact has documented numerous industrial deployments:
Remote oil production monitoring using Radioline to collect data from wellheads.
Water and wastewater infrastructure: The system provides powerful non-line-of-sight remote monitoring communication for SCADA integration.
Tank fill-level monitoring, pipeline monitoring, pumping stations, and chemical park infrastructure.
Ex zone 2 areas, rotating machinery (scraper bridges), and wind farms.
The RAD-900 is a closed, proprietary system. Engineers cannot modify the protocol stack, implement custom encryption, or optimize power consumption for specific battery-operated sensors. The module requires 24V DC power and draws up to 328 mA (peak) — acceptable for infrastructure installations but impractical for battery-powered field devices. Additionally, RAD-900 products are exclusively for export outside the EU and are primarily targeted at North American markets (902–928 MHz).
Coral RF takes a fundamentally different approach. Rather than a complete industrial system, Coral RF manufactures high-performance wireless modules based on Texas Instruments and Semtech chipsets, giving engineers the building blocks to design their own wireless networks. Their product portfolio covers 169 MHz, 433 MHz, 868 MHz, 915 MHz, and 2.4 GHz bands, built on TI’s CC13xx, CC11xx series, and Semtech‘s SX1262 LoRa platform.
| Model | Chipset | Frequency | Max TX Power | RX Sensitivity | Interface | Typical Use |
|---|---|---|---|---|---|---|
| N530AS | CC1310 | 433/868/915 MHz | +14 dBm | -124 dBm @ 0.625 kbps (G)FSK | UART | Ultra-low power sensors |
| N620PA | CC1310 + CC1190 | 868/915 MHz | +27 dBm | Enhanced by CC1190 LNA | USRT+GPIO | Industrial IoT, telemetry |
| N622PA | CC1312R7 + CC1190 | 868/915 MHz | +27 dBm | -121 dBm | UART, SPI | Advanced custom protocol development |
| N427AS | SX1262 + PA | 169/433/868/915 MHz | +33 dBm (2W) | -148 dBm (LoRa) | SPI | LoRaWAN gateways, extreme-range IoT |
| N428AS | SX1262 + PA/LNA | 169/433/868 MHz | +37 dBm (5W) | -148 dBm (LoRa) | SPI | Professional LoRaWAN gateways |
The CC1310 is a highly integrated Sub-1GHz wireless MCU with an ARM Cortex-M3 core, offering exceptional low-power performance for battery-powered applications. CC1310 supports frequency standards below 1GHz such as 315 MHz, 433 MHz, 780 MHz, 868 MHz, and 915 MHz. With the same signal strength, Sub-1GHz delivers better communication performance than 2.4 GHz technologies, achieving communication distances of several kilometers — at 315 MHz, the range exceeds 2.4 GHz Wi-Fi by more than eight times. Receiver sensitivity reaches -110 dBm at 50 kbps and down to -124 dBm at 0.625 kbps.
N620PA High-Power Sub-1GHz Module: Built on CC1310 with CC1190 RF front-end, delivers +27 dBm output power (≈500 mW) with enhanced receiver sensitivity. Achieves line-of-sight distances exceeding 10 km with proper antenna selection, overcoming obstacles like walls, foliage, and industrial structures. Applications include industrial remote control (cranes, mining equipment), smart metering, telemetry for oil & gas and agriculture, drone telemetry, and security systems.
N622PA Next-Generation Module: Features the advanced CC1312R7 wireless MCU with 704 KB flash — ample space for complex custom network stacks, sophisticated application logic, and secure Over-the-Air (OTA) update engines. Provides complete IP and architectural control; engineers have full low-level access, keeping their entire protocol stack proprietary. Balanced power efficiency allows sophisticated power management schemes to extend battery life in field devices.
For applications where maximum range is paramount, Coral RF offers high-power LoRa modules based on Semtech‘s SX1262 transceiver.
N427AS: +33 dBm (2W) output power with -148 dBm sensitivity (LoRa mode), delivering the longest possible LoRa links. Fully supports LoRaWAN protocol for public and private IoT networks. Applications include LoRaWAN gateways, long-range smart meters, industrial and agricultural sensors, and asset tracking devices.
N428AS: The extreme-range flagship, delivering +37 dBm (5W) transmit power while maintaining -148 dBm sensitivity (LoRa mode), creating an unsurpassed link budget exceeding 185 dB. Enables reliable communication over tens of kilometers in challenging non-line-of-sight conditions. Rated for -40°C to +80°C operation, ensuring reliability in remote mining sites and harsh agricultural environments. Designed for professional LoRaWAN gateways, private networks, and extreme-range telemetry.
Coral RF provides USB dongles for Sub-1GHz and Zigbee protocols: LoRa SX1262, CC1120, CC1312, and CC1314 dongles; Zigbee and BLE dongles based on CC2538, CC2650, CC2651, CC2674 and CC2652 with optional CC2592 PA; and multi-protocol gateways. These dongles function as portable spectrum sniffers, gateway adapters, and development tools, pre-loaded with firmware that allows host control via AT commands.
Full protocol control: Engineers can implement proprietary protocols, custom encryption, and optimized MAC layers.
Ultra-low power operation: Sleep currents as low as 0.2 μA (CC1101) and 0.6 μA (CC1310), enabling 5-10 year battery life in remote sensors.
Global frequency support: Single hardware platform covers multiple ISM bands (433/868/915 MHz) for worldwide deployment.
Hardware compatibility: Many modules share the same footprint, allowing easy migration from low-power to high-power versions without PCB redesign.
Cost-effective: Modular components at a fraction of the cost of complete industrial systems.
| Aspect | Phoenix Contact RAD-900 | Coral RF Modules |
|---|---|---|
| Product Type | Complete industrial wireless system (transceiver + I/O) | Individual RF modules (building blocks) |
| Target User | Automation engineers, system integrators | Embedded developers, hardware engineers |
| Frequency Bands | 902–928 MHz (North America) | 169/433/868/915 MHz, 2.4 GHz (global) |
| Max Output Power | +30 dBm (1W) | Up to +37 dBm (5W) |
| Receiver Sensitivity | -112 to -95 dBm (depending on data rate) | Down to -148 dBm (LoRa mode) / -124 dBm (G)FSK |
| Maximum Range | 32 km (LOS) | 10+ km (CC1310), tens of km (LoRa) |
| Network Topology | Point-to-point, star, mesh (250 nodes) | Fully customizable (engineer-defined) |
| Programming Required | No (thumbwheel configuration) | Yes (full embedded development) |
| Power Source | 24V DC (industrial power) | 2.0–3.6V (battery or low-voltage supply) |
| Current Consumption (TX) | 328 mA @ +30 dBm | ~23 mA @ +14 dBm (CC1310), ~1200 mA @ +33 dBm (SX1262) |
| Sleep Current | Not applicable (line-powered) | 0.2 μA (CC1101), 0.6 μA (CC1310) |
| Protocol | Proprietary (Trusted Wireless 2.0) | Customizable (LoRaWAN, 6LoWPAN, proprietary) |
| Security | AES-128, FHSS, integrity check | Hardware AES-128/256 (user-configurable) |
| Integration Level | Complete system (radio + I/O + enclosure) | Component-level (requires host MCU/PCB) |
| Operating Temp | -40°C to +70°C | -40°C to +85°C |
| Certifications | FCC, IC, cULus, NOM | FCC, CE, IC, SRRC (pre-certified modules) |
| Best For | Cable replacement, SCADA integration | Custom IoT sensors, gateways, embedded systems |
Battery-powered remote sensors: Modules like CC1310 draw 0.6 μA in sleep mode, enabling 5-10 year battery life for water meters, soil sensors, or wildlife trackers.
Custom protocol development: The CC1312R7 provides 704KB flash for proprietary stacks, keeping your IP secure and enabling unique network optimizations.
Extreme range LoRaWAN gateways: N428AS delivers +37 dBm with -148 dBm sensitivity — 185+ dB link budget for tens of kilometers in NLOS conditions.
Multi-band global deployment: Coral RF modules support 169/433/868/915 MHz on the same hardware — one design serves multiple regions.
Cost-sensitive volume production: Individual modules eliminate the overhead of a complete industrial system.
System integrator projects: Quick deployment without embedded programming expertise.
Legacy cable replacement: Replacing RS-232/RS-485 cables with minimal engineering effort.
SCADA integration: Modbus RTU native support with diagnostic parameters in Modbus registers.
Large-scale mesh networks: Up to 250 stations with distributed network management — proven in oil fields, water treatment plants, and wind farms.
Harsh industrial environments: -40°C to +70°C operation, IP20 enclosure, industrial power supply.
Regulatory compliance: FCC, IC, cULus pre-certified for North American industrial markets.
Some projects benefit from both approaches: Use Coral RF modules in battery-powered remote sensors and edge gateways, then connect to a RAD-900 backbone at the control room. The gateway translates between LoRaWAN or proprietary Sub-1GHz protocols and Modbus RTU, bridging modular sensor networks with industrial automation infrastructure.
Phoenix Contact‘s Trusted Wireless 2.0 uses FHSS (up to 127 channels in the 2.4 GHz band, fewer in 900 MHz), providing excellent interference immunity in congested industrial environments. Coral RF modules can implement FHSS as well — engineers have full control to program custom hopping sequences, channel blacklisting, and dwell times. The CC1312R7’s ample flash accommodates sophisticated FHSS algorithms with AES-128/256 rolling key anti-jamming.
Both solutions recognize the fundamental inverse relationship between data rate and sensitivity. Trusted Wireless provides adjustable data rates to increase receiver sensitivity for longer distances. Coral RF takes this further — CC1310 achieves -124 dBm at 0.625 kbps (G)FSK and -110 dBm at 50 kbps. LoRa modules push sensitivity to -148 dBm using spread spectrum modulation, achieving usable links at negative signal-to-noise ratios.
Trusted Wireless 2.0 implements AES-128 encryption, frequency hopping, and sender authenticity verification via integrity checks. Coral RF modules built on CC1312R and CC2538 include hardware AES-128/256 and SHA-1/256 accelerators, enabling efficient encryption without CPU overhead. For maximum security, engineers can implement custom encryption protocols on the host MCU.
The RAD-900 is designed for line-powered industrial installations — its 24V DC supply and 328 mA peak consumption reflect this. Coral RF modules excel where power is limited. A typical CC1310 sensor node transmitting daily can operate for years on a coin cell battery (0.6 μA sleep, ~23 mA TX @ +14 dBm). This fundamental difference dictates application suitability: line-powered infrastructure vs. battery-powered field devices.
Phoenix Contact RAD-900 and Coral RF‘s Sub-1GHz modules represent two valid but distinct approaches to industrial wireless communication:
RAD-900 is a complete, turnkey system for automation engineers who need reliable wireless I/O and serial communication without embedded programming. Its Trusted Wireless 2.0 technology provides FHSS, AES-128 encryption, and mesh networking out of the box. Ideal for cable replacement projects, SCADA integration, and large-scale industrial mesh networks in oil & gas, water treatment, and energy management.
Coral RF offers modular building blocks for engineers who need full control. With output power up to +37 dBm, sensitivity down to -148 dBm (LoRa), sleep current as low as 0.2 μA (CC1101) or 0.6 μA (CC1310), and global frequency support from 169 MHz to 2.4 GHz, Coral RF modules enable custom IoT networks with precise optimization for range, power, and cost. The CC1312R7's 704KB flash supports proprietary protocol development, while SX1262-based modules deliver LoRaWAN compatibility for public/private IoT networks.
The choice depends entirely on the application. For large-scale infrastructure projects where quick deployment and industrial standards matter, RAD-900 is proven. For battery-powered remote sensors, custom IoT networks, and applications where control over every layer of the protocol stack is essential, Coral RF modules provide unmatched flexibility and performance.
Ultimately, these solutions are not mutually exclusive — many industrial IoT deployments will benefit from combining both: Coral RF modules at the edge, collecting sensor data and transmitting over long distances, feeding into a RAD-900 backbone that integrates with existing PLC and SCADA infrastructure. In this hybrid architecture, engineers get the best of both worlds: ultra-low-power edge sensing with modular flexibility, and proven industrial reliability for backbone infrastructure.