The Emerson 1420A2A3A2N1WL2RD Smart Wireless Gateway serves as the central hub for self-organizing WirelessHART networks, connecting field instruments to host systems and data applications with greater than 99% wireless data reliability. Designed for panel or enclosure mounting in industrial environments, this 24 VDC-powered gateway combines native integration capabilities with layered security, making it a practical choice for facilities seeking to extend visibility into process measurements without extensive wiring infrastructure.
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Model Code Decoding
The model string 1420A2A3A2N1WL2RD can be parsed using Emerson’s official ordering information :
Code Segment Meaning
1420 Wireless Gateway base model
A 100-device network capacity, 10.5–30 VDC input
2 Dual Ethernet connection (separate IP addresses, firewall isolation)
A3 2.4 GHz DSSS, WirelessHART protocol, user-configurable update rate
2 Ethernet protocols: Webserver, Modbus TCP/IP, AMS Ready, HART-IP
N1 ATEX Type n certification
WL2 Remote Omni-Antenna Kit, 50 ft. (15.2 m) cable, Lightning Arrestor
RD Redundancy option (hot standby capability)
The part number 753-6026-3005/AB REV.AA referenced alongside this unit corresponds to Emerson’s internal assembly or revision identifier, indicating the specific hardware revision level.
Core Functionality and Network Management
The 1420 Gateway automatically manages WirelessHART communications in constantly changing environments, eliminating the need for manual communication path configuration. The self-organizing network architecture allows field devices to establish multiple independent communication paths, with automatic route selection ensuring data reliability even when physical obstructions are introduced. This capability makes the gateway suitable for retrofitting existing facilities where site surveys were not conducted prior to installation.
The unit supports up to 100 wireless devices, providing scalability for phased deployments or large-scale sensor networks.
Host System Integration
Integration flexibility is a defining characteristic of the 1420 Gateway. Ethernet connectivity supports Modbus TCP/IP, OPC, HART-IP, and EtherNet/IP, while optional Modbus RTU via RS-485 accommodates legacy serial systems. The gateway’s native integration with DeltaV and Ovation automation systems enables straightforward commissioning for facilities already operating within the Emerson ecosystem.
The integrated web interface allows configuration of the wireless network and data integration without additional software installation, simplifying setup and ongoing maintenance. An internal firewall provides packet inspection and configurable port management for enhanced network security.
Security Architecture
The gateway employs a layered security approach: authentication verifies sender and receiver registration, verification confirms data integrity, 128-bit encryption protects payloads, and automatic key management periodically rotates encryption keys. Secure HTTP (HTTPS) and SSL connections govern Ethernet communications with the control system, while unused ports remain closed by default.
Redundancy and Availability
The RD (Redundancy) option in this model configuration enables hot standby capability with automatic fault detection. In a redundant pair, two gateways function as a single system, eliminating the need for duplicate host integration while ensuring continuous wireless network availability in the event of primary unit failure. This configuration requires the dual Ethernet option (code 2), which this model includes.
Environmental and Certification Specifications
Specification Detail
Input Power 24 VDC nominal (10.5–30 VDC range)
Operating Temperature -40°C to +65°C (ATEX Type n rating: Ex nA IIC T4 Gc)
Housing: Low-copper aluminum, NEMA 4X
Certification (this unit): ATEX Type n (N1)
Radio 2.4 GHz DSSS, FCC ID: SJC-M2140 / IC ID: 5853A-M2140
Maximum Input Voltage Ui = 28 VDC
The ATEX Type n certification (N1) indicates suitability for Zone 2 hazardous areas where explosive atmospheres are unlikely during normal operation.
Antenna Configuration
The WL2 option provides a remote Omni-antenna kit with a 50 ft. (15.2 m) cable and lightning arrestor. Remote antenna mounting allows the gateway enclosure to be positioned for convenient wiring access while the antenna is located for optimal radio coverage—typically 4.6 to 7.6 meters (15 to 25 feet) above ground or obstructions. The lightning arrestor protects the gateway from transient voltage surges on the antenna cable.
