RS-232 interface module ARF8240 series

USBRS-485Modbus

Overview
The MODBUS IoT sensor interrogates one or multiple Modbus slaves via MODBUS RTU and forwards their data over an LPWAN network (LoRaWAN). It supports local and remote configuration and provides power control to the sensor.

Highlights of the IoT sensor

• RS485/RS232 compatible
• Supervision of up to 20 Modbus slaves
• Multiple periodic frames with configurable frequencies (up to 6)
• Installation indicator lights
• Control and supply of power to connected sensor
• Local (USB-C) and remote configuration
• Compatible with KARE device-management services
• Available regional LoRaWAN versions: EU863-870, US902-928, AS923-1

What actions are carried out by the connected sensor?

• Alert: Report faults and alerts from Modbus slaves to the network
• Act: Read and write registers on a slave from the network
• Measure: Collect measurement data and feedback on faults/alerts from slaves

Operating modes & configuration

• Periodic or event-driven operation
• Up to 6 configurable periodic frames; configurable life-screen
• Modbus-specific assistance in the IoT Configurator
• Product error, configuration error and low battery alerts
• Pre-wired with 2 cables (2 wires) plus 6 connectable wires
• Configuration local via USB-C or remote via the network

Mechanical & environmental

• Dimensions: 105 x 50 x 27 mm
• Enclosure: IP67
• Integrated fastening: DIN rail, tube, wall mount, flange
• Recommended operating range: -25°C to +70°C
• Humidity: 0–85% RH (non-condensing)
• Power supply: external 6–30 V DC

Decoding
Device decoding is supported; the manufacturer provides a CODEC for payload interpretation.

Datasheets
Official datasheets and region-specific documentation are available for this product.

Technical specifications

• Protocol: MODBUS RTU
• Interfaces: RS485 / RS232
• Supervision: up to 20 Modbus slaves
• Operating modes: periodic or event-driven (LoRaWAN Class A/C selectable)
• Frames: up to 6 configurable periodic frames; life-screen configurable; alarm repeat intervals
• Indicators: installation LEDs
• Power: external 6–30 V DC
• Dimensions & enclosure: 105 x 50 x 27 mm; IP67 (IP68 on request)
• Mounting: DIN rail, tube, wall mount, flange
• Environmental: -25°C to +70°C; 0–85% RH non-condensing
• LoRaWAN regional versions: EU863-870, US902-928, AS923-1
• Certifications: Directive 2014/53/EU (RED); US/Canada and region-specific certifications where applicable
• Part numbers (by region): ARF8240AA (EU), ARF8240BA (US), ARF8240J (AS923)