Modbus I/O Module
SfAR-1M-4DO gives users a possibility to send multiple signals to multiple devices, for example, to start/stop or alarm reset commands for pumps.

4 Digital Outputs
The module has 4 digital outputs (DO). Digital outputs are PNP transistor outputs sending voltage signals. All outputs are isolated from the logic with optoisolators.

Simplified Configuration and Commissioning Process
A built-in RS485 interface allows an easy connection over the Modbus RTU/ASCII protocol. A 32-bit ARM core processor provides fast processing and communication.
The module is equipped with a set of LEDs used to indicate the status of I/Os, power supply, and RS485 communication.
Configuration of the module is carried out with our free software, the SfAR Configurator. A built-in mini USB allows for performing a primary configuration of the unit without an additional power supply.

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Technical Specification

Hardware Specification
RS485 interface
mini USB type B interface
Status LED indicators
DIN rail mounted

Outputs
4 Digital Outputs (DO)
PNP
55 V DC, 250 mA
Opto-isolated from RS485 and power supply

Communication
Modbus RTU/ASCII
Free software - SfAR Configurator

Power Supply
10-38 V DC ± 20%
10-28 V AC ± 20%