The EM-481 provides data collection from connected MODBUS devices, data transmission to a server, access to data (via the MODBUS TCP protocol or SMS text messages), event tracking, and response to events (sending SMS notifications, writing values to MODBUS devices, and saving read values to a log on a memory card).

The EM-481 features:

• Flexible connectivity options (wired or wireless GSM/LTE communication, automatic selection of communication method with the server, automatic or manual detection of GSM service provider and connection parameters, MAC address reassignment, and other Ethernet settings).
• Access protection (password protection for configuration or MODBUS network connection, connection only to a specified server with automatic authorization, SMS control password).
• Various RS-485 exchange modes (RTU or ASCII, parity check options: even, odd, or none, wide range of transmission speeds, configurable delay, MODBUS master and slave modes, tunnel mode for other protocols).
• Programmable data collection, event handling, and event-triggered actions.
• Service functions (real-time clock, firmware update capability).

Key features of the EM-481:

• Reading parameters of connected devices.
• Sending programmable SMS and email notifications.
• Parameter history in graphs.
• Real-time monitoring.
• Remote device control.
• Automatic programmable device control (simplified PLC functionality).
• Programmable device status logging.
• Internet access via GSM (4G) and Ethernet.
• Connection of up to 247 Modbus devices simultaneously.