Question 1

Do you have to be a developer to set up Modbus data collection?

Accepted Answer

No. Configuration is done through a no-code interface in the Eziwan dashboard. You can visually configure the Modbus slaves (address, registers, polling rate) without writing a single line of code.

Question 2

Is it possible to collect data from multiple RS-485 buses simultaneously?

Accepted Answer

Yes. The Eziwan gateway has several physical RS-485 ports. Each port can have its own Modbus RTU bus with different slaves, different baud rates, and independent polling.

Question 3

How is data stored and transmitted?

Accepted Answer

The gateway stores data locally (in an onboard buffer) in the event of a connectivity outage. When connectivity is restored, the data is sent with precise timestamps. No measurement data is lost, even in areas with poor coverage.

Question 4

What is the maximum polling frequency?

Accepted Answer

From 1 second to 1 hour, configurable per register. For rapid measurements (process), 5 seconds. For energy meters, 15 minutes or 1 hour. The history is retained for 90 days (configurable according to the plan).

Question 5

How do I integrate the data into my SCADA or ERP system?

Accepted Answer

Via REST API (pull) or webhooks (real-time push). Eziwan supports MQTT for real-time integrations, and a comprehensive REST API with Bearer authentication for SCADA, Ignition, and InductiveAutomation integrations.

Question 6

What is the maximum length for an RS-485 bus?

Accepted Answer

The RS-485 standard supports distances of up to 1,200 m at 9,600 bps, or 100 m at 1 Mbps. For long-distance industrial installations (warehouses, large buildings), RS-485 repeaters can extend the range. The Eziwan gateway uses industrial-grade RS-485 transceivers with protection against power surges and short circuits.

Question 7

Can Modbus registers be read while they are being written to (remote control)?

Accepted Answer

Yes. The Eziwan gateway supports the following Modbus write functions: FC05 (Write Single Coil), FC06 (Write Single Register), FC15 (Write Multiple Coils), and FC16 (Write Multiple Registers). Write commands can be triggered from the cloud platform, via the REST API, or automatically based on configured rules (e.g., start the pump when the level exceeds 80%).

Question 8

How many Modbus devices can be connected to a single gateway?

Accepted Answer

With Modbus RTU over RS-485, up to 32 slave devices per bus (addresses 1 through 247). With Modbus TCP over Ethernet, the number is limited by network capacity—typically 50 to 100 devices in sequential polling. If you have more devices, multiple gateways can be configured and consolidated into the same cloud dashboard.

Question 9

Is the gateway compatible with the Modbus ASCII protocol?

Accepted Answer

Yes. In addition to Modbus RTU (binary), the Eziwan gateway supports Modbus ASCII for older devices that use this text-based format. Configuration is done in the web interface by selecting the communication mode. Modbus RTU is recommended for new installations (more bandwidth-efficient), but Modbus ASCII is supported for backward compatibility.

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