Modbus RTU vs Modbus TCP: choosing between RS-485 and Ethernet I/O
How RS-485 and Ethernet I/O differ in cabling, scan time and addressing, how to combine them with gateways, and which ICP DAS series fit.
Applications and know-how
Application guides for ICP DAS I/O, controllers, gateways and meters, sorted by the job they do.
ICP DAS makes the building blocks of measurement and control systems: remote I/O modules, programmable automation controllers (PACs), protocol gateways, power meters, sensors and IIoT edge devices. Most of them use open protocols such as Modbus RTU, Modbus TCP, MQTT and OPC UA, so they combine with each other and with PLCs, SCADA, building management systems and cloud platforms from other vendors.
The pages below are organised by application rather than by product line. Each one describes what a typical system in that area needs, which ICP DAS product groups fit, and what to check before you choose hardware. Articles with worked examples and selection guides are added to each area over time.
How RS-485 and Ethernet I/O differ in cabling, scan time and addressing, how to combine them with gateways, and which ICP DAS series fit.
How a Modbus to BACnet gateway maps registers to BACnet objects, when MS/TP is involved, and which ICP DAS gateway fits each direction.
When new signals can bypass the PLC, when its program has to change, and which Ethernet I/O, fieldbus I/O and gateways fit each case.
How PMC and PMD concentrators poll power meters, log to microSD, resend data after network outages and deliver it over Modbus TCP, MQTT, SNMP or FTP.
How to connect an unmanned site over 4G: outgoing connections or VPN, power, alarms, buffering when offline, and which ICP DAS devices fit.
How MQTT and OPC UA differ in communication model, data description and security, and which ICP DAS devices support each protocol.
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