ICP DAS HRT-711 is a compact Modbus TCP/UDP to HART gateway that enables Modbus TCP/UDP master devices to access HART slave devices — including transmitters, actuators, and current output devices — over standard Ethernet. Supporting up to 15 HART devices per channel in point-to-point or multi-drop topology, HART burst mode, online device replacement, and automatic long frame address acquisition, the HRT-711 integrates HART field instruments into Ethernet-based Modbus networks with minimal effort.
ICP DAS HRT-711 is a DIN-rail mounted Modbus TCP/UDP to HART protocol gateway designed to bridge Ethernet-based Modbus control systems with HART field instruments. As a HART master, the HRT-711 enables any Modbus TCP/UDP master — including SCADA systems, PLCs, PACs, and HMIs with Ethernet ports — to communicate with HART slave devices such as flow transmitters, pressure sensors, temperature transmitters, valve positioners, and 4–20 mA current output devices, without requiring serial port adapters or additional converters.
The HRT-711 connects to the host system via a standard RJ-45 Ethernet port supporting 10/100 Base-TX with auto-negotiation and auto-MDIX, enabling direct connection to any Ethernet switch or hub using standard Cat5 cables. A separate RS-232 port (COM1, 9-pin screwed terminal) is provided for local configuration via utility software without affecting the main Ethernet communication channel.
The single HART channel supports up to 15 HART slave devices in multi-drop topology or a single device in point-to-point mode, accommodating both 2-wired and 4-wired HART device configurations. HART burst mode is supported for continuous data broadcasting without polling, improving data freshness for time-critical process monitoring. Two HART masters can share the same HART network simultaneously — allowing a handheld HART communicator to coexist with the HRT-711 for on-site commissioning and maintenance without disrupting normal operation.
Two advanced features further enhance operational flexibility: online replacement of HART devices allows field instruments to be swapped without taking the gateway offline, minimizing process disruption during maintenance; and automatic long frame address acquisition eliminates the need for manual HART address configuration when adding new devices to the network. A built-in 250 Ω loop resistor (selectable via jumper) removes the need for an external resistor in standard 4–20 mA HART installations.
Firmware updates are supported via the COM port, enabling field upgrades without returning the unit to the factory. ESD protection of 4 kV class A and hardware watchdog IC ensure robust, continuous operation in electrically demanding environments. The HRT-711-UTA variant extends the operating temperature range to -40°C for extreme cold environment applications.
