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Leon Zhang sales consultant
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Email: zxl635973785@gmail.com
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Phone/WhatsApp: +86 13655813266
Intelligent Communication Management Unit | RTU ASM81H
The ASM-81H Communication Management Unit is an essential part of substation integrated automation system, applicable to 110kV and below substations.
Communication Mode:Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 ,IEC 61850
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Description
Overview of Communication Management Unit
- The ASM-81H Communication Management Unit is an essential part of substation integrated automation system, applicable to 110kV and below substations.
- It mainly collects on-site data of the entire power distribution automation system and transmits it to local background system or remote dispatching master station. Meanwhile, it forwards commands from background and master station to various measurement and control devices to realize local and remote control.
- It supports data interaction with bay-level devices, protocol conversion, central signal processing and other functions.
Main Functions of RTU
This device receives protection data, remote signaling, remote measuring values and electric energy data uploaded from all functional modules, and forwards remote commands including time synchronization, remote control, remote regulation, parameter setting and fault wave recording issued by dispatching terminals.
- Build and manage communication links with all types of microcomputer protection devices;
- Realize data transmission with measuring & control equipment and smart power meters;
- Support connection with substation intelligent auxiliary facilities such as DC power supply systems;
- Achieve stable communication interaction with substation host computer systems;
- Complete remote telecontrol data transmission and docking with centralized control centers, fully matching Modbus-RTU communication rules;
- Real-time monitor and check the online communication status of all connected equipment and devices;
- Support remote parameter configuration and daily equipment maintenance via network communication.
Main Features
- Equipped with high-performance 32-bit ARM main control processor with maximum operating frequency up to 72MHz, the advanced hardware platform ensures outstanding data processing and protocol parsing capability.
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It is configured with up to 6 Ethernet ports, 6 CAN interfaces and 24 RS-232/RS-485 serial ports to meet multi-device access demands.
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It supports flexible and diversified protocol processing modes, which can be connected with radio stations, power line carrier equipment to realize synchronous and asynchronous communication at different baud rates. It is compatible with IEC61850, CDT, 1801, 101, 104, 103 and widely-used Modbus-RTU protocols, realizing seamless docking with various RTU unit devices.
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Adopting industrial-grade reliable design, it optimizes internal components and connector structure, owning strong shock resistance and vibration resistance. It can work steadily under severe electromagnetic interference environments with working temperature ranging from -25℃ to +60℃. All indexes including insulation withstand voltage and anti-interference performance fully conform to IEC international standards.
Communication Management Unit – Main Technical Parameters
Electrical Parameters
- Power Supply: AC/DC 220V (110V optional, please specify when ordering)
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Working Frequency: 50 Hz
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Total Power Consumption: ≤ 8 W
Communication Ports
Ethernet Interface
- Quantity: 1~6 channels
- Transmission Rate: 10/100 Mbps
- Transmission Medium: Standard 8-core twisted-pair cable
- Supported Protocols: All TCP/IP-based communication protocols
Serial Communication Interface
- Quantity: 4~24 channels
- Communication Mode: RS232 / RS485
- Baud Rate: 300bps, 600bps, 1200bps, 2400bps, 4800bps, 9600bps
- Transmission Medium: Shielded twisted-pair cable
- Supported Protocols: Various serial communication protocols including Modbus-RTU
System Access Capacity
- Max Accessible Equipment Quantity: ≤ 128
- setsSingle Device Data Capacity
- Remote measuring points: ≤ 64
- Remote signaling & remote control points: ≤ 128
- Remote regulation points: ≤ 8
- Electric energy metering points: ≤ 16
- SOE event storage: ≤ 128 records
- Protection event storage: ≤ 128 records
- Data forwarding channels: ≤ 3 channels (customizable on demand)
- Single channel forwarding data points: Custom configurable, general standard ≤ 2048 points
FAQ
Q:what is rtu remote terminal unit?
A:The RTU transmission unit is the core module within an RTU (Remote Terminal Unit) responsible for data communication. It transmits telemetry and telecontrol data collected on-site to the dispatch master station via channels such as 4G, 5G, Ethernet, or fiber optics, while simultaneously receiving downlink remote control and remote adjustment commands. Essentially, an RTU combines “data acquisition, control, and transmission” into a single unit. If only pure transparent transmission is required, a DTU (Data Transmission Unit) should be selected; the two are often confused but serve different purposes.
Q: What is RTU?
A: Remote Terminal Unit, front-end acquisition device for SCADA. It collects field data, executes remote commands, and transmits data to the central monitoring master station, widely used in substations and distribution networks.
Q: What are the 4 core functions?
A:
- Telemetry (AI): Collect voltage, current, power and other analog data
- Telesignaling (DI): Upload breaker status and protection alarm signals
- Telecontrol (DO): Receive commands to switch on/off switches
- Sequence of Events (SOE): Record fault action timestamps for accident analysis
Q: RTU vs DTU / FTU / TTU
A:
- RTU: Substation central data collection
- FTU: Feeder line monitoring
- DTU: Only transparent data transmission without local I/O
- TTU: Specialized for distribution transformer monitoring
Q: Where is RTU applied?
A: Unattended substations, switching stations, PV/wind booster stations and remote industrial monitoring sites.
Q: Why choose modular RTU?
A: Supports incremental expansion; only replace faulty modules instead of the whole unit, lowering maintenance costs. Reserve 20%~30% spare I/O during ordering.
Q: Main communication protocols
A: IEC101 / IEC104, IEC61850, DNP3, Modbus TCP/RTU. Common interfaces: RS485, Ethernet, optional fiber / 4G/5G.
Q: Power supply & environment
A: Standard 110/220VDC or 85~265VAC. Operating temperature: -40℃ ~ +70℃, with lightning and EMC interference resistance.
Q: Basic commissioning steps
A: Set addresses and protocols → Simulate single-point testing → Verify master station remote control → Backup configuration files. It supports offline data caching and automatic backfilling after communication recovery.
Q: Master station shows offline
A: Check power supply, wiring polarity, IP/address matching and upper network links.
Q: Random false DI signals
A: Tighten wiring, use shielded cables, enable software signal filtering.
Q: Remote control fails to act
A: Check external control power, RTU remote control permission and point table correspondence.
Q: Can RTU run local logic independently?
A: Yes. It supports preset interlock, backup power auto-switching and over-limit interlock even when disconnected from the master station.
Q: Routine maintenance items
A: Check terminals and power quarterly; test redundant communication semi-annually; back up configuration and calibrate channels yearly.
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Stable performance, reliable design, ensuring safe operation for power system protection and grid stability.
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Best Warranty
Professional Warranty: Reliable after-sales support for stable relay protection and long-term customer satisfaction.
xiao zhang –
As substation automation data hub, the communication management unit collects device data, converts multi-protocol and uploads to master station. Rich interfaces and strong anti-interference fit PV, wind and conventional substations.
Jack –
Firmware update is straightforward, no unexpected issues.