The DHI‑ARM7011‑W2 is a compact wireless relay designed to control low‑voltage devices from a distance. It integrates with Dahua systems to enable one-channel dry-contact control, while offering secure AES128-encrypted communication, cloud firmware updates, and built-in tamper protection. Perfect for automating gates, lights, or alarms in smart security networks.
Key Features
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Secure Two-Way RF with Frequency Hopping – Ensures reliable control with minimal interference.
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AES128 Encryption & Jamming Detection – Maintains secure signal integrity.
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Dry-Contact Relay (0–36 VDC, 5 A max) – Allows remote switching of external low-voltage loads.
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Overheat & Overvoltage Protection – Safeguards the relay and connected devices.
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Tamper Input – Detects external manipulation and triggers alerts.
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Cloud-Based Firmware Updates – Supports remote updates with automatic recovery from failures.
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Compact & Easy to Mount – Wall-installable at just 39×33×19 mm.
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Wide Power Support – Works with 7–24 VDC supply for flexible installation.
Perfect For:
- Automated gate and garage door control
- Switching lighting circuits remotely
- Activating auxiliary alarms or sirens
- Controlling electric door strikes or magnetic locks
- Integrating HVAC or pump control into security systems
- Remote power management in kiosks or outbuildings
Install Tips
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Check Range Before Mounting – Use test mode to ensure a reliable 800 m link in open space.
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Use Clean Dry-Contact – Ensure your connected device draws ≤5 A and uses 0–36 VDC.
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Wire Alarm Input for Security – Connect to an external tamper switch to notify on casing opening.
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Secure Power Source – Use a stable 12 VDC supply to stay within the supported range.
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Plan for Heat Dissipation – Keep the module cool; avoid enclosed spaces near heat sources.
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Maintain RF Integrity – Install away from large metal objects to maintain strong signal quality.
Downloads
Quick-Read Specs Card
| Spec |
Detail |
| Relay Output |
Dry contact, 0–36 VDC, Max 5 A |
| Alarm Input |
1 (NO/NC, tamper) |
| Power Input |
7–24 VDC |
| RF Frequency |
433.1–434.6 MHz |
| Comm. Range |
Up to 800 m (open space) |
| Encryption |
AES128 with frequency hopping |
| Firmware |
Cloud update, auto-recovery |
| Protection Features |
Overheat & overvoltage |
| Mounting |
Wall mount (39×33×19 mm) |
| Certifications |
CE, FCC |
Extra Info
Secure RF with Jamming Detection
The device utilizes advanced radio frequency (RF) security measures to ensure reliable and uninterrupted communication. Its frequency hopping spread spectrum (FHSS) technology dynamically switches channels within a defined frequency band, significantly reducing the risk of signal interference from nearby wireless devices. In addition, the two-way communication protocol provides confirmation of signal receipt, improving reliability and responsiveness. Importantly, the system includes intelligent jamming detection that can identify attempts to disrupt communication—such as signal flooding or RF jamming—and immediately alert the connected alarm panel or monitoring center, ensuring robust wireless protection even in hostile environments.
Dry Contact Design
This module features an isolated dry contact relay interface, enabling it to switch low-voltage devices—such as sirens, door locks, lighting circuits, or garage door openers—without drawing power or causing electrical interference within the control module itself. Supporting up to 36 VDC, the dry contact design ensures safe and flexible integration with a wide range of third-party systems. Its galvanic isolation also provides added protection against voltage surges or ground loops, helping preserve the longevity of both the relay module and any connected devices.
Tamper Protection
To defend against physical tampering or sabotage, the module is equipped with built-in tamper detection mechanisms. If the enclosure is opened or if the device is forcibly removed from its mounting surface, a tamper signal is instantly sent to the connected alarm panel. This ensures that any unauthorized access attempt triggers an immediate response—such as an alarm, system lockout, or remote alert—providing an additional layer of physical security alongside digital protections.
Auto-Reset Firmware Updates
Firmware updates are delivered through a secure cloud platform or local connection, ensuring the device remains current with the latest features, performance enhancements, and security patches. In the event that a firmware update fails due to power interruption or connectivity issues, the system is designed to automatically detect the failure and revert to the last known stable version. This fail-safe mechanism eliminates the need for manual reprogramming or servicing, reducing downtime and ensuring continued system operation without user intervention.
Overheat & Overvoltage Protection
To prevent damage caused by abnormal electrical conditions, the relay module includes integrated board-level protection circuits. These safety features monitor temperature and voltage levels in real time. If the system detects excessive heat buildup or an overvoltage event, it will automatically shut down the affected relay channels to prevent further risk to the module or the connected load. Once conditions normalize, the system can resume operation, preserving both hardware integrity and system reliability over the long term.
Q&A
Q: Can I use this to switch high-voltage AC loads like 120 VAC?
A: No. It’s designed for low-voltage DC (0–36 VDC, 5 A max). Use a suitable AC-rated relay instead.
Q: Will it alert if someone tamps with it?
A: Yes. The tamper input detects casing removal and can report to the alarm hub.
Q: How far can it communicate?
A: Up to 800 m in open space. Range may be reduced indoors or near obstructions.
Q: What happens if I update firmware and it fails?
A: The module automatically restores the previous firmware—no bricks.
Q: Can it switch lights and alarms simultaneously?
A: It supports one relay output. Use an external diverter or add modules for multiple loads.
Q: Is the relay output dry contact isolated?
A: Yes, the relay contacts are electrically isolated from the module’s power system.
Q: What power input does it need?
A: A 7–24 VDC stable supply. Common installations use 12 VDC.
Q: Does it require a special mounting orientation?
A: No; it can be installed wall-mounted in any orientation.
