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QD-6711 Intrinsically Safe RS485 Signal Isolator Barrier

An intrinsically safe RS485 isolator barrier with three-port 2500VAC isolation, auto baud-rate adaptation, and a slim 12.5mm DIN-rail design for reliable hazardous-area communication.
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QD-6711 Intrinsically Safe RS485 Isolator Barrier

QD-6711 RS485 intrinsic safety barrier isolating communication between hazardous and safe areas

Intrinsically Safe RS485 Communication Isolation

QD-6711 is a rs485 isolated safety barrier designed around “Intrinsically Safe RS485 Communication Isolation.” Separates the hazardous-area RS485 communication loop from the safe-side control system. The isolated signal path separates the hazardous-area device from the safe-side control system and helps limit unwanted electrical interaction across the barrier. The confirmed values highlighted here are RS485. The feature is directly relevant to hazardous-area instrument loop, control cabinet and industrial process projects. Protect hazardous-area loops while keeping safe-side data stable, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

QD-6711 RS485 isolator barrier with interference resistance for stable industrial communication

Strong Anti-interference for Stable RS485 Communication

QD-6711 is a rs485 isolated safety barrier designed around “Strong Anti-interference for Stable RS485 Communication.” Suppresses field interference to keep RS485 communication stable between hazardous and safe areas. The stated operating range, accuracy, response, overload or stability feature supports more dependable data under changing field conditions. The confirmed values highlighted here are RS485. The feature is directly relevant to hazardous-area instrument loop, control cabinet and industrial process projects. Maintain stable rs485 data in electrically noisy industrial sites, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

QD-6711 low-power RS485 isolator barrier for continuous control cabinet operation

Low-power Core Design for Continuous Operation

QD-6711 is a rs485 isolated safety barrier designed around “Low-power Core Design for Continuous Operation.” Reduces module power demand for long-term continuous operation inside automation cabinets. The stated operating range, accuracy, response, overload or stability feature supports more dependable data under changing field conditions. The feature is directly relevant to hazardous-area instrument loop, control cabinet and industrial process projects. Reduce cabinet heat and power demand during continuous operation, helping engineers keep the installation, inspection and signal path easier to manage during long-term operation.

Working Principle Diagram

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Technical Specifications

Transmission Baud Rate Range:300 bps ~ 115.2 kbps, fully auto-adaptive


Maximum Transmission Distance:1200 m @ 9600 bps (standard twisted pair cable)


Bus Node Driving Capacity:Up to 32 standard RS485 slave devices per port


Signal Transmission Bit Error Rate:≤ 10⁻¹² (full load, 25℃ reference ambient)


Common-mode Input Voltage Range:-7 V ~ +12 V (effectively tolerates on-site ground potential difference)


Differential Output Voltage Amplitude:≥ 1.5 V (maintained under full load condition)


Interface ESD Protection:±15 kV contact / ±25 kV air discharge (IEC 61000-4-2)


Interface Surge Immunity:±2 kV differential & common mode (IEC 61000-4-5)


Common Mode Rejection Ratio (CMRR):≥ 120 dB @ 50/60 Hz


Normal Mode Rejection Ratio (NMRR):≥ 60 dB @ 50/60 Hz

Dimension Chart

Width x Height x Length: 12.7 mm x 115.7 mm x 119.3 mm

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Wiring Diagram

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