Description
Otis Elevator RS14 Communication Board GDA25005B1 Brief Introduction
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Product Name |
Otis Elevator RS14 Communication Board |
| Model Number |
GDA25005B1/DAA25005C1 |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Otis RS14 Communication Board GDA25005B1 – Reliable Data Bridge for Otis Elevator Networks | Nanjing Zhuye Elevator Parts
Inside every modern Otis controller, dozens of PCBs must speak the same language—calls, positions, speeds, faults—without a single lost byte. The RS14 Communication Board GDA25005B1 is that multilingual interpreter. It converts parallel logic signals into robust RS-485 frames, routes them between the car-top LCE box, the COP, the V3F drive and the building’s BMS, and keeps talking even when electrical noise surges down the shaft. When it falls silent, the whole group can freeze and passengers start pressing every button in sight. Nanjing Zhuye Elevator Parts keeps genuine GDA25005B1 units in anti-static packaging, pre-flashed with the latest firmware and ready for same-day despatch—helping you restore crystal-clear conversation without costly OEM delays.
Product snapshot
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Otis part number GDA25005B1, hardware rev. B1, firmware RS14-3.4
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2 × isolated RS-485 ports, 115.2 kbit/s, 32-node capacity, 1.5 kV surge protection
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1 × RS-232 service port for laptop or Otis diagnostic tool (ODT)
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8 × digital I/O (24 V DC) for direction, ready, fault, test-mode flags
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Galvanically isolated 24 V DC supply, 80 mA, reverse-polarity protected
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On-board terminating resistors (120 Ω) software-selectable, fail-safe relay output
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ARM Cortex-M0+ MCU, 256 kB flash, 32 kB EEPROM for message buffering
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Operating temperature −10 °C to +70 °C, conformal-coated both sides, UL 94-V0
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IP20 plastic housing, 120 × 80 × 25 mm, 0.18 kg, DIN-rail or screw mount
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CE, UL, RoHS, REACH and Otis QES 2024 approved
Where it works
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Otis Gen2®, Gen2® Switch, 4200/5200 high-speed lifts in single or group installations
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Modernisation packages adding BMS, remote monitor or voice annunciation interfaces
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Any controller needing noise-immune RS-485 links between car-top, COP and drive
Installation method – 10-minute plug-and-talk
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Place lift on inspection mode; switch OFF main breaker; lock & tag.
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Wait 3 min for DC bus to discharge; verify zero energy.
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Photograph existing wiring; note RS-485 polarity and terminating jumpers.
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Release DIN-rail clip; slide old GDA25005B1 upwards and out.
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Clip new board onto TS-35 rail until latch clicks.
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Re-connect 24 V DC (red +, black −), RS-485 A/B, I/O flags, shield drain to PE.
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Set terminating jumper JP1 = ON if board is at cable end; OFF if mid-span.
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Power up; green “RUN” LED must illuminate within 2 s, “TX/RX” LED flashes with traffic.
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Launch Otis Diagnostic Tool (ODT-3.4); verify baud-rate 115.2 k, error count = 0.
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Run 10 cycles; check car-to-drive messages < 1 % error rate; log serial number.
Replacement cycle & preventive maintenance
Although fan-less, capacitors and opto-couplers age. Otis bulletin SB-COM-2024-02 recommends:
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Visual inspection every 6 months: check for vent blockage, swollen caps, loose terminals.
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Bus test every 12 months: oscilloscope jitter < 50 mV, error frames < 0.1 %.
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Replace entire board every 10 years or 87 600 operating hours (24 h × 365 × 10).
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Immediate replacement if:
– “RUN” LED off while 24 V present,
– error count > 5 % or messages time-out,
– isolation resistance < 1 MΩ between RS-485 and 24 V,
– temperature > 70 °C on IR camera (vent blocked).
Pro tip: 70 % of premature failures are traced to loose RS-485 terminals—re-torque to 0.5 Nm every year.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use twisted-pair RS-485 cable, shield grounded at one end only, to prevent ground loops.
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Never mount sideways without 10 mm spacing—convection needs vertical airflow.
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Keep a spare GDA25005B1 in every service van; at 0.18 kg it costs less than one callback.
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After lightning storm, check surge arrester MOV; a blown MOV can drop bus voltage and cause errors.
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Order the “RS14 Bundle” (board + DIN-rail clip + terminating resistor) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are an Otis-authorised distributor, importing GDA25005B1 directly from the Czech factory, ageing every unit for 2 h at 60 °C and shipping with a 24-month replacement warranty. Stock is stored in humidity-controlled bins to prevent capacitor ageing. Orders placed before 15:00 China time leave the same evening via DHL Express, arriving Europe or North America in 2–4 days. Bulk pricing starts at ten pieces; we can pre-wire ferrules and include a loaner unit to keep your controllers talking during the swap.
Conclusion
The GDA25005B1 RS14 Communication Board is the silent interpreter that keeps every Otis controller speaking the same language. By installing the genuine unit, following the wiring schedule and replacing it before capacitors age, you eliminate mysterious time-outs, group faults and costly passenger entrapments. Stock genuine GDA25005B1 from Nanjing Zhuye Elevator Parts today—because when the data stops, the whole lift stops.
