English Product Name
| Brand | TCT (Xiamen Tongchuang) |
|---|---|
| Origin | Fujian, China |
| Model | NRPT700(H) |
| Type | Fixed-mount online telematics unit |
| Detection Principle | CAN-bus-based emission data acquisition and OBD-II/EOBD-compliant diagnostic protocol parsing |
| Communication | LTE-FDD/TDD (B1/B3/B5/B8/B38/B39/B40/B41), WCDMA, TD-SCDMA, CDMA, GSM |
| Positioning | GPS & BeiDou dual-mode, sensitivity −162 dBm, horizontal accuracy ≤10 m (open sky), cold start <38 s |
| Environmental Rating | IP67 |
| Operating Temperature | −30 °C to +75 °C |
| Storage Temperature | −40 °C to +85 °C |
| Humidity | 5–95% RH (non-condensing) |
| Power Supply | DC 9–36 V |
| Standby Current | ≤1 mA @ 24 VDC |
| Average Operating Current | ≤55 mA @ 24 VDC |
| Backup Battery Runtime | ≥1 h |
| Compliance | HJ 1014–2018, HJ 1322–2023, GB 20891–2014, GB 17691, GB 32960, DB11/1476, DB11/122 |
| Protocols | SAE J1939, ISO 15765, ISO 27145 (WWH-OBD), ISO 14229 (UDS), ISO 15031 |
| Interfaces | 1–2× CAN, 1× K-Line, 1× L-Line, 1× RS232, 40-pin expansion header |
| Security | CC EAL5+, GM/T 0028–2014 Level 2, AES/DES/SM1/SM2/SM4 support |
Overview
The TCT NRPT700(H) is an industrial-grade telematics control unit engineered specifically for regulatory compliance monitoring of off-road mobile machinery (ORMM) under China’s national and provincial emission management frameworks. Unlike conventional gas analyzers or portable exhaust testers, the NRPT700(H) operates as a networked edge device that interfaces directly with the vehicle’s electronic control unit (ECU) via high-speed automotive serial buses. Its core function is not real-time gas concentration measurement, but rather standardized acquisition, validation, and secure transmission of engine operational parameters—including torque, speed, fuel rate, aftertreatment status, diagnostic trouble codes (DTCs), MIL illumination state, and emission-related readiness monitors—as defined in HJ 1014–2018 and HJ 1322–2023. The unit implements a dual-core automotive-grade SoC architecture, enabling deterministic execution of multi-protocol stack parsing (SAE J1939, ISO 27145, UDS) while maintaining robustness across extreme thermal gradients (−30 °C to +75 °C) and electromagnetic noise environments typical of construction, agricultural, and material handling equipment. It serves as the primary data acquisition node in centralized fleet-level emission surveillance systems mandated by local生态环境 bureaus.
Key Features
- Multi-constellation GNSS positioning (GPS + BeiDou) with −162 dBm sensitivity and ≤10 m CEP accuracy under open-sky conditions
- Redundant communication capability via LTE-FDD/TDD (Cat 4), WCDMA, TD-SCDMA, CDMA, and GSM—ensuring nationwide coverage across China’s heterogeneous telecom infrastructure
- Hardware-accelerated cryptographic module certified to CC EAL5+ and Chinese National Cryptography Administration Level 2 standards, supporting SM2/SM4/SM1, AES-128/256, and DES encryption for secure OTA updates and data-in-transit protection
- Dual CAN bus channels compliant with ISO 11898-2, plus legacy K-Line and L-Line interfaces for backward compatibility with older ORMM ECUs
- IP67-rated enclosure with reinforced gasketing and conformal coating, validated for continuous operation in high-dust, high-humidity, and vibration-intensive deployment scenarios
- Configurable reporting intervals (default 10 s), offline data buffering with >128 MB internal flash, and blind-zone data recovery upon network reconnection
- Remote diagnostics, firmware over-the-air (FOTA) upgrades, and configurable removal/tamper alerts aligned with GB 32960 telemetry security requirements
Sample Compatibility & Compliance
The NRPT700(H) is designed for integration into diesel-powered off-road mobile machinery—including excavators, wheel loaders, bulldozers, graders, cranes, and agricultural tractors—equipped with CAN-based engine control systems meeting GB 17691 Stage IV/V or equivalent emission standards. It supports both heavy-duty (SAE J1939) and light-duty (ISO 15031, ISO 14229) diagnostic protocols, enabling interoperability with OEM-specific ECU implementations. Regulatory alignment includes mandatory conformance with HJ 1014–2018 (Technical Specification for Remote Emission Monitoring of Non-Road Mobile Machinery), HJ 1322–2023 (Data Transmission Protocol for Non-Road Machinery Telematics), GB 20891–2014 (Emission Limits for Diesel Engines), and regional standards such as DB11/1476 (Beijing Local Standard for Non-Road Machinery Emission Control). All firmware logic and data structures are auditable for GLP-aligned traceability, and event logs include immutable timestamps, digital signatures, and cryptographic hash chaining per GB 32960 Annex B.
Software & Data Management
The NRPT700(H) communicates exclusively via standardized JSON/XML payloads formatted according to HJ 1322–2023 Annex A. Data streams include engine runtime metrics (RPM, load %, coolant temperature), aftertreatment status (DPF soot mass, SCR urea dosing), diagnostic flags (MIL, pending DTCs, freeze frame data), and geospatial metadata (latitude, longitude, altitude, velocity, HDOP). Firmware supports TLS 1.2 encrypted transport, certificate-based mutual authentication, and configurable payload compression. Local storage retains up to 30 days of buffered telemetry at default 10 s intervals. The unit provides a RESTful API interface via its RS232 port for integration with third-party fleet management platforms and supports Modbus RTU bridging for SCADA-level supervision. Audit trails comply with basic principles of FDA 21 CFR Part 11 for electronic records, including user action logging, timestamp integrity, and write-once-read-many (WORM) archive modes.
Applications
- Real-time compliance verification for municipal non-road machinery registration and annual inspection programs
- Fleet-level emissions performance benchmarking across construction contractors operating under low-emission zones (LEZs)
- Remote fault root-cause analysis for OEM technical service centers using standardized UDS diagnostic sessions
- Integration into provincial environmental big-data platforms for spatial-temporal emission hotspot mapping
- Supporting government-led retrofit verification programs for legacy machinery equipped with DPF/SCR add-ons
- Enabling dynamic duty-cycle profiling for lifecycle emission modeling under GB/T 32960–2016
FAQ
Does the NRPT700(H) perform direct NOx or PM concentration measurements?
No. It is a regulatory telematics unit—not a gas analyzer. It acquires emission-relevant control signals and diagnostic states from the ECU; external PM/NOx sensors may be connected via analog or CAN, but are not included with the base unit.
Is the device certified for use outside mainland China?
The NRPT700(H) complies with Chinese national and local environmental regulations (HJ/GB/DB series) and is optimized for China’s 4G/LTE spectrum allocation and BeiDou positioning infrastructure. Export deployment requires protocol adaptation and regional certification.
Can it interface with third-party cloud platforms?
Yes—via configurable HTTP(S) POST endpoints and HJ 1322–2023–compliant payload schema. Custom MQTT or TCP socket integration is supported through the RS232 interface with OEM-provided SDK.
What happens during extended network outages?
All telemetry is stored locally in non-volatile flash memory and automatically retransmitted upon network restoration, with sequence-numbered payloads to prevent duplication or gaps.
How is firmware integrity verified during remote updates?
Each OTA package is signed with the manufacturer’s private key and validated using embedded public-key cryptography prior to flashing; rollback protection prevents downgrade to unverified versions.
