Development Scope
Serial port and communication hardware
Design the transceiver, level conversion, isolation and protection circuit according to the UART, RS-232 or RS-485 interface, and complete the integration of main controller, module, power supply and antenna based on the installation conditions.
Data transparent transmission and connection management
Develop serial port transceiver buffering, packetization, TCP/UDP connections, heartbeats, disconnection detection and reconnection, and clarify message boundaries and data processing when links are abnormal.
Parameter configuration and operation and maintenance
Develop baud rate, serial port format, server address and APN configuration, and add configuration verification, log, version query and controlled reset functions.
Business system access
Connect to the existing server of the enterprise; when it is necessary to parse the instrument protocol, add register or message parsing, field conversion and MQTT/HTTPS interface.
Data and Operational Workflow
Field device serial port output → DTU reception and subcontracting → 4G data connection → Enterprise server reception → Business system analysis and display. Downstream data is returned to the device according to permissions and protocols, and delivery and execution status are confirmed according to business requirements.
The transparent transmission project retains the original device messages; the protocol conversion project requires clear fields, units, addresses, and read and write permissions. Offline cache capacity, retransmission and deduplication methods are determined by the data frequency and server processing mechanism.
Project Inputs
- Device interfaces, levels, wiring diagrams, serial port parameters and original message samples.
- Server protocol, access address, authentication method and test environment.
- Deployment area, operator, SIM/APN, power supply and installation structure.
- Data volume, uplink and downlink frequency, maximum allowed offline time and remote configuration requirements.
Deliverables and Acceptance
| Deliverables | Delivery content | Verification method |
|---|---|---|
| Communication hardware | Schematic diagrams, PCB, BOM, production files and prototypes within the agreed range | Check the interface level, wiring, power supply waveform and continuous transmission and reception of the target serial port. |
| Firmware and interface | Transparent transmission program, configuration tools, interface description and construction environment | Verify the sending and receiving content and message boundaries according to the agreed message length, sending frequency and concurrent connections. |
| Integration testing and test records | Device version, network parameters, original messages and fault records | Test behavior and recovery after network disconnection, server interruption, no card, power outage and configuration errors. |
The source code, design files, number of prototypes and maintenance scope are listed in the project brief. The acceptance criteria are defined separately when the data arrives at the server and when the on-site equipment is executed, and the traffic flow, cloud resources and on-site construction costs are confirmed separately.
Frequently Asked Questions
What is the difference between DTU transparent transmission and protocol gateway?+
DTU transparent transmission mainly handles data handling and connection management, and the server still needs to understand the original message. The protocol gateway parses registers or business fields on the device side and then maps them into platform messages. When collection polling, data conversion or local rules need to be completed at the edge, the protocol gateway solution can be used.
Can I directly add 4G to an existing RS-485 device?+
You can first evaluate the way to connect an external DTU, but you need to check the interface, power supply, bus role and server protocol. If the device uses master-slave polling, it must be clear whether the server initiates the query or the terminal polls locally, and then determines the implementation of transparent transmission or protocol conversion.
How are development costs determined?+
Split the workload after evaluating the existing hardware and code, the number of serial ports, whether to parse business protocols, server interfaces and exception recovery requirements. Communication boards, firmware, configuration tools, platform interfaces, prototypes and tests are listed separately, and the delivery materials at each stage are clarified.
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