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About modbus tcp
Where to Find Modbus TCP Device Suppliers?
China remains a central hub for industrial communication hardware manufacturing, with key supplier clusters in Shenzhen, Chengdu, and Shanghai offering specialized expertise in Modbus TCP-enabled devices. These regions host vertically integrated electronics supply chains, enabling rapid prototyping and scalable production of protocol converters, I/O modules, gateways, and embedded controllers. Shenzhen’s ecosystem excels in wireless integration, supporting hybrid RF-Ethernet solutions, while Chengdu focuses on compact, low-power distributed I/O systems for remote monitoring applications.
Manufacturers in these zones benefit from proximity to semiconductor distributors, PCB fabricators, and firmware development teams, reducing component lead times by 20–35% compared to offshore alternatives. Facilities typically maintain in-house testing labs for protocol compliance validation, including packet error rate analysis and network stress testing under industrial temperature ranges (–40°C to +85°C). Buyers gain access to flexible production models—supporting batch runs as small as 10 units or volume orders exceeding 10,000 pieces—with average delivery cycles of 15–30 days post-confirmation.
How to Choose Modbus TCP Device Suppliers?
Evaluate suppliers using the following technical and operational criteria:
Protocol & Hardware Compliance
Confirm full adherence to Modbus over TCP/IP specification (Modbus Organization v1.1b), including support for standard function codes (e.g., FC3, FC16) and port 502 configuration. Devices should feature auto-negotiating Ethernet interfaces (10/100BASE-TX), isolation protection (≥1.5kV), and compatibility with major SCADA platforms (e.g., Siemens SIMATIC, Rockwell FactoryTalk). For environments with electrical noise, verify galvanic isolation on digital/analog channels and surge protection on RJ45 ports.
Production & Engineering Capacity
Assess core capabilities through verifiable indicators:
- Minimum factory area of 1,000m² with dedicated SMT and DIP assembly lines
- In-house firmware development team capable of customizing slave IDs, polling intervals, and exception handling
- Support for OEM/ODM modifications, including DIN-rail mounting options, extended temperature operation, and dual-network redundancy
Cross-reference online transaction volume and reorder rates to gauge reliability and customer satisfaction.
Quality Assurance & Transaction Security
Prioritize suppliers providing RoHS and CE declarations, along with EMI/EMC test reports (IEC 61000-4 series). Utilize secure payment mechanisms that release funds upon product verification. Conduct sample testing to validate data throughput stability, connection timeout behavior, and accuracy of analog input/output scaling. Request configuration software access to confirm ease of parameterization prior to bulk ordering.
What Are the Best Modbus TCP Device Suppliers?
| Company Name | Main Products | Online Revenue | On-Time Delivery | Response Time | Reorder Rate | Min. Order Quantity | Price Range (USD) |
|---|---|---|---|---|---|---|---|
| Cwt Co., Limited | Modbus TCP I/O Controllers (AI/DI/DO) | US $120,000+ | 93% | ≤10h | 22% | 1 unit | $52–$109 |
| Chengdu Ebyte Electronic Technology Co., Ltd. | Distributed I/O Modules, DTUs | US $770,000+ | 98% | ≤2h | 19% | 1–2 pieces | $29.75–$49.25 |
| Shenzhen Shi Fang Communication Technology Co., Ltd. | Serial-to-Ethernet Converters | US $3,000+ | 83% | ≤2h | 28% | 10 pieces | $50–$95 |
| Shanghai Xinheng Electronics Co., Ltd. | Weight Transmitters, Scale Indicators | US $10,000+ | 100% | ≤2h | <15% | 1 piece/set | $170–$528 |
| Changsha Ztware Iot Technology Co., Ltd. | Modbus Gateways, Relay Modules | US $70,000+ | 100% | ≤7h | 50% | 10 pieces | $16.80–$50 |
Performance Analysis
Changsha Ztware stands out with a 50% reorder rate—the highest among listed suppliers—indicating strong customer retention despite longer response times. The company offers the lowest price point ($16.80) for entry-level Modbus TCP gateways, making it ideal for cost-sensitive IoT deployments. Chengdu Ebyte combines high on-time delivery (98%) with sub-2-hour responsiveness and competitive pricing, positioning it well for time-critical procurement. Cwt Co., Limited provides broad product variety with single-unit MOQs, suitable for pilot testing and small integrations. Shanghai Xinheng specializes in high-end weighing instrumentation with full Modbus TCP integration, though at significantly higher price points. Shenzhen Shi Fang offers mid-tier pricing but requires 10-piece minimums, suggesting focus on project-scale rollouts rather than individual buyers.
FAQs
How to verify Modbus TCP device compatibility?
Request detailed datasheets listing supported function codes, register mapping, MAC/IP configuration methods, and maximum concurrent connections. Test sample units using open-source tools like QModbus or Simply Modbus to validate read/write operations and error handling under network latency.
What is the typical lead time for Modbus TCP devices?
Standard orders ship within 10–15 days after payment confirmation. Custom firmware or mechanical modifications may extend lead times to 25 days. Air freight adds 5–7 days for international delivery.
Can suppliers provide protocol documentation and SDKs?
Leading suppliers offer comprehensive technical packages, including MODBUS map tables, wiring diagrams, and Windows/Linux-compatible configuration utilities. ODM partners often provide source code examples for STM32 or ESP32-based development.
Are samples available for testing?
Most suppliers allow sample purchases at listed prices. Some waive fees if followed by volume orders. Expect to pay full cost for high-value units such as industrial scale transmitters.
Do manufacturers support private labeling?
Yes, many offer white-label services including custom branding, packaging, and UI localization. Minimum thresholds typically start at 100 units, with additional charges for logo engraving or bespoke housing designs.
