--- title: "How Does WittelB WIN-CN-1M-1TCP Use W5500 to Connect Modbus RS485 Devices?" url: "https://maker.wiznet.io/Benjamin/resellers/how-does-wittelb-win-cn-1m-1tcp-use-w5500-to-connect-modbus-rs485-devices/" markdown_url: "https://maker.wiznet.io/Benjamin/resellers/how-does-wittelb-win-cn-1m-1tcp-use-w5500-to-connect-modbus-rs485-devices/md" type: "VAR: Value-Added Reseller Products" author: "Augmatic Technologies Private Limited (WittelB)" author_url: "https://wittelb.com/product/io-module-product-code-win-cn-1m-1tcp/" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "Augmatic Technologies Private Limited (WittelB)" original_url: "https://wittelb.com/product/io-module-product-code-win-cn-1m-1tcp/" published: "2026-11-09" language: "en" tags: ["W5500", "Modbus"] hardware: ["WIZnet W5500"] likes: 0 views: 10 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # How Does WittelB WIN-CN-1M-1TCP Use W5500 to Connect Modbus RS485 Devices? > WittelB turns Modbus RS485 devices into Ethernet endpoints with W5500, DIN-rail packaging and a local interface for configuration and register checks. Original author: Augmatic Technologies Private Limited (WittelB) (source: https://wittelb.com/product/io-module-product-code-win-cn-1m-1tcp/) ## Components - **WIZnet W5500** x 1: Visible on the assembled converter PCB in page 8 of the current manufacturer datasheet. ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500)) WIZnet parts: W5500 ([Datasheet](https://docs.wiznet.io/Product/Chip/Ethernet/W5500/datasheet?utm_source=maker&utm_medium=project&utm_campaign=w5500), [product hub](https://maker.wiznet.io/products/w5500/)) ## Documents and links - [WIN-CN-1M-1TCP product and quotation](https://wittelb.com/product/io-module-product-code-win-cn-1m-1tcp/) (code): Official SKU CN-4001, finished enclosure, quote route and warranty. - [Current WIN-CN-1M-1TCP datasheet](https://wittelb.com/wp-content/uploads/2026/03/Wittelb-WIN-CN-1M-1TCP-1-3.pdf) (schematics): Current exact-model manual. W5500 board photo on page 8 and local configuration workflow. - [WittelB company and team](https://wittelb.com/about-us/): Manufacturer identity, services, founder and location in Vadodara, India. - [WIN-CN-M-2AO analog-output converter](https://wittelb.com/product/io-module-product-code-win-cn-m-2ao/): Related catalog product converts Modbus RTU to 4–20 mA output. - [WIN-MD-W5500 SPI Ethernet module](https://wittelb.com/product/win-md-w5500-ethernet-module/): Separate component-level W5500 product for a customer host circuit. - [W5500 official documentation](https://docs.wiznet.io/Product/Chip/Ethernet/W5500): Ethernet-controller functions and hardware interface documentation. ## Article ## A DIN-Rail Bridge for Existing Modbus Devices **WittelB WIN-CN-1M-1TCP connects Modbus RS485 equipment to an Ethernet network using a WIZnet W5500.** The converter comes from Augmatic Technologies Private Limited in Vadodara, Gujarat, India, which sells industrial sensors, input/output modules and gateways under the WittelB brand. Its purpose is straightforward: keep the serial devices already installed in a cabinet while making their readings accessible to a networked controller or monitoring application. The product is listed in the current WittelB catalog as **SKU CN-4001**, with a DIN-rail enclosure and browser-based configuration. The manufacturer updated the product record and its current datasheet in July 2026. The datasheet includes a photograph of the assembled circuit board with the W5500 marking visible beside the Ethernet connector. ![An authored technical diagram shows RS485 field devices connected through the WIN-CN-1M-1TCP converter to a Modbus TCP application over Ethernet](https://maker.wiznet.io/upload/ckeditor5/ec812d9ced7a4c238a60b523de15c602.png) *Authored technical diagram: serial field devices reach an Ethernet application through the converter.* The useful distinction is between a bare Ethernet module and a finished protocol converter. A bare module gives another circuit a network interface. WIN-CN-1M-1TCP packages the interface with serial communication, configuration pages, power connections and an enclosure for installation. The [manufacturer product page](https://wittelb.com/product/io-module-product-code-win-cn-1m-1tcp/) shows the finished enclosure; page 8 of the [current datasheet](https://wittelb.com/wp-content/uploads/2026/03/Wittelb-WIN-CN-1M-1TCP-1-3.pdf) shows the internal board. ## What Travels Between RS485 and Ethernet? Modbus is a request-and-response protocol commonly used to read measurements and control values in industrial equipment. A register is an addressable value, such as a sensor reading or a setting. The application needs the device address and register map to know which value to request and how to interpret the reply. **Modbus RTU carries those requests over a serial connection; Modbus TCP carries them through a TCP/IP network.** RS485 supplies the electrical signaling for the serial side. Ethernet supplies the wired network connection on the other side. The converter joins these two communication paths so an Ethernet application can reach the serial equipment. WittelB describes the serial side as a Modbus RTU master, meaning it issues requests to the attached devices. The current datasheet says the converter can host **up to four Modbus masters** on the network side. That gives several supervisory clients a route to the same serial equipment, subject to the converter and serial bus handling their requests. The application still needs the correct slave address, function code and register definitions. Converting the transport does not give the gateway knowledge of the meaning of every connected instrument. A temperature value, for example, still needs the scaling and units defined by the instrument manufacturer. ## Where the W5500 Fits The W5500 provides the **Ethernet connection between the converter electronics and the local network**. In the current datasheet photograph, the WIZnet device sits near the RJ45 connector, with its crystal and surrounding circuitry on the same PCB. The board also carries serial terminals, power circuitry, indicators and reset controls. The W5500 is an Ethernet controller with an integrated network interface and hardware TCP/IP capabilities. Modbus conversion remains an application task: the gateway must handle requests, communicate with the serial devices and return their data. The W5500 supplies the network connection used by that application. The current documentation does not include the firmware source or a complete schematic. Consequently, the public material supports the chip identification and product data path, while details such as the selected driver, socket allocation and host-to-chip pin mapping remain unpublished. The W5500 is shown as part of the converter board, rather than as an optional external Ethernet accessory. ## Configure the Network, Then Check a Register The current WIN-CN-1M-1TCP manual separates the operational network address from the configuration interface. The documented Modbus TCP address is **192.168.1.254 on port 502**. For configuration and local viewing, the manual describes joining a Wi-Fi access point and opening **192.168.4.254** in a browser. These addresses serve different purposes during setup. ![An authored address guide separates the Modbus TCP data connection at 192.168.1.254 port 502 from the manual's Wi-Fi configuration interface at 192.168.4.254](https://maker.wiznet.io/upload/ckeditor5/2cee29c0740e4b228b60b22e472c4b0e.png) *Authored setup guide: the current manual gives separate addresses for network data and local configuration.* The first configuration page accepts the Ethernet MAC address, IP address, gateway and subnet mask. Another page sets the RS485 baud rate, data bits, parity and stop bits. Those serial settings need to match the connected equipment before register requests can produce meaningful replies. The third page is the particularly useful installation feature. An operator enters the **slave ID, starting register address, quantity and function code**, then requests the data. The page presents returned register numbers and values in a table. This gives the installer a local way to check communication with a field device before connecting the final monitoring application. ![Four request fields lead to returned register numbers and values, showing how local polling helps separate serial commissioning from the Ethernet application](https://maker.wiznet.io/upload/ckeditor5/1c414dbcde0d45df9e07842c632b1bca.png) *Authored workflow: enter the request details, fetch the data and inspect the returned registers.* If a value appears locally but the supervisory application cannot read it, the installer can focus on the network address and application configuration. If the local request also fails, the serial wiring, serial settings, device address and requested registers become the first checks. The register viewer therefore contributes to commissioning as well as day-to-day visibility. ## How the Converter Fits the WittelB Product Family WittelB presents its catalog as sensors, field data acquisition modules and gateways. Within that system, WIN-CN-1M-1TCP provides a network route for Modbus serial devices. It belongs to the converter lineup rather than acting as a sensor or a general-purpose Ethernet development board. The neighboring **WIN-CN-M-2AO**, SKU CN-4002, illustrates a different conversion task: Modbus RTU input becomes a 4–20 mA analog output. The **WIN-MD-W5500** supplies Serial Peripheral Interface (SPI) Ethernet connectivity to a customer-designed host circuit. These products solve different integration problems even though the same company sells them. ![An authored catalog comparison distinguishes the W5500 SPI module, the Modbus RS485 to Ethernet converter, and the Modbus to analog-output converter](https://maker.wiznet.io/upload/ckeditor5/5ef9dc1744794b978b42cf05ddbadfc6.png) *Authored product-family comparison: a component module, a network converter and an analog-output converter serve different system roles.* For a closer look at the component-level product, the existing Maker article on the [WittelB WIN-MD-W5500 Ethernet module](https://maker.wiznet.io/Benjamin/resellers/what-is-inside-the-wittelb-win-md-w5500-an-own-brand-w5500-module-from-india/) describes the separate SPI module and its connector layout. The gateway adds the Modbus conversion and installation workflow around an Ethernet-equipped system. ## Vendor, Availability, and Price Augmatic describes WittelB as a company specializing in electronics design and manufacturing, including PCB design, assembly, embedded systems and IoT development. Its [company page](https://wittelb.com/about-us/) identifies Surajit Datta as founder and director and gives the factory address in Kotambi, Vadodara, India. As checked on **November 9, 2026**, the official WIN-CN-1M-1TCP page offers an **Add to Quote** route rather than a public checkout price. Buyers can request the converter under SKU CN-4001 through the product page or contact sales@wittelb.com. The page advertises a one-year comprehensive warranty; lead time, taxes and delivery terms belong in the quotation. The current catalog is useful as a maintained product reference, with a detailed commissioning manual and a view inside the assembled hardware. It is not a dated launch announcement. Applications listed in the datasheet include building management, energy monitoring, industrial automation and process control, all situations where existing serial instruments may need a network connection. Before installation, obtain the power specification and configuration instructions for the supplied hardware revision. The product page lists 24 V AC/DC, while the manual includes differing DC ranges. The documentation also does not publish a latency benchmark, firmware repository or independent deployment report. Those limits matter when sizing a system or planning custom firmware changes. ## FAQ **Q. Does WIN-CN-1M-1TCP contain a W5500?** Yes. Page 8 of the current manufacturer datasheet shows the WIZnet W5500 marking on the assembled converter PCB beside the Ethernet circuitry. **Q. What does the converter do for Modbus equipment?** It connects Modbus RS485 devices to a Modbus TCP network, allowing a network application to request data from the serial devices. **Q. How is the converter configured?** The current manual describes a Wi-Fi configuration interface at 192.168.4.254 for network and RS485 settings. It lists 192.168.1.254 and port 502 for the Modbus TCP connection. **Q. Can an installer check data without the final monitoring application?** Yes. The local register page accepts a slave ID, starting address, quantity and function code, then displays returned register numbers and values. **Q. Where can the converter be ordered?** WittelB offers it by quotation under SKU CN-4001. The manufacturer page provides the quote route and sales contact; confirm the supplied revision, price and delivery terms with that quotation. --- Source: https://maker.wiznet.io/Benjamin/resellers/how-does-wittelb-win-cn-1m-1tcp-use-w5500-to-connect-modbus-rs485-devices/