# RS485 Modbus communication card Unit U-Modbus-Card for serial connection and protocol integration

**URL:** https://aio.lv/en/product--unit-u-modbus-card--1632824
**Data updated:** 2026-02-12 09:43 (EET)
**Category:** Server Parts & Components
**Manufacturer:** Unit
**Manufacturer code:** U-MODBUS-CARD
**EAN:** 4250154107414
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 303.49 €
**Prices and availability valid until:** 2026-07-07 23:59
**Price without VAT (21%):** 250.82 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-u-modbus-card--1632824

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

Unit U-Modbus-Card is an RS485 Modbus communication card designed to provide serial Modbus connectivity for compatible devices and controllers. The card enables protocol integration over RS485 for data exchange, monitoring and control in automation systems. It is suitable for connecting equipment that supports Modbus RTU, facilitating system interoperability and simplifying installation and wiring.

## Long description

Unit U-Modbus-Card is an RS485 Modbus communication card designed to add serial Modbus connectivity to compatible devices and controllers. The card supports Modbus RTU communication over a two-wire RS485 interface, enabling data exchange, monitoring and control within automation systems. It is intended to simplify integration of equipment that uses Modbus protocol by providing a compact communication interface for serial networks and multi-drop topologies.
Advantages
The Unit U-Modbus-Card provides a standardized RS485 interface for reliable serial communication, reducing the need for custom protocol converters. Its Modbus RTU compatibility enables straightforward integration with many industrial controllers, PLCs and SCADA systems. The card’s compact design allows installation inside cabinets or on device PCBs, helping to streamline wiring and minimize space consumption. By using a common protocol and physical layer, the card facilitates interoperability and easier system maintenance.
Suitable for
 Integration of controllers, meters and sensors into Modbus RTU networks
 Data acquisition and monitoring in building automation and industrial control
 Expanding legacy equipment with serial Modbus connectivity
 Control and supervisory communication with PLCs or SCADA systems
Key specifications
 Interface: RS485 two-wire differential serial link
 Protocol compatibility: Modbus RTU
 Transmission: Asynchronous serial communication
 Topology: Multi-drop network support
 Mounting: Compact card form factor for internal installation
 Environment: Designed for use in automation and control enclosures
How to use
Install the Unit U-Modbus-Card into the compatible host device or enclosure following the manufacturer’s mechanical and electrical interface guidelines. Connect the RS485 A/B differential pair to the network bus, ensuring proper termination and biasing where required by the installation. Configure the host device or controller to use Modbus RTU settings (baud rate, parity, data bits, stop bits) that match other nodes on the bus. Verify addressing and polling parameters so the card communicates with the correct master or slave devices.
Usage recommendations
For dependable communication, use twisted-pair shielded cable for the RS485 bus, observe recommended termination and bias resistor placement, and avoid routing the bus next to high-voltage or noisy power lines. Confirm matching serial settings across devices and test the network with a known Modbus master to validate data exchange before commissioning.

## FAQ

### How much does the Unit U-Modbus-Card RS485 Modbus communication card cost, and is it available for purchase?

The price is 303.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 9 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 08.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Unit products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Unit service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/1632824/66635327_large.webp