# F&F LT-04 Termination and Polarization Module for RS-485 MODBUS Network

**URL:** https://aio.lv/en/product--ff-lt-04--12464941
**Data updated:** 2026-05-18 09:27 (EEST)
**Category:** Network Equipment Accessories
**Manufacturer:** FF
**Manufacturer code:** LT-04
**EAN:** 5908312594345
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 20.99 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 17.35 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-lt-04--12464941

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

The F&F LT-04 is a specialized termination and polarization module designed for RS-485 networks using the MODBUS protocol. It ensures signal integrity and proper bus biasing, which is essential for stable communication in industrial automation and control systems. This compact device helps prevent signal reflections and errors, providing reliable data transmission across the network infrastructure.

## Long description

The F&F LT-04 is a specialized termination and polarization module engineered for RS-485 networks utilizing the MODBUS protocol. This device is essential for maintaining signal integrity and ensuring proper bus biasing within industrial automation and control systems. By providing the necessary electrical characteristics, it effectively prevents signal reflections and communication errors, thereby facilitating stable and reliable data transmission across complex network infrastructures.
Advantages
The primary benefit of the F&F LT-04 is its ability to stabilize the RS-485 bus, which is critical for long-distance communication and environments prone to electromagnetic interference. Its compact design allows for easy integration into existing control cabinets without requiring significant space. By correctly terminating the line and providing the required voltage levels, the module minimizes data packet loss and reduces the need for frequent troubleshooting of communication faults in MODBUS-based systems.
Suitable for
Industrial automation systems
Building management and control networks
MODBUS RTU/ASCII communication lines
RS-485 network segments requiring signal stabilization
When it may not be suitable
This module is not intended for use in networks that do not utilize the RS-485 physical layer or protocols other than MODBUS where different termination requirements apply. It should not be used in high-voltage power circuits or environments exceeding the specified operating temperature and humidity limits.
Key specifications
Compatible with RS-485 interface
Designed for MODBUS protocol networks
Provides bus termination and polarization
Compact housing for DIN rail or panel mounting
How to use
The LT-04 module should be installed at the physical ends of the RS-485 bus segment to ensure proper termination. Connection is performed by wiring the module in parallel with the data lines according to the standard RS-485 configuration. Ensure that the power supply and signal polarity are correctly matched to the network requirements before energizing the system.
What to consider before purchase
Verify that your network architecture requires active termination and polarization
Check the total length and number of devices on your RS-485 bus
Ensure compatibility with your existing control cabinet mounting standards
Usage recommendations
For optimal performance, install the termination module at both ends of the RS-485 transmission line to effectively eliminate signal reflections and maintain consistent communication quality throughout the network.

## FAQ

### How much does the F&F LT-04 RS-485 MODBUS Termination and Polarization Module cost, and is it available for purchase?

The price is 20.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 12 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 06.07.2026 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, Bank cards on-line, Apple Pay, Google Pay. 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 FF 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 FF 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/12464941/68766557_large.webp