# D-sub Null Modem Adapter ACT AB9803 9 pole Female to Male

**URL:** https://aio.lv/en/product--act-ab9803--3304044
**Data updated:** 2026-03-20 09:43 (EET)
**Category:** Cable Adapters & Converters
**Manufacturer:** ACT
**Manufacturer code:** AB9803
**EAN:** 8716065128222
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 21.99 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 18.17 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--act-ab9803--3304044

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.99 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

The ACT D-sub Null Modem Adapter features a 9-pin female to 9-pin male configuration, ideal for connecting devices that require a null modem connection. This adapter is designed for reliable data transmission and is compatible with various serial devices. Its compact design makes it easy to use and transport, ensuring seamless connectivity for your communication needs.

## Long description

The ACT D-sub Null Modem Adapter AB9803 provides a simple, compact solution for converting a 9-pin D-sub female connector to a 9-pin D-sub male connector while implementing the null modem wiring required for direct serial communication between two DTE devices. Designed for reliable RS-232 signal routing, the adapter preserves signal integrity for asynchronous serial links and is suitable for short cable runs and equipment-to-equipment connections where a null modem crossover is needed.
Advantages
This gender-changer style null modem adapter offers plug-and-play convenience with a small footprint that is easy to carry and install. Its fixed wiring eliminates the need for custom cabling or soldering when establishing a direct serial link. The robust D-sub shell provides mechanical protection and ensures stable connector alignment during use, while the straightforward female-to-male configuration makes it compatible with a wide range of serial ports on legacy and industrial equipment.
Suitable for
Connecting two computers or terminals directly via RS-232 without a modem
Linking serial instruments, CNC controllers, or PLCs that require a null modem crossover
Temporary diagnostics, configuration or firmware updates over a serial port
Interfacing legacy industrial or laboratory equipment with 9-pin D-sub ports
Key specifications
Connector configuration: 9-pin D-sub female to 9-pin D-sub male with null modem wiring
Signal standard: RS-232 compatible pin assignments for TX, RX and control lines
Mechanical: standard D-sub metal shell for secure mating and EMI shielding
Form factor: compact gender-changer adapter, lightweight and portable
Use environment: intended for short-range serial connections and device-to-device communication
How to use
Plug the 9-pin female end of the adapter onto the male connector of the first device and connect the 9-pin male end to the female port of the second device. Ensure both devices are powered off or follow hot-plug guidelines from the equipment manufacturers. Verify serial port settings such as baud rate, parity, data bits and stop bits on both devices before initiating communication. The adapter performs the necessary TX/RX and handshake line crossover so no additional wiring changes are required.
Usage recommendations
Use the adapter for direct RS-232 links over short cable distances and avoid subjecting it to excessive strain or exposure to moisture. For longer runs or environments with significant electrical noise, consider using shielded cables or an appropriate signal booster/isolator.

## Specifications

### Features

| Feature | Value |
|---|---|
| Connector 1 | 9-pin M |
| Connector 2 | 9-pin F |
| Connector 1 gender | Male |
| Connector 2 gender | Female |

## FAQ

### How much does the D-sub Null Modem Adapter ACT AB9803 cost, and is it available for purchase?

The price is 21.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 149 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 13.07.2026 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 ACT 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 ACT 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: connector 1, connector 2, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/3304044/64212931_large.webp