# Serial null modem adapter StarTech DB9 RS232 M/M, DB-9 male to DB-9 male, white

**URL:** https://aio.lv/en/product--startech-nm9mm--4813242
**Data updated:** 2026-02-07 21:02 (EET)
**Category:** Screwdriver Bits
**Manufacturer:** StarTech
**Manufacturer code:** NM9MM
**EAN:** 0065030815796
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 7.99 €
**Prices and availability valid until:** 2026-07-07 23:59
**Price without VAT (21%):** 6.60 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-nm9mm--4813242

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 01.07.2026 | free |
| Pickup points | 06.07.2026 | 1.99 EUR |
| Courier delivery to door | 06.07.2026 | 4.99 EUR |

## Summary description

StarTech DB9 RS232 serial null modem adapter (M/M) connects two DB-9 serial ports directly by cross‑wiring transmit and receive lines. It features DB-9 male connectors on both ends and a white housing. Suitable for legacy RS232 equipment, point-to-point serial communication, debugging and device configuration where a null modem is required.

## Long description

StarTech DB9 RS232 serial null modem adapter (male-to-male) allows two DB-9 serial ports to be connected directly by cross-wiring transmit and receive lines. The adapter uses DB9 male connectors on both ends with a white housing and is intended for use with legacy RS232 equipment and point-to-point serial links where a null modem connection is required.
Advantages
The adapter provides a cost-effective way to convert a straight-through DB9 cable into a null modem connection without requiring a dedicated null modem cable. Its compact in-line form factor ensures easy insertion between standard DB9 connectors, and the product is backed by lifetime warranty and free lifetime technical support from the manufacturer.
Suitable for
Connecting two RS232 devices directly (PC-to-PC, PC-to-router console)
Device configuration and debugging of legacy equipment
Point-to-point serial communication and data transfer
Temporary or field installations where a full null modem cable is not available
Key specifications
Connector type: DB9 male to DB9 male
Signal standard: RS232 (null modem cross-wiring)
Housing color: white
Form factor: in-line adapter
Use case: serial null modem (crossed TX/RX)
How to use
Connect each DB9 male end of the adapter into the corresponding DB9 female port of the two devices you want to link. The adapter cross‑wires the transmit and receive lines required for a null modem connection, allowing direct serial communication without modifying existing cables. Ensure both devices are configured for matching serial settings (baud rate, parity, data bits, stop bits) before starting communication.
Usage recommendations
Use this adapter with standard DB9 serial ports and keep cable lengths within recommended RS232 distances for reliable communication; verify device serial settings and, if needed, use shielding or ferrite cores in electrically noisy environments.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.032 kg |
| Height | 15 mm |
| Width | 33.6 mm |
| Depth | 50.5 mm |
| Product colour | White |
| Package depth | 82 mm |
| Package height | 125 mm |
| Package width | 90 mm |
| Master (outer) case height | 440 mm |
| Master (outer) case width | 300 mm |
| Connector 1 | DB-9 |
| Connector 2 | DB-9 |
| Connector 1 form factor | Straight |
| Connector 2 form factor | Straight |
| Connector 1 gender | Male |
| Connector 2 gender | Male |
| Quantity per pack | 1 pc(s) |
| Master (outer) case length | 430 mm |
| Products per master (outer) case | 500 pc(s) |
| Sustainability certificates | RoHS, CE |

## FAQ

### How much does the StarTech DB9 RS232 Null Modem Adapter M/M cost, and is it available for purchase?

The price is 7.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 01.07.2026 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 StarTech 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 StarTech 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

### Where can I download the instructions for StarTech DB9 RS232 Null Modem Adapter M/M?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/4813242/59141638_large.webp