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header-product StarTech.com DB9 RS232 Serial Null Modem Adapter - Male to Female
6.99 €

StarTech.com DB9 RS232 Serial Null Modem Adapter - Male to Female

StarTech.com DB9 RS232 Null Modem Adapter NM9MF Photo 1
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StarTech.com DB9 RS232 Serial Null Modem Adapter - Male to Female

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StarTech.com DB9 RS232 Serial Null Modem Adapter - Male to Female

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Short description

The StarTech.com DB9 RS232 Serial Null Modem Adapter features male and female DB9 connectors in a grey finish. Designed to bridge serial communication devices by crossing transmit and receive lines, this adapter enables direct computer-to-computer or peripheral data transfer and debugging in legacy and industrial systems.
Available at price 6.99 €: 10 pcs.
Total available for order: 22 pcs.
Warranty: 2 Years
SKU: 639506
Manufacturer: StarTech
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
30.09.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
05.10.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.04 kg)
Parcel couriers
Unisend LV / Venipak Pickup LV / Venipak Locker LV / DPD Paku skapis / Omniva LV / Latvijas Pasts pakomāts / Latvijas Pasts nodaļa
05.10.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.99 €
payment
Payment Methods:
Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay
Available for private customers at price 94.99 €: 12 pcs.
Together cheaper
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Product information

Description

The StarTech.com DB9 RS232 Serial Null Modem Adapter - Male to Female is a practical solution for bridging serial communication devices. Designed with a DB9 male connector on one end and a DB9 female connector on the other, this adapter facilitates direct data transfer and device communication by crossing the transmit and receive lines. It offers an efficient method for converting a standard straight-through serial cable into a functional null modem cable without needing to purchase an entirely new cable assembly.

Advantages

Using this null modem adapter provides a reliable and cost-effective alternative to replacing existing cables when setting up legacy or industrial equipment. Its compact design ensures easy integration into tight spaces behind computers, servers, or industrial machinery. The durable construction helps maintain stable signal transmission during critical debugging and data communication tasks, while the straightforward male-to-female configuration allows for quick, tool-free installation between devices.

Suitable for

  • Connecting two computers directly via serial ports for data transfer
  • Debugging and configuring legacy industrial machinery and automation equipment
  • Converting standard straight-through serial cables into null modem connections
  • Interfacing with networking hardware and older peripheral devices requiring RS232 communication

When it may not be suitable

This adapter is not designed for standard straight-through serial connections where line crossing is undesired, as it will prevent proper communication in those specific setups. Additionally, it is unsuitable for modern computer systems lacking physical RS232 serial ports unless an appropriate USB-to-serial converter is used.

Key specifications

  • Connector 1: DB9 male
  • Connector 2: DB9 female
  • Colour: Grey
  • Quantity per package: 1 piece

How to use

To use the adapter, ensure that both connected devices are powered off to prevent potential electrical damage. Attach the DB9 male end of the adapter to the corresponding female port on your cable or device, and secure the connection using the integrated thumbscrews if applicable. Next, attach the remaining end of your setup to the female port of the adapter. Once securely fastened, power on your equipment and configure your terminal or communication software to utilize the correct COM port settings for data transfer or debugging.

What to consider before purchase

  • Verify that your devices feature standard DB9 RS232 serial ports or that you have the necessary converters
  • Confirm whether your application specifically requires a null modem crossover configuration rather than a straight-through connection
  • Check the physical space around your equipment ports to ensure the adapter's dimensions fit comfortably

Usage recommendations: Always secure the connector screws firmly to maintain a stable connection and prevent accidental disconnection during critical data transfers or equipment debugging sessions.

All features
Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
0.033 kg
Package weight: Weight of the packaged product.
38 g
Height: The measurement of the product from head to foot or from base to top.
15 mm
Width: The measurement or extent of something from side to side.
33.6 mm
Depth: The distance from the front to the back of something.
50.5 mm
Product colour: The colour e.g. red, blue, green, black, white.
Grey
Package depth: The distance from the front to the back of the packaging.
88 mm
Package height: The distance from the top to the bottom of the packaging.
25 mm
Package width: The distance from one side of the packaging to the other.
56 mm
Master (outer) case height:
330 mm
Master (outer) case width:
310 mm
Connector 1: This is the first connector in the device.
DB9
Connector 2: This is the second connector in the device.
DB9
Connector 1 form factor:
Straight
Connector 2 form factor:
Straight
Connector 1 gender: The gender of the first connector of the product. Each half of a pair of mating connectors is assigned the designation male or female, the part bearing one or which fits into another being called male.
Male
Connector 2 gender: The gender of the second connector of the product. Each half of a pair of mating connectors is assigned the designation male or female, the indented one or the one fitting around the other being called female.
Female
Quantity per pack:
1 pc(s)
Master (outer) case length:
440 mm
Products per master (outer) case:
500 pc(s)
Compliance certificates: Indicates which regulatory, safety, and environmental standards the product complies with, as verified by recognized authorities or certification bodies.
RoHS, CE

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Stock data
Warehouse Stock Delivery to the store Store Price
WH354 12 30.09.2026 Best delivery
94.99 €
Available only for legal entities
Warehouse Stock Delivery to the store Store Price
WH15 10 30.09.2026 Best delivery
6.99 € Best price
94.99 €
Stock: 12
Delivery Date: 30.09.2026 Best delivery
Warehouse: WH354
Available only for legal entities
6.99 €
Stock: 10
Delivery Date: 30.09.2026 Best delivery
Warehouse: WH15

Customer reviews

Customer questions

FAQ

How much does the StarTech.com DB9 RS232 Null Modem Adapter NM9MF cost, and is it available for purchase?

The price is 6.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 22 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 30.09.2026 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: Cash payment, 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

Where can I download the instructions for StarTech.com DB9 RS232 Null Modem Adapter NM9MF?

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.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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