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StarTech 2m DB9 RS232 Serial Null Modem Cable, Black (SCNM9FF2MBK) | 9 pin RS232 Null Modem Cable, Cross Wired, DB-9 (F) to DB-9 (F), Female to Female
StarTech.com

StarTech.com StarTech 2m DB9 RS232 Serial Null Modem Cable

Bottom line: The StarTech.com StarTech 2m DB9 RS232 Serial Null Modem Cable ($8.95 on Amazon as of 2026-10-06): Cross-wired null modem pinout works DTE-to-DTE with no extra adapter; main trade-off: 2 m fixed length only; no shorter or longer option in this SKU.

$8.95

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Cross-wired null modem pinout works DTE-to-DTE with no extra adapter
  • ✓ Backed by StarTech.com lifetime warranty
  • ✓ Shielded against EMI for stable console and PLC sessions
  • ✓ Molded connectors with strain relief survive repeated re-seating

Cons

  • ✗ 2 m fixed length only; no shorter or longer option in this SKU
  • ✗ Female-to-female only, so male DB9 ports need a gender changer
  • ✗ No USB; your PC needs a real RS232 port or USB-serial adapter
  • ✗ Null modem wiring is wrong for modems and other DCE devices

Manufacturer description

The StarTech.com SCNM9FF2MBK is a 2 m DB9 RS232 null modem cable wired female-to-female, built for the job legacy serial gear still demands: talking to a switch console port, flashing a PLC, driving a CNC controller, or moving files directly between two PCs over their 9-pin serial ports. The crossover (null modem) wiring swaps the transmit and receive lines internally, so you get a working DTE-to-DTE link without an adapter or a hand-soldered pinout. StarTech.com shields the cable against EMI and molds the connectors with integrated strain relief, which matters on a bench where the cable…

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SpecPicks Verdict

SpecPicks scored StarTech.com StarTech 2m DB9 RS232 Serial Null Modem Cable using a rating × review-volume × price-fit model applied to published specs and reviews across the cables & connectors category. StarTech.com's cables & connectors lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for cables & connectors of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

What is the difference between a null modem cable and a straight-through serial cable?

A null modem cable is cross-wired: transmit and receive lines are swapped internally so two DTE devices, such as two PCs, can talk directly. A straight-through cable passes pins one-to-one and is meant for DTE-to-DCE links like a PC to a modem. The SCNM9FF2MBK is the cross-wired null modem type.

Will this cable work for a Cisco or switch console port?

It terminates in DB-9 female on both ends with null modem crossover wiring, which is the standard arrangement for many RS232 console connections. Confirm your device's console port is DB-9 male and expects a null modem pinout; if it uses RJ45 or a male-to-female run, you'll need a different cable or an adapter.

How long is it, and how much does it weigh?

The cable is 2 m (about 6.6 ft). Shipping specs list the package at 7.04 x 4.92 x 0.74 inches and 0.264 pounds, so it ships as a light, compact coil.

Is there a warranty on this StarTech.com cable?

Yes. StarTech.com backs this RS232 null modem cable with a lifetime warranty. Check the product listing for the current warranty terms and claim process that apply to your region.

Can I use it to transfer files between two old PCs?

Yes, direct PC-to-PC file transfer over a serial connection is one of its stated uses. Both machines need a 9-pin RS232 port (or a USB-to-serial adapter) plus file-transfer software such as a terminal program with a Z-modem or Kermit transfer, since the cable itself only provides the physical link.

Key Features

  • Connect your serial devices and transfer your files
  • 2m DB9 Null Modem Cable
  • DB9 Female to Female Cable
  • RS232 Null Modem Cable
  • 9 pin Null Modem Cable
  • 2 m Black Female to Female Null Modem Cable

Full Specifications

BrandStarTech.com
ColorBlack
Gauge28.0
ModelSCNM9FF2MBK
Cable TypeSerial
Item ShapeRound
Model NameSCNM9FF2MBK
Unit Count1.0 Count
Item Length6.6 Feet
Part NumberSCNM9FF2MBK
Connector TypeSerial
Item Type NameData Transfer Cable
Number of Pins9
Outer MaterialPolyvinyl Chloride (PVC)
Connection TypeWired
Number of Items1
Special FeatureData Transfer
Connector GenderFemale-to-Female
Item Part NumberSCNM9FF2MBK
Compatible DevicesModem, PC
Full listing titleStarTech 2m DB9 RS232 Serial Null Modem Cable, Black (SCNM9FF2MBK) | 9 pin RS232 Null Modem Cable, Cross Wired, DB-9 (F) to DB-9 (F), Female to Female

Ready to buy?

StarTech 2m DB9 RS232 Serial Null Modem Cable, Black (SCNM9FF2MBK) | 9 pin RS232 Null Modem Cable, Cross Wired, DB-9 (F) to DB-9 (F), Female to Female is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $8.95

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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StarTech 2m DB9 RS232 Serial Null Modem Cable, Black (SCNM9FF2MBK) | 9 pin RS232 Null Modem Cable, Cross Wired, DB-9 (F) to DB-9 (F), Female to Female
$8.95
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