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A compact metal box with one DB9 input and four DB9 outputs, plus a power socket

DTech

DTech 8541673255 4-Port RS232 Splitter Data Adapter

SKU CH-PJ40-P1NAF

A DB9 serial expander turns one COM port into four independent hardware ports for simultaneous device control or data capture, with a metal-shielded enclosure and an included 5 V power adapter

  • First connectorDB9
  • Second connectorDB9
  • Connector genderDB9
  • Connector typeDB9
  • Units per package1
  • DetailsRS232 Splitter, DTECH 4 Port Serial Expansion Box 1 × 4 COM
  • Adds four hardware COM ports for simultaneous multi-device control
  • Bi-directional design lets one master drive four slaves or four masters share one slave
  • Metal housing with ±8 kV ESD protection shields signals and extends operating life
  • Driver-free plug-and-play operation works instantly with PCs, Macs and industrial equipment
  • Includes 5 V 1 A power adapter for stable, delay-free data transmission

Four-Port RS232 Expansion Box

The DTech 8541673255 adds four real hardware serial ports to a single DB9 connection on a PC or laptop. It suits engineers, integrators and hobbyists who must monitor or control several RS232 devices such as modems, scales or GPS receivers from one computer.

RS232 Electrical Limits Apply

The splitter passes signals at whatever baud rate and protocol the attached RS232C equipment uses, with no internal conversion or buffering. Cable length, noise immunity and maximum speed remain bound by the RS232 standard itself, so very long runs or high-speed links may still require signal conditioning.

Driver-Free Plug and Play

A supplied DC 5 V 1 A adapter powers the metal-housed unit, which includes ±8 kV ESD protection on the DB9 pins. Straight-through cables give a 1-to-4 fan-out, while null-modem cables enable a 4-to-1 combiner; mixing cable types or leaving ports unpowered are the common causes of no data.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $65.99
Pricier than about 90% of the 354 comparable items (median $21.99).

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Specifications

Product
Brand nameG-TECH
Product line8541673255
Model name8541673255
Part number8541673255
Ports & slots
First connectorDB9
Second connectorDB9
Connector genderDB9
Connector typeDB9
Size & build
Product dimensions28 in × 28 in × 25 in
Product weight200 g
In the box
Units per package1
In the boxRS232 Splitter, DTECH 4 Port Serial Expansion Box 1 × 4 COM Port Expander with Power Adapter for Sharing PCs and Capture Data x 1

Questions about this item

Which version of the 4-port RS232 splitter should I choose for a standard DB9 setup?

The 8541673255 model provides four DB9 female output ports and one DB9 male input port, all using the standard 2-TxD, 3-RxD, 5-GND pinout, so a single version covers typical straight-through and null-modem cabling.

What does the “no baud-rate limit” claim mean once the box is installed in a real machine?

The splitter passes whatever baud rate and protocol the connected RS232C devices negotiate; it adds no driver overhead or conversion latency, so throughput matches the slowest endpoint on the chain.

What interface standard does the splitter use and what does it cap in practice?

It uses the RS232C electrical standard on DB9 connectors; practical cable length and maximum speed are capped by the RS232C specification and the connected equipment, not by the splitter itself.

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