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Black metal box with four DB-9 ports and a USB cable

SerialGear

SerialGear USBG-4X232P1 4-port RS-232 USB 2.0 serial adapter 0.9 m cable

SKU CH-4HNQ-JVBFW

Adds four RS-232 serial ports via a single USB 2.0 connection with 921.6K bps speed and full modem control signals

  • Connector count4
  • Product colorBlack
  • DetailsSerial Modes: RS232
  • Adds four RS-232 ports via a single USB 2.0 connection
  • Full modem-control signals TxD RxD RTS CTS DSR DTR DCD RI GND
  • Port speeds up to 921.6K bps for legacy devices
  • Bus-powered from a 500 mA USB host port no external supply needed
  • SECC metal chassis with DIN-rail bracket fits industrial cabinets

Adds four RS-232 ports via USB

This USB 2.0 adapter instantly provides four DB-9 serial ports for connecting legacy industrial, networking or point-of-sale equipment to a modern computer. The 0.9 metre cable reaches nearby ports without strain and the unit draws all power from the USB host, so no external supply is needed. A sheet-metal chassis with DIN-rail bracket suits cabinet or rack mounting.

Suits engineers adding serial ports to USB-only PCs

Technicians who need up to 921.6K bps with full modem control signals on Windows 98 through 2003 will find plug-and-play operation. Builders requiring USB 3.0 speeds, isolated ports or Linux and macOS support should look at other solutions.

Maximum serial speed 921.6K bps

Each port supports standard RS-232 signals including TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI and GND at rates up to 921.6 kilobits per second. If your application demands higher throughput or different electrical levels this adapter will not meet the requirement.

How it compares

Measured against everything we stock in RS-232 Serial Cables, at today’s prices. Recalculated every night.

Price $85.99
Pricier than about 89% of the 93 comparable items (median $21.99).

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Specifications

Product
Brand nameSERIALGEAR
Model nameUSBG-4 × 232P1
Product colorBlack
Ports & slots
Connector count4

Questions about this item

Does the 0.9 m USB cable come attached or do I need a separate cable?

The 0.9 m USB cable is included with the adapter so no extra cable is required for the host connection.

Should I pick this quad-port model or a dual-port version for four RS-232 devices?

This model provides exactly four DB-9 ports, matching a four-device requirement without daisy-chaining.

Will the 921.6K bps rating hold when all four ports run together on a USB 2.0 link?

Each port can reach 921.6K bps; the USB 2.0 host supplies 500 mA and the adapter is bus-powered for all four ports simultaneously.

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