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A compact rectangular box with two DB-9 male ports and a USB cable, matte black finish

SerialGear

SerialGear USB to Dual Serial RS-422/485 Mountable Converter

SKU CH-6ZP3-QC8V4

Adds two RS-422/485 serial ports via USB with 384 byte receive buffer, 128 byte transmit buffer, auto transmit control and data rates from 300 to 230K bps

  • Adds two RS-422/485 ports through a single USB connection
  • 384-byte receive buffer handles incoming data bursts reliably
  • Auto transmit buffer control simplifies RS-485 half-duplex operation
  • Data rates from 300 bps to 230 Kbps suit legacy and modern gear
  • Self-powered design with external supply included for stable operation

Dual RS-422/485 over USB

The SerialGear converter adds two high-speed RS-422/485 ports through a single USB connection. It is aimed at engineers and integrators who need reliable serial links for printers, point-of-sale terminals or industrial control equipment. Each port appears as a native COM port in Windows without IRQ or DMA conflicts. The DB-9 male connectors carry full differential signals including RTS and CTS lines.

Self-powered with 384 byte receive buffer

The adapter draws power from the USB bus so no external supply is required in normal use. A 384 byte receive buffer and a 128 byte transmit buffer support sustained throughput at data rates from 300 bps to 230K bps. Auto transmit buffer control manages RS-485 direction changes without software overhead, keeping latency low and the link stable.

Mountable design for fixed installations

The rugged housing includes mounting points so the converter can be secured inside a cabinet, on a DIN rail bracket or directly on a machine frame. This frees up bench space and prevents cable strain on the USB link. The two DB-9 ports sit side by side for tidy wiring to multiple devices. No extra drivers beyond the standard Windows serial stack are needed.

Highlights

  • Adds two RS-422/485 ports through a single USB connection
  • 384-byte receive buffer handles incoming data bursts reliably
  • Auto transmit buffer control simplifies RS-485 half-duplex operation
  • Data rates from 300 bps to 230 Kbps suit legacy and modern gear
  • Self-powered design with external supply included for stable operation

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the SerialGear dual RS-422/485 converter and what step is often missed?

Connect the USB cable to the host and the DB-9 cables to the devices; the driver installs automatically and each port appears as a native COM port without IRQ or DMA conflicts, but the external power supply must be plugged in even though the adapter is self-powered.

What maintenance will the SerialGear dual RS-422/485 converter need later?

No scheduled maintenance is required; the unit has no moving parts or user-replaceable components, so only inspect the DB-9 connectors and external power supply for physical damage or loose cables over time.

What limit appears first on the SerialGear dual RS-422/485 converter during sustained high-speed use?

The 128 byte transmit buffer and 384 byte receive buffer fill first at the maximum 230 Kbps data rate, so the host must service the COM ports quickly enough to prevent overflow.

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