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Compact USB-to-serial converter with terminal block and status LEDs

Black Box Corporation

Black Box USB to RS422-485 Converter with Opto-Isolation cpu accessory

SKU CH-GR3P-ADEA3

Converts USB ports to RS-422/485 with 2000-volt optical isolation for legacy serial device connectivity

  • Connect legacy serial gear via USB
  • 2-wire RS-485 or 4-wire RS-422/485 operation
  • 2000-volt optical isolation protects equipment
  • High-retention USB connector holds tight
  • Interface powered, no external supply needed

USB-to-serial converter for legacy equipment

This USB-to-RS-422/485 converter lets you connect older serial devices to a modern PC or laptop that only has USB ports. It supports both 2-wire RS-485 and 4-wire RS-422/485 operation so existing industrial or commercial equipment can stay in service. The unit draws power from the USB bus, so no external supply is needed. It appears to the operating system as an additional COM port.

DIP-switch wiring and isolation in a compact dongle

A removable terminal block makes field wiring straightforward, while on-board DIP switches select between 2-wire and 4-wire modes. The high-retention USB connector keeps the link secure in vibration-prone environments. Built-in 2000-volt optical isolation protects the host computer from spikes and ground loops on the serial network. Status LEDs show transmit and receive activity for quick troubleshooting.

USB cable and driver-free COM-port setup

The package includes a 3-foot USB cable for immediate connection to USB 1.0, 1.1 or 2.0 ports at up to 12 Mbps. No separate driver installation is required on supported Windows versions; the device simply enumerates as a virtual COM port in Device Manager. This plug-and-play behaviour means legacy applications written for RS-422/485 continue to run without modification.

Highlights

  • Connect legacy serial gear via USB
  • 2-wire RS-485 or 4-wire RS-422/485 operation
  • 2000-volt optical isolation protects equipment
  • High-retention USB connector holds tight
  • Interface powered, no external supply needed

Specifications

No published specifications for this item yet.

Questions about this item

How long does the 12 Mbps USB 2.0 link sustain full throughput before the interface-powered converter throttles?

The converter is USB 1.0, 1.1 and 2.0 compatible at 12 Mbps and draws all power from the USB port, so sustained throughput is limited only by the host controller and cable quality, not by an internal thermal throttle.

Does the 2000-volt optical isolation keep the unit cool and quiet during continuous all-day RS-422/485 traffic?

The device has no fan and no moving parts; optical isolation protects the PC from spikes on the RS-422/485 network while the interface-powered design runs silently with negligible heat rise.

What must the host PC already provide for this converter to operate without an external supply?

A standard USB 1.0, 1.1 or 2.0 port supplying 5 V bus power is all that is required; the included 3-ft cable and removable terminal block handle the RS-422/485 wiring.

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