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Black USB converter with DB9 female and terminal block connectors

GearMo

GearMo GM-10211-B RS-232 to RS-485 USB converter

SKU CH-4QTC-2CCT5

Converts RS-232 to RS-485 for 1.2km industrial links at up to 115.2kbps

  • ColorBlack
  • Extends serial links to 1.2 km via RS-485 differential signalling
  • Operates at 300 to 115.2 kbps without software changes
  • Powers itself from the RS-232 port — no external supply needed
  • Auto direction control removes RTS/DTR handshake wiring
  • Connects DB9 female to terminal block for industrial networks

GearMo GM-10211-B USB Converter

The GearMo GM-10211-B is a USB converter that bridges RS-232C and RS-485 EIA/TIA serial standards. It features a DB9 female connector on the RS-232 side and a terminal block for RS-485 wiring. The unit draws power directly from the RS-232 port without requiring port initialisation. It suits engineers and technicians who need to extend legacy serial links over long distances.

Industrial automation and legacy system integrators

This converter fits industrial automation, access control, parking, ATM, bus charging, ticketing, attendance and toll station systems. It supports point-to-point and point-to-multipoint networking between hosts or host-to-SCM setups. Buyers needing full-duplex RS-485 operation or isolated signal protection should look elsewhere. It is not suited for applications requiring handshake signals such as RTS or DTR control.

1.2 km reach at up to 115.2 kbps

The RS-485 side transmits up to 1.2 km while the RS-232 side covers 5 m. Baud rates range from 300 to 115.2 kbps using asynchronous half-duplex differential transmission. Built-in zero-delay auto direction control manages data flow without software changes. Throughput drops at maximum distance and the half-duplex mode limits simultaneous bidirectional traffic.

Highlights

  • Extends serial links to 1.2 km via RS-485 differential signalling
  • Operates at 300 to 115.2 kbps without software changes
  • Powers itself from the RS-232 port — no external supply needed
  • Auto direction control removes RTS/DTR handshake wiring
  • Connects DB9 female to terminal block for industrial networks

Specifications

BrandGearmo
ModelGM-10211-B
ColorBlack

Questions about this item

What RS-232 connector must my existing device have to plug into the GM-10211-B?

Your device needs a DB9 male connector because the converter provides a DB9 female port.

Will the converter work with my legacy RS-232 equipment that only runs at 300 BPS?

Yes, the baud-rate range starts at 300 BPS and goes up to 115.2 KBPS, so older low-speed gear is supported.

How can I verify the link is active after wiring the RS-485 terminal block?

Check that data flows at the configured baud rate up to 115.2 KBPS and that the connection holds over the full 1.2 km RS-485 distance.

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