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Black RS-232 to RS-485 USB converter with DB9 connectors and terminal block

GearMo

GearMo GM-1004E-B RS-232 to RS-485 USB Converter

SKU CH-SX5B-JD178

Converts RS-232 signals to RS-485 for industrial automation over 1.2 km at up to 115.2 kbps

  • ColorBlack
  • Converts RS-232 signals to balanced RS-485 differential signals for industrial communication
  • Extends RS-232 transmission distance up to 1.2km using twisted-pair or shielded cable
  • Operates at 300 to 115.2kbps baud rate with asynchronous half-duplex mode
  • Built-in TVS protection safeguards RS-485 port against transient voltage spikes
  • Zero-delay auto receive/transmit conversion requires no handshake signals or software changes

Industrial Serial Converter

The GearMo GM-1004E-B connects a PC RS-232 port to RS-485 networks using a DB9 female, DB9 male and terminal block. It targets engineers and integrators who need to link legacy serial equipment or intelligent instruments over long cable runs in industrial automation or access-control systems.

Sustained Communication Behaviour

Asynchronous half-duplex differential transmission runs at 300 to 115.2kbps across twisted-pair or shielded cable up to 1,200m on the RS-485 side. Built-in zero-delay auto receive and transmit conversion manages data-flow direction without handshake signals so existing software continues to operate without modification.

Thermals Noise and Power

The adapter draws power directly from the RS-232 port through charge-boost circuitry removing the need for an external supply. Advanced transient voltage suppressors protect the RS-485 interface from surges while the passive design produces no audible noise during continuous operation.

Highlights

  • Converts RS-232 signals to balanced RS-485 differential signals for industrial communication
  • Extends RS-232 transmission distance up to 1.2km using twisted-pair or shielded cable
  • Operates at 300 to 115.2kbps baud rate with asynchronous half-duplex mode
  • Built-in TVS protection safeguards RS-485 port against transient voltage spikes
  • Zero-delay auto receive/transmit conversion requires no handshake signals or software changes

Specifications

BrandGearmo
ModelGM-1004E-B
ColorBlack

Questions about this item

Does the GM-1004E-B generate much heat when converting RS-232 to RS-485 continuously?

The converter draws power from the RS-232 port using charge-boost technology and has no fan, so it runs cool during all-day operation.

What cables or ports must I already have to connect this converter?

You need an available RS-232 DB9 male port on the host and a twisted-pair or shielded cable for the RS-485 DB9 male or terminal-block side.

Will the GM-1004E-B work with my older 300 bps RS-232 equipment?

Yes, the baud-rate range covers 300 to 115.2 kbps, so legacy 300 bps devices communicate without software changes.

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