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Small USB dongle with RS485 port, dark plastic body

Qin Bo Electronics

Qin Bo Electronics 11402021 USB to RS485 transducer

SKU CH-JCY2-DE8GC

Converts USB to RS485 with TVS protection, CH340 chip and 75 to 115200 bps rates

  • Typical usePC Peripherals
  • Product typeSensors
  • Key featuresRS485 Converter
  • USB 2.0 compliant with RS485 standard for reliable data links
  • CH340 chip enables 75-115200 bps and up to 6 Mbps speeds
  • TVS tube and USB self-recovery protection guard against surges
  • Operates from -40°C to +85°C for harsh environments
  • Works with Windows 98/ME/2000/XP/Vista/7, Linux and Mac

USB-to-RS485 transducer for industrial data links

This Qin Bo Electronics 11402021 module converts a USB port into an RS485 half-duplex channel using a CH340 chip. It targets engineers and technicians who connect PLCs, LED displays, access-control panels, toll stations or attendance terminals to a PC. The adapter suits automation, monitoring and centralised appliance control projects that rely on serial bus communication.

Thermals, noise and power draw in normal use

The converter operates from -40 °C to +85 °C without active cooling, so it runs silently in cabinets or outdoor enclosures. It draws power directly from the USB 2.0 bus and includes TVS tube protection plus USB self-recovery protection against transients. No external supply or fan is required for typical half-duplex links up to the supported baud rates.

What the bundled accessory actually changes

The package supplies only the converter itself; no cable, driver disc or mounting hardware is included. Drivers for Windows 98 through Windows 7, Linux and Mac must be obtained separately to enable the 75 bps to 115200 bps range with a maximum of 6 Mbps. The bare board lets integrators solder or plug directly into existing terminal blocks and enclosures.

How it compares

Measured against everything we stock in Sensors, Transducers & Thermometers, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 96% of the 255 comparable items (median $39.99).

Specifications

Product
Brand nameQin Bo Electronics
Model name11402021
Product typeSensors

Questions about this item

How do I install the Qin Bo 11402021 USB to RS485 converter, and what driver step is often missed?

Plug the Mini USB end into the PC; Windows 98, ME, 2000, XP, Vista, 7, Linux and Mac all need the CH340 driver installed before the virtual COM port appears, otherwise the device stays invisible in Device Manager.

What part of the Qin Bo 11402021 is most likely to need replacement after long service?

The TVS tube protection and USB self-recovery protection absorb transients; after repeated surges the TVS devices can degrade and the board would need to be swapped out.

What is the first limit reached when the Qin Bo 11402021 runs continuously at high speed?

The CH340 chip tops out at 6 Mbps and the RS485 half-duplex line driver is rated to +85 °C; sustained maximum throughput in a hot enclosure will hit the thermal ceiling before the baud-rate ceiling.

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