USB TO RS232 / RS485 / TTL Industrial Isolated Converter

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This is an industrial USB to RS232/485/TTL isolated converter with original FT232RL inside
In stock
  • 2+: $20.90
  • 50+: $19.90

This is an industrial USB to RS232/485/TTL isolated converter with original FT232RL inside. It features embedded protection circuits such as power isolation, ADI magnetical isolation, and TVS diode, etc. What's more, the USB TO RS232/485/TTL comes with an aluminium alloy enclosure, make it solid and durable to work.

The USB TO RS232/485/TTL is very easy to use, fully automatic transceiving without delay. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirement.



  • Adopt original FT232RL, fast communicating, stable and reliable, better compatibility

  • Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal

  • Onboard unibody magnetical isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption

  • Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic

  • Onboard self-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance

  • Fully automatic transceiver circuit with no delay, ensures the USB port communicates with different interfaces fastly and stably, without interfering each other

  • Onboard TTL serial 3.3V/5V voltage translator, config the TTL level via switch

  • Aluminium alloy enclosure with sand blasting and anodic oxidation, CNC process opening, solid and durable

  • 3 LEDs for indicating the power and transceiver status

  • High quality USB-B and RS232 connectors, smoothly plug/pull

Technical details

Dimensions 27.4mm x86.5mm x71.6mm
Weight G.W 0g
Battery Exclude
Product type industrial optically isolated converter
Baudrate 300-921600bps
Host port USB
Device port RS485/RS232/TTL
Operating voltage 5V
Connector USB-B
Protection 200mA self-recovery fuse, isolated output
Transmission distance ~5m
Connector screw terminal
Pins A+, B-, GND
Direction control hardware automatic control
Protection 600W lightning-proof and surge-suppress, 15KV ESD protection (reserved 120R balancing resistor solder pads)
Transmission distance ~1200m
Transmission mode point-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)
Connector DR9 male
Protection TVS diode, surge protection, ESD protection
Transmission distance ~15m
Transmission mode point-to-point
Operating voltage 3.3V/5V
Connector screw terminal
Protection clamp protection diode, over-voltage/negative-voltage proof, shock resistance
Transmission mode point-to-point
PWR red power indicator, light up when there is USB connection and voltage is detected
TXD green TX indicator, light up when the USB port sends data
RXD blue RX indicator, light up when the device ports send data back
Temperature -15℃ ~ 70℃
Humidity 5%RH ~ 95%RH
Operating system Windows 10 / 8.1 / 8 / 7 / XP

Part List

USB TO RS232/485/TTL 1
USB cable 1


HSCODE 8543709990
USHSCODE 851770000
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Customer Reviews
  1. Good serial converter
    It's a robust little unit. TTL out at 5v and 3V works well. The RS232 is good.

    No problems installing drivers, it's FTDI.

    Review by

    Posted on

Product Faqs

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  • Is possible to buy this item without the brand marking on the top side?
    Question by: Lubos on 2019-03-22 08:20:30

    Hi Lubos, We need to discuss with the supplier, could you please tell us how many do you want? You can contact us by Thanks for your time and interest in Seeed

    Answer by: admin on 2019-03-25 09:31:30
  • The description for this product says "isolated converter" however, I have read all the detail and cannot see any description of which ports and signals are isolated from each other? ie USB ground to RS232 ground? USB ground to RS485 ground? etc
    Question by: Kym Newbery on 2019-01-04 03:32:21

    Hi there, the USB TO RS232/485/TTL uses FT232RL, built-in power isolation, ADI magnetic coupling isolation and TVS protection circuits. thanks.

    Answer by: admin on 2019-01-09 03:23:07