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WSAL23996 – USB TO RS232 – 485 – 422 – TTL/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare WSAL23996 is an industrial-grade isolated USB-to-serial converter based on the FT232RNL chip. It supports conversion from USB to RS232, RS485, RS422 and TTL, with integrated power and signal isolation, TVS protection and a self-recovering fuse.

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Technical overview

  • Chip used: original FT232RNL for fast, stable and reliable communication
  • Supported conversions: USB to RS232, RS485, RS422 and TTL; no inter-conversion between the serial standards
  • RS232: DB9 connector, point-to-point, baud rate 300 bps to 921600 bps, TVS diode for surge and ESD protection
  • RS485/RS422: screw terminals, hardware-based automatic direction control, baud rate 300 bps to 2 Mbps
  • RS485 supports up to 32 nodes (repeater recommended above 16); RS422 up to 256 nodes
  • Integrated 120-ohm matching resistors for RS485/RS422, enabled by default; can be disabled via jumper
  • TTL: screw terminals with TXD, RXD, GND, 3.3 V/5 V; voltage translator switchable to 3.3 V or 5 V
  • Protection circuitry: 200 mA self-recovering fuse, TVS rectifier diodes, lightning and ESD protection (up to 15 kV for RS485/422)
  • Aluminum-alloy case, suitable for wall-mount and DIN-rail mount
  • Operating temperature -15 °C to 70 °C, humidity 5 % to 95 % RH
  • Indicator LEDs: PWR (red) indicates USB power; TXD lights when transmitting, RXD when receiving

Notes and version constraints

  • Exact driver file names and download links are not fully specified in the source; consult the current FTDI driver page
  • The exact location of the jumper to disable the 120-ohm resistors requires opening the case; without a photo, the precise spot cannot be unambiguously described
  • Maximum power consumption is not stated in the source
  • For long distances over RS485/RS422, a repeater is recommended; the exact count depends on cable type and environment

Source and revision record

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