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WSAL15817 – USB TO RS232 – 485 – 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

Technical guide for the Waveshare interface converter: USB is converted to RS232, RS485 or TTL; simultaneous conversion between the serial standards is not supported.

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Technical overview

  • Supported directions: only USB to RS232, RS485 or TTL. The reverse direction and direct conversion among RS232, RS485 and TTL are not supported
  • VCC pin: selectable 5 V or 3.3 V (max. 50 mA) to power connected devices; leave unconnected if the device has external power
  • Isolation voltage: 5 V (industrial isolation)
  • RS232 signal levels: logic 0 at +5…+15 V, logic 1 at −5…−15 V (standard RS232 interface)
  • TTL and RS232 are full-duplex; test by shorting RXD and TXD. RS485 is half-duplex; test using an external USB-to-RS485 device
  • For RS485 proximity communication anomalies (received data > 0): remove the 120-ohm termination resistor
  • RS485 grounding: not mandatory but a GND connection is recommended for long-distance links, stability and anti-interference
  • The module is a hardware-level interface switch: no Modbus protocol support, but it can connect to Modbus devices via its onboard RS485/RS232/TTL interface

Notes and version constraints

  • No commands present in the source; commands array left empty
  • Source contains unresolved placeholders such as {{{name3}}} through {{{name6}}} and {{{5}}}; some product names and answers may be missing
  • Exact mounting hole size is given as a placeholder in the source and remains unspecified
  • Driver installation per OS must be confirmed manually; no automatic driver detection
  • Modbus function codes and data format require separate protocol knowledge; the module itself does not implement Modbus

Source and revision record

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