WSAL23949 – USB TO RS485 – 422/en
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 USB to RS485/RS422 converter is an industrial-grade isolated device featuring FT232RNL and SP485EEN chips. It supports baud rates from 300 bps to 3 Mbps, provides automatic direction control, and includes multiple protection circuits.
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Technical overview
- Enclosure: Industrial rail-mount ABS case, suitable for 35mm DIN rail
- Dimensions: 81.9 × 54.0 × 32.0 mm
- USB port: USB-B connector, powered at 5V
- Transmission distance: About 1200m at low baud rates
- RS485 interface: A+, B-, PE; RS422 interface: TA, TB, RA, RB, PE
- Automatic hardware direction control without manual intervention
- Protection circuits: TVS, self-recovery fuse, ESD protection (15kV), lightning/surge protection (600W)
- Two converter units are required for testing
- LEDs: PWR (red) indicates power, TXD (green) indicates transmitting, RXD (blue) indicates receiving
- Operating temperature: -15°C to 70°C
Notes and version constraints
- The source contains contradictory statements about the 120Ω resistor: The “120R Matching Resistor Setting Description” section says it is disabled by default, while the FAQ answers state it is enabled by default. Please verify the actual jumper state on-site.
- The source page references external links to drivers and files that are not included in the source. Exact download paths must be confirmed manually.
- Exact driver installation requires access to the official FTDI driver portal, which is not available in the source file.
Source and revision record
- USB TO RS485/422 - Waveshare Wiki
- Source revision: 108980
- Captured: 2026-09-04T03:37:53+00:00
- SHA-256:
18f90798d06ffb094852d1cf1062e71ba0255af19fbc479ea48ae46cf2e48bdb