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Green circuit board with terminal blocks and DIN rail clip

WaveShare

WaveShare Galvanic Isolated Rail-Mount TTL to RS422 Converter Adapter

SKU CH-74AN-H8QTY

Galvanically isolated rail-mount adapter converts TTL signals to balanced differential RS422 with onboard TVS surge suppression and resettable fuse protection for industrial long-distance

  • Converts TTL to balanced differential RS422 for long-distance communication
  • Galvanic isolation protects power and signal lines from interference
  • Onboard TVS diode suppresses surge and transient voltage spikes
  • Resettable fuse and protection diodes guard against over-current and over-voltage
  • Rail-mount design enables flexible multi-unit serial server stacking

TTL to RS422 signal conversion

This rail-mount adapter converts TTL signals into balanced differential RS422 for interface conversion and long-distance communication. It suits industrial automation and IoT projects that need reliable serial links. Multiple nodes can be expanded across a network. The module fits DIN-rail enclosures for tidy cabinet integration.

Isolation and protection features

Onboard power and signal isolation delivers stable isolated voltage with strong anti-interference performance. A TVS suppressor clamps surge and transient spike voltages while a resettable fuse and protection diodes guard against over-current and over-voltage events. These safeguards keep the link stable in electrically noisy environments.

Communication reach and limits

The adapter handles point-to-point, point-to-multipoint and cascaded long-distance links between hosts or between a host and MCU peripherals. It is not suited for applications that require TTL-level signalling without conversion. Builders needing fibre-optic or wireless backhaul must look elsewhere.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $31.99
Pricier than about 76% of the 354 comparable items (median $21.99).

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Specifications

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Questions about this item

What happens to the RS422 output when the TTL input is driven continuously at high speed?

The galvanic isolation and onboard TVS diodes maintain signal integrity and suppress transient spikes during sustained high-speed TTL to RS422 conversion.

How much heat does the adapter generate when mounted on a DIN rail inside a closed cabinet all day?

Onboard power and signal isolation with a resettable fuse keeps current and voltage stable, limiting heat rise during continuous operation.

Which power source must already be present on the rail for this converter to operate?

The module draws its isolated supply from the rail-mounted bus, so a compatible DC rail voltage must be provided by the existing installation.

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