TTL to RS485 Converter with Galvanic Isolation Half-Duplex Communication
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Galvanically Isolated TTL to RS485 Converter
(Half-Duplex, Lightning and Surge Resistant)
The converter allows converting a TTL signal (3.3 V–5 V) into a balanced RS485 signal, ensuring stable and reliable data transmission in half-duplex mode. Thanks to built-in galvanic isolation and advanced protection (surge and lightning protection, ESD protection), the device guarantees high interference immunity, which is particularly effective in industrial environments and applications requiring safe, long-distance data transmission.
Key Features
- TTL to RS485 Conversion: Compatibility with 3.3 V–5 V TTL signals; supports half-duplex.
- Galvanic Isolation: Separation of power and signals ensures high reliability and immunity to interference.
- Surge and Lightning Protection: Built-in protective diodes (TVS), self-healing fuse, surge protection circuit, and 6 kV ESD.
- Simple Integration: Compact dimensions and castellated holes facilitate embedding the converter into various devices.
- Power Stability: Built-in isolation on the power line and overvoltage protection guarantee fault-free operation without the need for additional power sources.
- Long Transmission Range: In RS485 mode, communication is possible up to 1.2 km (point-to-multipoint up to 32 nodes; use of repeaters is recommended above 16 nodes).
Pinout and Indicator Description
Indicators:
- R (RXD): LED indicates data reception via the TTL port
- T (TXD): LED indicates data transmission via the TTL port
- PWR: Power LED, lights up when voltage is connected and detected
Connectors and Pins:
- Left side: PE (RS485 ground), B− (RS485−), A+ (RS485+)
- Right side: GND (ground/TTL), RXD (TTL reception), TXD (TTL transmission), VCC (power input 3.3 V–5 V)
Multi-level Protection – Safe and Stable Operation
Power and Signal Isolation protects the device from interference and potential differences. TVS diodes effectively suppress surges and voltage spikes, increasing resistance to lightning and electrostatic discharge. The self-healing fuse protects against current overload, allowing operation to resume after the fault has been cleared.
Specification
- Product Type: Galvanically isolated TTL to RS485 converter
- Power Supply: 3.3 V – 5 V
- Protection: Overvoltage protection
- Ports: TTL
- RS485: Transmission range: up to 1.2 km (point-to-multipoint, up to 32 nodes; use of repeaters is recommended above 16 nodes)
- Load Resistor: 120 Ω (enabled by soldering)
- Surge protection, 6 kV ESD
- Dimensions: 42.8 x 15.2 x 4.75mm
Package Contents
- TTL to RS485 Converter with Galvanic Isolation, Half-Duplex Communication TTL TO RS485 (C) Waveshare 27479 x 1
