RS422 / RS485 to TTL Converter / TTL Repeater (Industrial)

TTL-485_422-2 + PWR-5_US-2

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The TTL-485_422-2 is a compact, rugged, industrial-grade, bi-directional RS485 / RS422 to TTL converter, which can be used to convert 2-wire RS485 or 4-wire RS485 / RS422 to 5VDC TTL-compatible levels and vice versa. It is also ideal for extending the full-duplex unbalanced TTL distance. This industrial RS485 / RS422 to TTL converter supports multi-drop RS485 / RS422 networks and can be used to communicate with one loop of up to 64 units of RS485 / RS422 devices. It operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC), and features 600W surge protection and 15kV static protection. The unit is powered from an external 5VDC regulated power supply (included); and it supports data direction auto-turnaround, which automatically enables the RS485 transceiver when data is present on the TTL side. Therefore, it requires no software drivers or flow control, making the unit a highly reliable and truly plug-and-play device. The built-in 120-Ohm terminator (for system reliability and easy installation) can be turned ON or OFF through a simple jumper setting, thus making the unit an ideal solution for all types of installations.

CommFront's products quality is ensured by our ISO-9001 quality control system (Cert No. SG12/04213, strictly certified by SGS), and we back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee.


  • Rugged industrial-grade RS485 / RS422 to TTL converter / TTL repeater.
  • Converts 2-wire RS485 or 4-wire RS422 to 5V TTL and vice versa.
  • Ideal for extending the full-duplex unbalanced TTL distance (up to 4000ft/1.2km).
  • External 5VDC powered (included).
  • Industrial grade enclosed in a rugged, rustless ABS housing.
  • 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
  • Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
  • Plug and play (Hot-pluggable; Data format Auto-sensing & Self-adjusting).
  • Data direction auto-turnaround, no software drivers or flow control is required.
  • Built-in selectable 120Ω terminator for system reliability and easy installation.
  • Built-in 600W surge protection, 15kV static protection and circuit protection.
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
  • 5-year manufacturer's warranty.


Part Number: TTL-485_422-2
Compatibility:  EIA/TIA RS-485 standard and TTL level
Power Source: +5VDC (±5%) Regulated Power Supply (included)
Current Consumption: Less than 30mA
Baud Rates: 300 to 115,200bps (Auto-sensing & Self-adjusting)
Distance: RS485 / RS422 side: Up to 4000ft (1.2km) at 19,200bps; TTL side: 10ft (3m)
Connector: TTL Side: DB-9 Male; RS-485 / 422 Side: DB-9 Male; Termination Board (TTL): DB-9 Female and a 3-way Terminal Block; Termination Board (RS-485/422): DB-9 Female and a 6-Way Terminal Block
Maximum Number of drops: 64
End of Line Terminator: 120Ω (built-in, selectable)
Surge protection: 600W
Static protection (ESD): Up to 15KV
Dimensions (H x W x D): 0.63 x 1.3 x 4.6 in (16 x 32 x 118 mm) (with Termination Boards)
Weight: 1.8 oz (51 g) (with Termination Boards)
Operating Temperature: -40ºF to 185ºF (-40ºC to 85ºC)
Operating Humidity: Up to 90% RH (no condensation)





CommFront products are strictly certified by SGS and/or TUV - the Nationally Recognized Testing Laboratories [NRTLs] in North America (approved by OSHA) and the Notified Bodies in the European Union. Learn More




CommFront products are designed and manufactured to ISO 9001 standards. Our quality control system is strictly certified by SGS (Cert No. SG12/04213). Learn More




CommFront products have been proven to be reliable. We back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee. Learn More

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