RS232 to TTL Converter / Adapter (Industrial / Port-Powered)


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The TTL-232-1 is a compact, rugged, industrial-grade, port-powered RS232 to TTL converter / adapter that can be used to convert RS232 to 5V TTL / CMOS compatible levels and vice versa. This industrial RS232 to TTL converter / adapter operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC), and features 600W surge protection and 15kV ESD static protection. The unit is efficiently powered from the RS232 data line, and the full-duplex RS232 to full-duplex TTL conversion eliminates the need of auto-turnaround feature. This TTL to RS232 converter / adapter also comes with the auto-sensing and self-adjusting features, which automatically adjust baud rate, parity, stop bit and other COM port parameters to the devices that it is connected to. Therefore, it requires no external power, manual settings or software drivers, making the unit a highly reliable and truly plug-and-play device for both commercial and industrial applications.

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 port-powered RS232 to TTL / TTL to RS232 converter / adapter.
  • Converts RS232 to 5V TTL / CMOS and vice versa.
  • Port-powered, no external power or RTS, DTR required.
  • 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).
  • No software drivers, flow control, DIP switch or jumper settings required.
  • 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-232-1
Compatibility:  EIA/TIA RS-232C standard and TTL 5V level
Power Source: Port power from RS232 data line
Current Consumption: Less than 10mA
Baud Rates: 300 to 115,200bps (Auto-sensing & Self-adjusting)
Distance: RS232 side: 16ft (5m); TTL side: 10ft (3m)
Connector: RS232 Side: DB-9 Female; TTL Side: DB-9 Male; Termination Board: DB-9 Female and a 3-Way Terminal Block
Surge protection: 600W
Static protection (ESD): Up to 15KV
Dimensions (H x W x D): 0.63 x 1.3 x 3.5 in (16 x 32 x 88 mm) (with Termination Board)
Weight: 1.27 oz (36 g) (with Termination Board)
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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