The optoTTL b-12 system can be used for the optical transmission of 12 volt 16 channels digital signals or for overcoming greater distances or for eliminating problems with mass potentials. Manufactured by
12V RFID Barcode 2D QR Code Reader Access Control Reader Wiegand TTL RS232 RS485 Interface - allinbest.com
Ttl To Rs232 Board Converter Module, 12V
Laserland Power Supply Driver 450nm 445nm 473nm Blue Laser Diode TTL 12V 1.2A 50mw-1000mw
Laser Diode LD driver board with TTL modulation current 1A - 2A DC 12V voltage current adjustable 405nm 445nm 450nm - AliExpress