I've a thermal printer which has TTL, RS232 & a four pin interface. I want to connect it to an Arduino and take printouts with it. It has the following pinouts:
RS232 & TTL
Another Four Pins Interface
I've tried printing using the serial communication by sending serial print commands from the TX of the Arduino to the RXD of the printer but for some reason it did not work.
How can I connect it to an Arduino and write a program for it?