Epson POS display

Notes from Botond Zoltan Horvath:

The RJ45 socket on the display's control board is connected to an RS232 driver, which expects a +/-15V input signal level.

Instead, a wire is soldered to the UART line between the driver and the microcontroller and fed with a 3.3v TTL UART signal. The board's input voltage is 12v and takes approximately 300ma. Please take a look at the wiring in the attached picture.

The DIP switch controls baud rate and command modes, as described on page 29 of dm-d110_d210_trg_en_revd.pdf. I had no. 8 ON (self-test), and all others OFF. This setting means 9600 N 8 baud and the POS7300 command table.

POS7300 commands are described on page 23 of OCD100_User_Manual_V1_0.pdf. Additional descriptions of commands can be found on this website:

https://download4.epson.biz/sec_pubs/pos/reference_en/escpos_dm/commands.html

Example command to write text on the first line:

I just remembered that I also bridged R8 on the PCB (next to the RJ45 socket) to turn it on with a disconnected power switch.

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