What type of serial interface do these have? 25-pin RS232C?

The serial interface of the printer is compatible with RS-232, its connector is 25PIN female D type. https://www.crs-usa.com/Files/CRS/Documents/BTP-R880V/BTP-R880NPV_User's%20_Manual_CRS_V1.0.pdf PAGE 16

wich size of paper match to that printer?

Hi For this printer and the size is 80*80

Do you need a software download to install? If so where can we get the software download?

It depends with your POS system, sometimes they have the driver embedded. Often you will need to install the driver, which you can find online fairly easely. Just type SNBC BTP-R88NP driver on google and you should find a place where you can download the drivers.

SNBC BTP-R880NP

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