Communication to cash register

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Communication to cash register



I am trying to code cash register app using node.js. My hardware is:
Datecs DP-55 plus model ECR
I can connect it via rs232 serialport or tcp/ip connection. I want to send products cart info (product name, price) to ECR and it should print cheque.
I have tried to search over internet for info, tried to contact datecs support for help, but no one tried to help me.
Maybe anyone have tried to code something similar? or understand how I should send commands to hardware similar to this and could help me? all I have is .doc file with some communications explained, but I cant understand how should I send this data over serialport or tcp/ip connection.



Communication protocol .doc file:
https://drive.google.com/file/d/0B82E_2zyuc11WTlhTi0waXpmcGEtbGdERmpzQk9hS0owYjdR/view?usp=sharing





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