Interfacing of CO2 sensor module with Arduino ATMega328 through ttl

Dear Sir,
I am using CO2CGM Module. I have included softwareserail.h library. As per the guideline, i need to send a command 80h 02h 00h 7Eh to co2 module to get the data. How could i write the mentioned code in arduino. As it is written in assembly, if i m not wrong.
I would really appreciate if u can provide me the arduino code for mentioned one (80h 02h 00h 7Eh).

thanks,
Om