How to read device ID?

Hi

I'm using PLC-TMDSPLCKIT V3.

I want to know how to read this device ID?

And I try to write some code to read the PLC's product id.

I refer to PRIME Host Message Protocol Specification this datasheet.

In p.59, it talks about GET_INFO(Meaage Type 0x14), and I want to get the information inside of it.

And in p.69, I try to write the code.

MSG_TYP = 0x14;   //GET_INFO

MSG_ORG = '1';    //originated from PLC

MSG_RPY = '0';     //need reply message

MSG_BDY = uint16_t blob_id;     // blob id to identify the blob

                      uint16_t blob_len;     // length in bytes of blob to read

                      uint16_t blob_addr;     //start address of the blob, only exist when blob_id=4

I don't know what else I need to write in the code and my code is use it right or anything wrong.

Any suggestion or information would be appreciated

Thanks,

Wayne