How do I serialize a struct of 8bit integers for socket programming?

I have a struct that has 5 unsigned 8 bit integers that mimics a frame with 5 packets. After researching, I know need to serialize the data, field by field, especially since I am sending from a Windows machine to a Linux machine and back.

here is my struct:

typedef struct pressure{
    UINT8       a;
    UINT8       b;
    UINT8       c;
    UINT8       d;
    UINT8       e;
}pressure;

The issue is I cant use htons() since my members must be 8 bits. How do I manually serialize this? It would be greatly appreciated if you could provide a short code sample that shows how to serialize and what to pass to send().