Function build_resp_bit_reads 

pub fn build_resp_bit_reads<const MAX_QTY: usize, B: BitRead>(
    out: &mut [u8],
    unit_id: u8,
    func: u8,
    start_addr: u16,
    quantity: u16,
    bits: &B,
) -> usize

组装 FC01 / FC02 响应：