Function read_regs 

pub async fn read_regs<T: Transport, const N: usize>(
    t: &mut T,
    space: AddressSpace,
    off: u16,
) -> Result<[u16; N], Error<T::Error>>

Read a point window into a fixed-size register array. Coil/discrete spaces read a single bit into word 0 (parity with the dynamic facade).