a facsimile machine comprises a reader having a plurality of read modes for reading a text sheet , a memory for storing image data , a transmitter for transmitting the image data , and a controller for selectively transmitting the read image data through the memory or without routing it through the memory in accordance with the read mode of the the reader . the transmitter has a plurality of modes , including halftone and binary image modes . the facsimile machine is advantageous in providing efficient transmission of data , and may be used , for example , in providing an efficient scheme when a busy signal is received at the calling station .