Chapter 4 Application Development Information Y-type Connection A Y-type connection allows you to connect to the customer display via a TM printer from the computer’s serial port. The data flow when the Y-type connection is as follows. Computer Transmit data from the computer Transmit data to the computer from the TM printer Transmit data to the TM printer DM-D110 DM-D210 Power supply • The data from the computer is transmitted to the TM printer and the same data is transmitted to the cus- tomer display with the Y-type connection. • The Select peripheral device(s) command of ESC/POS distinguishes between the data for the customer dis- play and the data for the TM printer. 4 90 TM Printer