With The Parallel (Ieee1284) Interface; With The Usb Interface - Epson TM L90 Technical Reference Manual

3.2.2 With the parallel (IEEE1284) interface

TM printer is connected to the host PC via parallel port mounting parallel interface board
(UB-P02II). DM-D is connected to the host PC via serial port.
Connection procedure
1. Press the connector on the end of the interface cable firmly onto the interface connector
located on the connector panel.
2. Press down the clips on either side of the connector to lock it in place.
3. For interface cables equipped with a ground line, attach the ground line to the screw hole
marked "FG" on the printer.
4. Connect the other end of the interface cable to the host computer.

3.2.3 With the USB interface

A USB interface TM printer is connected to the host PC via USB. The second TM printer can be
connected via a self-powered USB hub from the printer connected to the host PC.
<Example>
*1 Only the printer with the USB hub function allows another TM printer to be connected using a USB
cable.
*2 EPSON does not supply the port driver or similar program necessary to control the USB interface
printer with the ESC/POS commands. Control it with the driver (APD, OPOS).
Rev. B
TM-L90/TM-L90 with Peeler Technical Reference Guide
Connecting to the Host Computer and Options 3-5