Epson DM-D210 Technical Reference Guide - Page 103

DM-D Connector (RS-232) Type: RJ-45 Connector 1 8 Appendix Pin assignments Pin Signal Number Name 1 FG 2 TXD 3 RXD 4 DSR 5 RTS 6 SG 7 PS 8 PG Signal Direction Function - Frame ground Output  Stand-alone connection:  Transmits data to the computer from the this product.  Pass-through/Y-type connection *1:  Transmits data to the TM printer from the computer. Input Receives data from the computer. Input Output Indicates whether the computer/TM printer is ready to receive data.  Stand-alone connection *1  [SPACE]: The computer is ready to receive data.  [MARK]: The computer is not ready to receive data.  Pass-through connection *1  [SPACE]: The computer is ready to receive data.  [MARK]: The computer is not ready to receive data. This indicates whether the display is ready to receive data. *2  [SPACE]: The display can receive data. DTR goes to SPACE under the following conditions:  When the display first becomes ready to receive data after power on.  When the self-test has ended.  When the remaining space in the receive buffer becomes 50 bytes or more after having been 40 bytes or less.  [MARK]: The display cannot receive data. DTR goes to MARK under the following conditions:  The period from when power is turned on to when the display first becomes ready to receive data.  When the self-test is executed.  When the remaining space in the receive buffer becomes 128 bytes or less (buffer-full state).  When DSR MARK is on, if the TM printer is selected by a peripheral device command. - Signal GND - Power supply terminal - Return wire for power 1 For a Y-type, pass-through, and standalone connection, refer to the "System Outline" on page 15 for details. 2 When using the status confirmation commands for ESC/POS command to change the DTR signals to MARK sta- tus, the function differs from the signal function to show whether or not the display is ready to receive data. 103