Appendix DM-D Connector (RS-232) Type: RJ-45 Connector 1 8 Pin assignments ∗ 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. 104 Pin Number Signal Name Signal Direction Function 1 FG - Frame ground 2 TXD Output • Stand-alone connection: Transmits data to the computer from this product. • Pass-through/Y-type connection *1: Transmits data to the TM printer from the computer.
3 RXD Input Receives data from the computer. 4 DSR Input 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. 5 RTS Output 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 les s (buffer-full state). ∗ When DSR MARK is on, if the TM printer is selected by a peripheral device command. 6 SG - Signal GND 7 PS - Power supply terminal 8 PG - Return wire for power