104
Appendix
DM-D Connector (RS-232)
Type: RJ-45 Connector
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.
Pin
Number
Signal
Name
Signal
Direction
Function
1FG- 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 less
(buffer-full state).
∗ When DSR MARK is on, if the TM printer is selected by a peripheral device
command.
6SG- Signal GND
7 PS - Power supply terminal
8PG- Return wire for power
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