Epson DM-D500 Series, Technical Reference Manual

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DP-501
The connectors on the DP-501 are as indicated below.
Connector for computer connection
This is the connector for connecting to a computer.
Pin assignments
(*1) Make sure to use either the RTS or the DTR terminal. Otherwise, the built-in RS-232 driver IC may be broken.
(*2) This signal is connected to the DTR terminal of the printer directly.
Pin Num-
ber
Signal
Name
Signal
Direction
Signal Function
1 FG - Frame ground
2 TXD Output (1) In a pass-through or Y connection, data sent from the printer to the host
(2) In a stand-alone connection, data sent from the display to the host
3 RXD Input Data received from the host (Host -> display)
4 (*1) RTS Output Same signal as DTR.
6 (*2) DSR Input Indicates whether or not the host is ready to receive data.
[SPACE] The host is ready to receive data
[MARK] The host is not ready to receive data
7 GND - Signal GND
20 (*1) DTR Output Indicates whether or not the display is ready to receive data. (*2)
[MARK] The display is not ready to receive data
The display enters the MARK status in the following cases:
(1) During power-on initialization
(2) During self-test
(3) The empty capacity of the receive buffer is 128 bytes or less
(4) When DSR enters the MARK status on printer selection
[SPACE] The display is ready to receive data
The display enters the SPACE status in the following cases:
(1) When power-on initialization finishes
(2) When self-test finishes
(3) When the empty capacity of the receive buffer recovers to 256 bytes or more
from 128 bytes or less
25 RESET Input Reset signal for the printer
Connector for printer connection
DM-D connector
Connector for computer connection
Connector for power supply unit connection
Connector for power extension cable connection