Epson DM-D210 Technical Reference Manual page 92

DM-D Connector (RS-232)
Type: RJ-45 Connector
Pin assignments
Pin Signal
Number Name
1 FG
2 TXD
3 RXD
4 DSR
5 RTS
6 SG
7 PG
8 PG
1 For a Y-type, pass-through, and standalone connection, refer to the
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.
92
1
Signal
Direction
- Frame ground
 Stand-alone connection: 
Output
Transmits data to the computer from the this product.
 Pass-through/Y-type connection
Transmits data to the TM printer from the computer.
Input Receives data from the computer.
Input Indicates whether the computer/TM printer is ready to receive data.
 Stand-alone connection
 [SPACE]: The computer is ready to receive data.
 [MARK]: The computer is not ready to receive data.
 Pass-through connection
 [SPACE]: The computer is ready to receive data.
 [MARK]: The computer is not ready to receive data.
Output This indicates whether the display is ready to receive data.
 [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
8
Function
*1 : 
*1
*1
"System Outline" on page 15
*2
for details.