Epson Stylus Pro XL+ [555/573] Optional serial interfaces

Epson Stylus Pro [555/573] Optional serial interfaces
Optional Serial Interfaces A-37
Optional Serial Interfaces
Several optional serial interfaces are offered for the EPSON printer line. The pin
assignments and signal direction from the printer side of the Female DB-25 are described in
the table below:
Optional serial interface pin assignments
Pin Signal Name Dir. Description
1 Protective Ground n/a Chassis Ground
2 Transmitted Data (TXD) Out Transmitted Data
3 Received Data (RXD) In Received Data
6 Data Set Ready (DSR) In This signal must be at the positive EIA level for the
printer to receive data.
7 Signal Ground In Return path for data and control signals
8 Data Carrier Detect
(DCD)
In This is the same signal as DSR at pin #6, DCD and
DSR can be held at “SPACE” internally. The signal
polarity is factory set to “SPACE”
11 Reverse Channel Out This signal is at the positive EIA level when the printer
is ready to accept data entry, and at the negative EIA
(= 2nd RTS) level when the printer is not ready. The
user can invert the polarity of this signal via DIP
switch.
17 TTY-TXD Out Low impedance (“MARK”) between pins 17 and 24 or
X-ON signal sent across pins 17 and 24 indicates that
the printer is ready to accept data. High impedance
(“SPACE”) or X-OFF signal being sent indicates that
the printer is busy. The operator can invert the polarity
via DIP switch.
20 Data Terminal Ready
(DTR)
Out See Pin 11 for description
23 TTY-TXD Return n/a
24 TTY-TXD Return n/a See Pin 17 for description
25 TTY-RXD In Input data when using serial current loop.

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