Epson LQ-1050X User Manual page 265

The column heading "Direction" refers to the direction of signal
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flow as viewed from the printer.
"Return" denotes the twisted-pair return, to be connected at
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signal ground level. For the interface wiring, be sure to use a
twisted-pair cable for each signal and to complete the connection
on the return side. These cables should be shielded and
connected to the chassis of the host computer and the printer.
All interface conditions are based on TTL level. Both the rise and
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the fall times of each signal must be less than 0.2 microseconds.
Data transfer must be carried out by observing the ACKNLG or
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BUSY signal. Data transfer to this printer can be carried out only
after receipt of the ACKNLG signal or when the level of the
BUSY signal-is LOW.
Interface timing
The figure below shows the timing for the parallel interface.
Technical Specifications
8-12