Epson LQ 870 User Manual - Page 125

and fall times of each signal must be less than 0.2, All interface conditions are based

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interface Specifications Note: l The column heading "Direction" refers to the direction of signal flow as viewed from the printer. . "Return" denotes the twisted-pair return, to be connected at 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. l All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds. l Data transfer must be carried out by observing the ACKNLG or 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. 7-12 Technical Specifications

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interface Specifications
Note:
l
The column heading “Direction” refers to the direction of
signal flow as viewed from the printer.
.
“Return” denotes the twisted-pair return, to be connected at
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.
l
All interface conditions are based on
TTL
level. Both the rise
and fall times of each signal must be less than 0.2
microseconds.
l
Data transfer must be carried out by observing the ACKNLG
or 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.
7-12
Technical Specifications