Epson 1170 User Manual page 125

interface Specifications
Note:
The column heading "Direction" refers to the direction of
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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.
All interface conditions are based on TTL level. Both the rise
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and fall times of each signal must be less than 0.2
microseconds.
Data transfer must be carried out by observing the ACKNLG
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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