Interface Specifications

Notes:

1.The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

2.“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.

3.All interface conditions are based on TTL level. Both the rise and the fall times of each signal must be less than 0.2 micro- seconds.

4.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.)

Interface timing

The figure below shows the timing for the parallel interface.

BUSY r

ACKNLG

DA TA

 

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