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 microseconds.

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)

Data Transfer Sequence

Interface timing

Figure G-1 shows the timing for the parallel interface.

Printing enabled/disabled signals and control conditions

Table G-2 on the next page shows the relationship between printing being enabled or disabled, and the on-line/off-line condition, the printer select signal (SLCT IN), and the receipt of data on/off control character, DC1 /DC3.

G - 6

Technical Specifications