Citizen iDP-3550 - Timing Chart; Data Receiving Control

9.3.3 Timing Chart
(1) Data input and printing timing
T1, T2, T3 : 0.5 µs MIN
T4 : 270 ns MAX
T5 : 2.3µs TYP
T6 : 500 ms MIN (At power-on)
9.3.4 Data Receiving Control
When the BUSY signal is at "LOW," the printer can receive the data from the host, but when at "HIGH," it
cannot.