Brother HL-3450CN Series, Руководство по обслуживанию

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CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS
4-50
Fig.4-38 shows the timing of each signal after the power switch is turned on.
Power On
IREADY-N
PRREQ-N
VSYNC-N
VSYNC-N
HSYNC-N
VIDEO-P
VIDEO-P
210s MAX.
0.1sec. MIN.
15sec. MAX.
15us MIN.
10ms MAX.
1.0sec. MAX.
3.0sec. MAX. for Continuous Printing
(K) data
(C) data
(M) data
(Y) data
3.75s
417.781us
1st line 2nd line Last line 1dot
56.296ns
Fig. 4-38
The COMMAND signal and STATUS signal are the signals that are used to transfer the data
between the controller and the engine, which perform as a half-duplex asynchronous serial
communication. Refer to Fig.4-39.
8ms (TYP)
30ms (MAX)
P
P
LSB
MSB
LSB
MSB
Fig. 4-39
NOTE:
x
Based on “Asynchronous Communication” method.
x
Command/Status communication must keep the “Handshake Rule”.
x
Baud rate is 9600 bps.
x
Frame format: - one (1) start bit,
- eight (8) data bits
(Start bit side is LSB, Parity bit is MSB),
- one (1) odd parity bit,
- one (1) stop bit.
x
The video controller has to send an “Initialize Command” to the engine controller after
power on in order to establish communication.
The power for the Main PCB is supplied through the engine interface connector.
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