Brother HL-2400C Service Manual page 98

<HSYNC>
Horizontal synchronization signal for printing
<VIDEO>
Video data signal
<COMMAND>
Command signal sent from the controller to the engine
<STATUS>
Status signal sent from the engine to the controller
Fig.4-38 shows the timing of each signal after the power switch is turned on.
Power On
210s MAX.
IREADY-N
PRREQ-N
0.1sec. MIN.
15sec. MAX.
VSYNC-N
VIDEO-P
VSYNC-N
15us MIN.
10ms MAX.
HSYNC-N
VIDEO-P
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.
COMMAND
STATUS
(K) data (C) data
417.781us
1st line 2nd line
Fig.4-38
Stop bit
Start bit
Parity bit
LSB
MSB
Fig.4-39
IV-49
1.0sec. MAX.
3.75s
(M) data
56.296ns
1dot
P
8ms (TYP)
30ms (MAX)
LSB
Start bit
3.0sec. MAX. for Continuous Printing
(Y) data
Last line
MSB
P
Parity bit
Stop bit