Brother HL-2400C Service Manual page 99

Note:
Based on "Asynchronous Communication" method.
Command/Status communication must keep the "Handshake Rule".
Baud rate is 9600 bps.
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.
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.
IV-50