Brother International HL-2600CN Service Manual - Page 98

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.4-40. P LSB MSB 8ms (TYP) 30ms (MAX) LSB MSB P Fig.4-39 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-47