Bose LS 20-30 free download

File name CD20_Serial_Control_Rev4.pdf

REVISION 4 9/27/00 CD20 REMOTE CONTROL VIA SERIAL PORT CD20 REMOTE CONTROL VIA SERIAL PORT 1.0 Scope: Lifestyle 20, Lifestyle 25, and Lifestyle 30 share a common music center known internally at Bose as CD20. This document describes how to control CD20 using its RS232 serial port. Introduction: The CD20 serial port is used for several different purposes, some of which have different protocols. To accommodate the various uses and protocols, there are seven different serial port modes. (See Table 1) Of the seven modes, only the TAP (Test Access Port) mode should be used for CD20 control in consumer applications. Serial Port Characteristics: Firmware Revision Number: Serial port remote control of CD20 is only available on CD20 units with Юrmware revisions 6.1 or later. To determine whether the version is correct : With the unit OFF, press and hold these three keys simultaneously: Skip down, Tune down, source select (press last). The display should respond with something like "Crev 6.1" If you get no response or you get Crev 6.0, then the software is deЮnitely not the version you want. 2.0 3.0 3.1 3.2 Circuit access: The serial port access is made through SER-IN (RING) and SER-OUT (TIP) pins of a standard 3.5 mm stereo phone jack (labeled SERIAL DATA on the back panel of the CD20). These pins are connected to the microprocessor through a protection circuit (including a 330 ohm serial resistor). The SER-IN also has a 10 K ohm pull-up to the +5V, so if a signal is not connected then the serial input is in an idle mode. Physical layer: The electrical signal on the serial port is a 5V RS-232 signal (be careful not to connect directly to a PC RS232 port - use a RS232 to TTL converter). Idle state is 5V. The baud rate is switchable between 1200 or 9600 baud. (Default is 1200 baud after power-up, since there is no hardware UART in the Toshiba micro used in the CD20. The 1200 baud is the recommended baud rate - but the system can handle 9600 baud also, although the bit error rate is higher). Since the UART function is implemented by software (there is only one timer which can be assigned for this task) the communication is only HALF DUPLEX. The raw bitstream is: 1 start bit, 8 bits data, No parity, 1 stop bit. Power-up sequence: After each power-up (about 300 msec after the hardware reset) or after any software reset is applied to the CD20 (e.g., send RST command through the serial port, or give reset from the keypad -STORE+ERASE+ON) the serial port sends out an '*' (ASCII 0x2A) and goes to IDLE mode. The external controller must explicitly invoke the desired serial mode (see section 5). By monitoring the serial port any reset event or power break of CD20 always can be detected (watch for the '*'). 3.3 3.4 CD20 Serial Control 2 REV 4 4.0 Serial Port Modes: Table 1 lists the seven different modes of the serial port. Only one of them can be selected and utilized at any time (the serial port modes are not concurrent). MODE # MODE NAME INTENDED P