Tap Cable Construction - Bose 3-2-1GS Series II Service Manual

TAP Cable Construction

ETAP Cable Construction and Setup
You will need to make up an ETAP cable using the dia-
gram below. You can build this cable from a Boselink A or
B cable and a DB9 connector. You don't need the RCA
connectors if you don't want them. They are the Zone 1
and Zone 2 audio inputs for the console. You will also
need to use the same level shifter you use for the 321
Series I for TAP. This level shifter made by B+B Electron-
ics, model number 232LPTTL, and can be purchased on-
line at http://www.bb-elec.com. Refer to the photo at right
for an image of the converter.
Boselink Plug
shield
8 7 6
5 9 4 3
2 1
Boselink ETAP Cable Wiring Diagram
Terminal Parameters
Using an IBM compatible PC with Microsoft Windows, Open a hyperterminal window. Set up the
session to communicate with the console using 19200 baud, 8 data bits, no parity, one stop bit.
Setting up console for ETAP mode
Immediately after system bootup (within 5 seconds) an ETAP command must be issued to put
the console into ETAP mode. Any ETAP command can be used to set this. Note: The system
must have power removed, and then re-applied in order for it to boot. Pressing the ON-OFF
button on the console does not completely remove power. The Boselink input and ETAP port
share the same hardware UART on the CS98200 and it must know which format to speak via
the Boselink connector. If no ETAP command is issued in this time, then the console assumes
that the unit is operating in a "customer environment" and switches to Smart Speaker.
DB-9S
5 4 3 2 1
9 8 7 6
RCA Jack,
Zone 2
4 places
WH
shield
RD
WH
Zone 1
shield
RD
ETAP Connection and Handling
ETAP Overview
A serial RS-232 interface is provided on the
console for communicating with the test system.
This interface, called ETAP (Extended Test
Access Port), and it uses strings of standard
ASCII characters as commands. The ETAP is
accessed via the expansion port (BoseLink)
interface. Some of the commands will be
brokered by the Main Board through to the Tuner
Board for implementation, and the subsequent
replies will be generated by the Tuner Board and
passed via the Main Board out to the test system
69
B+B Electronics model
232LPTTL RS232 to TTL
converter