Gilderfluke&Co 8 Bit Digital Audio Systems - Manual (Page 34)

tween each character sent. Without this delay, you might over run the
Digital Audio RepeatersÕ incoming data buffer.
If you have hooked up the Digital Audio Repeaters to your computer and
it still doesnÕt seem to respond to the keyboard, the first thing to check is that
you are attached to the right serial port. The easiest way to do this is to dis-
connect the Digital Audio Repeaters and short between the Tx data out and
Rx data in pins on the serial port connector on the back of your computer.
On all IBMs and compatibles this means sticking a paper clip or similar tool
between pins 2 and 3 on the ÔCom.Õ connector. While still running the
modem program, anything you type should be shown on the screen while
this paper clip is in place, while nothing will appear when you remove it. If
your computer passes this test, then you are using the right serial port and
the problem is most likely the baud rate setting or in your wiring to the
Digital Audio Repeaters. If you get characters on the screen even with the
paper clip removed from the serial port, it means you probably need to set
the ÔechoÕ mode to ÔnoneÕ or Ôfull duplexÕ and try this test again.
The digital audio system expects to see the serial data in the following
format:
ONE START BIT
EIGHT DATA BITS
ONE STOP BIT
If the odd parity is enabled, then the data appears in the following for-
mat:
ONE START BIT
SEVEN DATA BITS
ODD PARITY BIT
ONE STOP BIT
When the parity is enabled, any data with a parity error in it is simply ig-
nored.
There are a number of methods that you can use to access a number of
cards in the digital audio system at the same time. If you are controlling the
audio through the serial input, you can use any or all of them as best suits
your application. The Types of Commands Available are:
1) All - Any command of this type affects all of the cards in the system.
EXAMPLE: A 'Start All' command will Start All of the Digital Audio
Repeaters in the system.
2) Track Specific - Only the one card addressed by the command is
affected by this type of command. Each card in the system must be
configured to respond to a different TRACK NUMBER address in order
for the system to operate properly.
EXAMPLE: A 'Start Track#' command will start only the one card ad-
dressed by the TRACK# in the command.
3) Group - There are 16 possible groups in the digital audio system.
They are numbered from 0 through F. You can configure any card in
the system to respond to anywhere between 1 and 12 of the differ-
ent groups (see the configuration sections of this manual for instruc-
tions on how to do this). Commands of this type affect all cards that
have the matching GROUP NUMBER. This type of command can be
used when you wish to access a number of cards at the same time.
EXAMPLE: A 'Start Group#' command will Start All cards which have
been configured to respond to the GROUP# in the command.
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