Gilderfluke&Co old MACs 8 bit Digital Audio System User Manual

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Input Triggering:

"K"

'A' Input Closing Edge:

"L"

'A' Input Opening Edge:

"M"

'B' Input Closing Edge:

"O"

'B' Input Opening Edge:

"P"

'PB' Input Closing Edge:

"Q"

'PB' Input Opening Edge:

"R"

'Aux. Port' Input Closing Edge:

"S"

'Aux. Port' Input Opening Edge:

Each Digital Audio Repeater card has two opto-isolated external inputs, one push button input
on the front panel, and one AUX PORT input. These commands are used to select what
actions will take place on each edge of each of these inputs. Note that both rising and falling
edge actions are available to the user. This allows you to to do things like start a Repeater on a
closing edge and then stop it on the opening edge of the same input.

The closing edge on the 'A', 'B', and 'PB' inputs are considered to be when a normally open
push button or switch is closed. The opening edge is when that same switch or push button is
opened. A closing edge on the AUX PORT is considered to be any of the eight inputs closing if
the direct select option is 'on', or any change in the input (except going to all inputs open) if
the direct select option is off. An opening edge on the AUX PORT is when all eight of the inputs
go to an open condition.

The hardware for the 'A', 'B', and 'AUX PORT' inputs can be configured to run from either an
internal power supply and a simple switch closure, or from a external power supply or powered
output.

When each Digital Audio Repeater card resets or is first powered up, it checks the conditions
on all of the inputs, inverts them, and then compares them with the steady-state conditions of
the inputs. What this means is that on power-up, if an input you are using to tell a card to run
is in the 'run' condition, the system will start immediately.

If multiple inputs to the system arrive simultaneously, they have the following priorities:

'AUX PORT" INPUTS

'A' input

'B' INPUT

'PB' INPUT

This will probably happen only on power-up.

The 'A' input is the only one which is interrupt driven. It should be used for most start and other
inputs which require synchronization between a number of cards.

"x" or "X"

eXit Setup Mode:

This command is used to exit the setup mode. If you hit this command in error, hitting an
ape key will get you back to the setup mode. All of the setup commands which don't
take effect immediately, take effect when the eXit command is entered. This includes things
like the BAUD RATE, so you will have to change the baud rate of the terminal you are using at
this time.
The eXit command asks you if you want to save the current setup permanently. If you answer
'Y', the EEPROM will be written with the current configuration. If you answer 'N', the setup mode
will be exited without writing to the EEPROM.
All cards in the system have their serial ports disabled while any card in the system is in setup
mode. This is the only command to which they will respond. After the initial 'X', all of the other

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