Tesira Operation Manual
10. Rear panel interface
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D SERIES Tesira Operation Manual rev 1.0.0
While in SLEEP state, only wake and status commands are available. The Set Power command is available only in
the ON or STANDBY state. In order to set the power state from the SLEEP state, it is necessary to rst wake the
device by using the Wake command.
While in the ON or STANDBY state, an error will be returned as a text response of ERR<CR> if an unrecognized
command or an invalid power value is received. While in the SLEEP state no error is returned.
Following is a list of power states used by Status and Set Power text commands. The text values are ASCII.
Power State Text Value
SLEEP
0
ON
1
STANDBY
2
10.3.3. GPIO port
The rear panel logic connector has four GPIO pins plus one ground pin. It is used for power control and status
monitoring.
Pin 5
I/O 4
Pin 1
GND
Pin 3
I/O 3
Pin 2
I/O 1
Pin 3
I/O 2
Pin Function Description
1
Ground
2
Input
A transition from logic 0 to logic 1 transitions
the power state to ON. A transition from logic
1 to logic 0 transitions the power state to
SLEEP. This is edge triggered.
3
Input Not used
4
Output
A logic 0 when the amplier is in the ON
state and logic 1 otherwise
(STANDBY and SLEEP).
5
Output
A logic 0 when either the amplier or an
audio channel has at least one fault. A logic
1 when there are no faults. Faults detected
by the Tesira application that runs on the
Tesira host card do not apply to this output.
NOTE: A logic 1 is dened as TTL high level and a logic 0 is dened as TTL low level.
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