Redundancy using DPU without NXAMP
A specific firmware has been developed for the DPU to be use with any amplifiers that possess a GPIO port. Uploading
this new firmware into the DPU through the internal JTAG plug will convert the DPU’s RS232 serial port to a GPIO port.
To load the firmware use a SILICON
LABORATORIES
ADAPTATEUR USB DEBUG for C8051FXX: DEBUGADPTR1-USB.
This new GPIO port can be drive by any amplifier that provides a 5volts GPIO signal. The DPU will switch the power when
the voltage on pin 2 is 0V.
Do not forget to connect the ground (Pin5), between the DPU and the backup
amplifier.
Pin Name
In/Out
Pin 2 is set high (5volts)
Pin 2 from 1 (5Volts) to 0
Pin 2 (RXD)
In
‘INPUT C’ and ‘INPUT A’ back DPU’s
connectors are respectively connected to
SP4-1 and SP4-2 connectors
‘INPUT C’ and ‘INPUT A’ back DPU’s
connectors are respectively connected to
SP4-3 and SP4-4 connectors
NOTE:
When using the DPU with the GPIO firmware the ratio of normal amplifier and backup amplifier is 1:1.
WARNING:
Over voltage on pin 2 may damage your DPU, please be sure that your GPIO output does not exceed 20V
Internal connections in DPU
(schematized by double arrow)
Normal operation Mode
Pin 2
= 5V
Backup operation Mode
Pin 2
= 0V
Connection between SP4-1 and INPUTC connectors. (Same
between SP4-2 and INPUTA connectors.)
SP4-1 (1+) connected to INPUTC (1+)
SP4-1 (1-) connected to INPUTC (1-)
SP4-1 (2+) connected to INPUTC (2+)
SP4-1 (2-) connected to INPUTC (2-)
Connection between SP4-3 and INPUTC connectors. (Same
between SP4-4 and INPUTA connectors).
SP4-3 (1+) connected to INPUTC (1+)
SP4-3 (1-) connected to INPUTC (1-)
SP4-3 (2+) connected to INPUTC (2+)
SP4-3 (2-) connected to INPUTC (2-)
WARNING:
Do not exceed 10KW on DPU’s power connectors.
Both normal and backup amplifiers have to be fed with same audio signals (four different audio signals maximum) and
run same speakers presets.
DPU GPIO MODE (RS232 connector pin description)
5.5V supply 30mA MAX
Pin 3 (TXD)
GPIO In (0V-5V)
Pin 2 (RXD)
Signal ground
Pin 5 (GND)
Unused
Others
