User manual

DPU DIGITAL PATCHING UNIT FOR NXAMP
(3) RS232 port
Connect this serial port to NXAMP RS232 port using a shielded crossover (null-modem)
cable only (2 meters / 16 feet max) with female db9 connectors on each side. Bellow is the
cable to be used to connect NXAMP to DPU pinout.
NXAMP serial port pins DPU serial port pins
2 (RXD)  NXAMP Receive 3 (TXD)
3 (TXD) NXAMP Transmit  2 (RXD)
5 (GND) Signal ground 5 (GND)
Other Unused Other
NB: A cable kit for DPU containing
• 2 x 4 poles 4 x 4mm² speakON® cable
• 1 x db9 crossover (null-modem) cable
• 2 x IEC mains cable with lockable connector (available with EU or US plugs)
can be purchased from NEXO separately.
Operating the DPU
Using the DPU is straightforward, as there is nothing to set up. The only requirement is
that the NXAMP firmware supports the DPU, otherwise it will stay in Stand-by mode with
nothing patched on its front panel connectors.
WARNING: NXAMP firmware should be at least LOAD3_11 for the DPU to work. If
not, the DPU will stay in stand-by with nothing routed on its outputs
Connections and start up
Be sure that the host NXAMP and the DPU are both disconnected from mains.
Connect the two four poles speakON® cables between NXAMP (Speakon A and C) and
DPU (Input A and C), and connect the RS232 port between the NXAMP and the DPU
using a crossover cable (see serial port cabling above).
Then connect at least one IEC cable to one of the IEC mains inlet of the DPU. The left most
display should lit and the message “Stand-by’” should appear on the screen.
Connect the NXAMP mains plug(s) and turn the NXAMP “ON”. Check the LOAD revision
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