User Interface Block; Communication Block - Yamaha Nexo NXAMP4X4 User Manual

You can see with the gray line on the above drawing that unused pins on output
speakon are shorted together, but are not connected to ground. Therefore be careful as
very high voltage might be present on these unused pins.

User interface block

The user interface block has already been described through the front panel description in
the first part of this document. Please note that all the commands and displays are
available through the ESmonitor software by Auvitran, through the Ethersound™ network
(except the mains switch).

Communication block

The communication block regroups the RS232 port (on a sub-D9 plug) and the GPIO port
(on a sub-D25 plug).
The RS232 port is mainly used to upgrade the firmware of the unit from a PC computer.
But it could also be used in the future for local communication with other equipments. The
pin-out is given bellow:
The RxD pin is the "Receive data" pin from the NXAMP point of view. Thus this is an input.
The TxD pin is the "Transmit data" pin from the NXAMP point of view. Thus this is an
output. GND is the ground.
A crossover cable (connecting RxD pin of NXAMP to TxD pin of computer, and so on) is
needed to use this serial port. Please see further the dedicated part of this document on
that subject.
The GPIO port is a Global Purpose Input/Output signals system that can be use for a wide
range of application, mainly interfacing the NXAMP with security systems. There are the
following signals available:
• 8 x General purpose output signals from NXAMP (5 Volts signals)
• 5 x General purpose input signals to NXAMP (5 Volts signals)
• 4 x 5 Volts outputs
• 8 x GND (ground) signals.
The pin out of these signals is given bellow:
GENERAL DESCRIPTION
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