PAGE 16 / 80 NXAMPMK2 USER MANUAL
F: RS-232 PORT
This serial port is used to connect a NEXO DPU (Digital Patching Unit) device. Note that it is not possible to
upgrade the NXAMPmk2 firmware though this serial port.
Thus, this is an input. The TxD pin is
Thus, this is an output. GND is the ground.
A crossover cable (connecting RxD pin of NXAMP to TxD pin of the DPU, and so on) is needed to use this
serial port with the NEXO DPU device. Please see DPU user manual for further details.
G: GPIO PORT
This GPIO port is used for interfacing the amplifier to security system, or to allow a basic remote control of
the device. NEXO DMU (Digital Meters Unit) device also connects here.
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.
WARNING!
It is mandatory to have a galvanic isolation between these signals and any another equipment. Thus,
either the target equipment should present isolated GPIO system, or the signal should go through small
signal relays to guarantee that the NXAMP GPIO will be isolated from the other equipment.
The maximum current available on the GPIO port is the following:
- Maximum 200 mA drawn from the totality of the +5 V outputs.
- Maximum 200 mA drawn from the totality of the GP Outputs, with a maximum of 32 mA for each output.
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