Nexo Digital Patching Unit, Quick Start Manual

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GPIO NXAMP pins description and cabling in a redundant system
Find the NXAMP GPIO port pins description below. Special cabling of the GPIOs port is needed to run redundant GPIO
mode 6 & 7 properly.
The maxim ratio when using the redundant GPIO mode 6 and 7 is 1:5, means one backup amplifier for 5 normal
amplifiers. The GPIO cabling for this configuration is described below. The five vertical connectors schematized normal
amplifiers GPIO connectors and the horizontal one the backup NXAMP GPIO connector. If you use less than a 1:5
ratio, follow the same cabling pattern for your specific installation and just remove connectors you don’t used from
the following schematic.
1
20
2
21
3
22
4
23
5
24
6
25
7
8
9
10
11
12
13
14
15
16
17
18
19
27
26
D C
on
nec<=
>r 2
5
1 20 2 21 3 22 4 23 5 24 6 25 7 8 9 10 11 12 13 14 15 16 17 18 19
27 26
J6
D Connec<=>r 25
1
20
2
21
3
22
4
23
5
24
6
25
7
8
9
10
11
12
13
14
15
16
17
18
19
27
26
D C
on
nec<=
>r 2
5
1
20
2
21
3
22
4
23
5
24
6
25
7
8
9
10
11
12
13
14
15
16
17
18
19
27
26
D C
on
nec<=
>r 2
5
1
20
2
21
3
22
4
23
5
24
6
25
7
8
9
10
11
12
13
14
15
16
17
18
19
27
26
D C
on
nec<=
>r 2
5
1
20
2
21
3
22
4
23
5
24
6
25
7
8
9
10
11
12
13
14
15
16
17
18
19
27
26
D C
on
nec<=
>r 2
5
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND GND GND GND GND GND GND GND
NORMAL NXAMP N°1
NORMAL NXAMP N°2
NORMAL NXAMP N°3 NORMAL NXAMP N°4 NORMAL NXAMP N°5
BACKUP NXAMP
GPOutput1 <=> GPInput5
GPOutput1 <=> GPInput1
GPOutput1 <=> GPInput2
GPOutput1 <=> GPInput3
GPOutput1 <=> GPInput4
All GPInput1 <=> GPOutput1
WARNING: When cabling GPIO ports between many amplifiers do not forget to parallel all NXAMP’s GND pins . GND pins are
labeled with a “GND net” that means they are all connected together. Connect a minimum of five GND pins when using a ratio of 1:5.