Pinouts, signals, and i/o mode functions, Setting the voltage clamp jumper (+12v or open), 12v mode (default) and open mode settings – AMX Input/Output Control Card NXC-I/O10 User Manual
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12/07
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Pinouts, Signals, and I/O Mode Functions:
Setting the Voltage Clamp Jumper (+12V or Open):
Set the V-Clamp jumper (J31) to +12V (default) to clamp any voltage
connected to I/O ports 1-10 to 12 V. Set to OPEN for connections that will
draw more than 12 V. Remember, the +12V and OPEN settings are only
enabled when the I/O ports are set to SW mode.
+12V Mode (default) and Open Mode settings
Use the default setting for all loads that require less than 12V.
When this jumper is set to Open, and an I/O port is used as an output; the
I/O port is rated at 85mA @ 28VDC.
Important! When this jumper is set to Open, it is the technician's
responsibility to clamp the external source relay anytime the voltage
exceeds 12 V.
The source relay should always be clamped, even if the voltage exceeds
12 V.
Contact the relay manufacturer to determine the size of the clamp diode to
place on the source relay.
NXC-I/O10 Pinouts, Signals, and I/O Mode Functions
Pin
Signal
SW mode Functions
VO mode functions
1
Common
Signal ground
Common #1
2
I/O #1
Input #1
Input #1
3
Common
Signal ground
Common #2
4
I/O #2
Input #2
Input #2
5
Common
Signal ground
Common #3
6
I/O #3
Input #3
Input #3
7
Common
Signal ground
Common #4
8
I/O #4
Input #4
Input #4
9
Common
Signal ground
Common #5
10
I/O #5
Input #5
Input #5
11
Common
Signal ground
Common #6
12
I/O #6
Input #6
Input #6
13
Common
Signal ground
Common #7
14
I/O #7
Input #7
Input #7
15
Common
Signal ground
Common #8
16
I/O #8
Input #8
Input #8
17
Common
Signal ground
Common #9
18
I/O #9
Input #9
Input #9
19
Common
Signal ground
Common #10
20
I/O #10
Input #10
Input #10
FIG. 4 V- Clamp jumper (J31) settings
+12V mode setting (default)
Open mode setting