AMX NetLinx NXM Series - Manual (Page 23)

NXC-I/O10 Input/Output Control Card
17 NetLinx Cardframe, Control Cards, and NetModules
Setting the Switch/Voltage Mode Jumpers
The NXC-I/O10 responds to switch closures or voltage-level (high/low) changes. Compatible I/O devices
include the Power Control Sensor (PCS), tape transports and limit switches. The inputs are set for SW mode
(closure) or VO mode as described below.
Setting the Voltage Clamp Jumper (+12V or Open)
Set the V- Clamp jumper (J31) to +12 V (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 +12 V and OPEN settings are only
enabled when the I/O ports are set to SW mode. The V-Clamp jumper settings are described below.
When this jumper is 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 if the voltage exceeds 12 V. Contact the
relay manufacturer to determine the size of the diode in the source relay.
SW (switch) Mode
setting (default)
(Jumper pins 2 and 3) Senses switch or relay contact closures or provides a logic-level output.
The 3-pin jumpers for each input should be set to SW before wiring inputs
to the Card. An "On" condition is triggered by contact closures or a logic
low of 0 to 1.5 VDC. An "Off" condition is triggered by a logic high of 2.5 to
5 VDC; set the associated I/O to switch mode. When used for an output,
each I/O port acts as a switch to ground (GND), and is rated at 200 mA @
12 VDC.
VO (voltage) Mode
setting
(Jumper pins 1 and 2) Senses high- and low-voltage states commonly from AC or DC signals.
This mode provides opto-isolation. The 3-pin jumpers for each input
should be set to VO (voltage mode) before wiring inputs to the Card. An
"On" condition is triggered by DC levels from 2.5 to 28 VDC (+ or -), or AC
levels from 2.5 to 24 VAC. An "Off" condition is triggered by DC levels
from 0 to 1.5 VDC (+ or -) or AC levels from 0 to 1.5 VAC.
In switch mode, the A terminals are connected to the NetLinx Controller's ground.
Sources that require isolation from the Controller's ground should use voltage mode,
and provide switched DC power for sensing as required.
+12 V mode setting (default) Use the default setting for all loads that require less than 12 V.
Open mode setting When this jumper is set to Open, and an I/O port is used as an
output, the I/O port is rated at 85 mA @ 28 VDC.