Product Information
Crest Audio’s Ethernet NexSys Gateway is the easy way to incor-
porate computer control into your existing Ethernet network.
The figure below shows a typical NexSys network using 2 Gate-
ways for controlling more than 32 amplifiers. The ethernet inter-
face speed is 10Mbit and uses standard CAT5 cable. Systems can
contain up to 240 Gateways.
The maximum number of amplifiers connected to one NexSys bus
is limited by the NexSys Network’s adherence to the “ANSI TIA/
EIA-485“ recommended standard. A NexSys bus, which consists
of multiple amps connected by a length of twisted-pair cable with
two terminating resistors, is limited by RS-485 to a maximum of 32
amplifiers. The recommended twisted-pair cable for this bus is
Belden 8442. The maximum length of this bus is 4000 feet.
The gateway can take advantage of existing network cabling with
no need to install seperate cabling just for amplifier control. A real
cost savings in large installations.
Programmable Control I/O
Eight programmable control ports are available on the gateway. They
can serve as either inputs or outputs. When configured as an input,
the gateway can sense a switch closure, a variable DC voltage, or a
3-contact potentiometer. When configured as an output, the gate-
way can drive a TTL level signal. NexSys contains a utility called
Event Scheduler that allows the NexSys software to react to and
generate control for exernal devices. This utility is very compre-
hensive, easy to use, and extremely powerful..
Crest Audio Ethernet NexSys Gateways are manufactured in the
United States, using only the highest quality selected components
Features
• One RJ45 connector for 10Mbit Ethernet connectivity of
NexSys network with up to 240 Gateways allowed in a system.
• Electrically isolated RS-485 NexSys bus supporting up to 32
NexSys devices.
• Eight user-programmable control I/O ports.
• Front panel power switch, Ethernet link, NexSys data and power
status indicators.
• Rear panel indicators for NexSys data and Ethernet link status
• IEC power receptacle
• 1 rack unit high; width and depth are the same as Crest Audio’s
CK family of Power Processing amplifiers
• Easy to configure using NexSys software
• Five year warranty
NDP-ENG ETHERNET NEXSYS GATEWAY
Up to 240
NDP-ENG’s
Up to 32
NexSys Devices
NexSys RS485
network 1
Amplifier
Amplifier
Amplifier
NDP-ENG
Ethernet
network
NDP-ENG
Amplifier
Amplifier
NexSys RS485
network 2
Up to 32
NexSys Devices
Ethernet
device
Ethernet
device
