User manual CREST AUDIO NDP-JTH NEXSYS HUB SPECIFICATIONS

[. . . ] NDP-JTH NEXSYS HUB Product Information Crest Audio's NexSys Hub in an integral part of any NexSys computer-controlled network that needs to support more than 32 amplifiers or nodes. 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 (or "RS-485"). A NexSys bus, which consists of multiple amps connected by a length of twisted-pair cable with two termination-resistors, is limited by RS485 to a maximum of 32 amplifiers. [. . . ] When configured as an input, the Hub can sense a switch closure, a variable DC voltage, or a 3-contact potentiometer. Inputs may then be interfaced to NexSys and/or the Event Scheduler in order to automate NexSys functions from external controls. When configured as an output, the Hub can drive a TTL signal. NexSys and/or the Event Scheduler may then be interfaced to external devices or indicators. Crest Audio NexSys Hubs are manufactured exclusively in our USA facility, using only the highest quality selected internal components. Primary Network (RS-485) Network may contain up to a total of 32 devices Features · Extends NexSys control to up to 1024 devices · Two electrically-isolated, balanced NexSys busses · NexSys busses and 8 user-programmable control I/O ports use Phoenix COMBICON® connections; TTL and relay-driving outputs available · Front panel status indication and power switch · Rear panel data present indicators · IEC power receptacle · 1 rack unit high; width & depth same as Crest Audio's CK family of Power Processing amplifiers · Five year warranty BUS SERVER AMPLIFIER AMPLIFIER AMPLIFIER NDP-JTH HUB Secondary Network 1 (RS-485) AMPLIFIER AMPLIFIER AMPLIFIER NDP-JTH HUB Secondary Network 2 (RS-485) AMPLIFIER AMPLIFIER AMPLIFIER Network may contain up to a total of 32 devices Network may contain up to a total of 32 devices NDP-JTH NEXSYS HUB S P E C I F I C AT I O N S Electrical Specifications AC Line Current NexSys Interface Maximum: Typical: 165 mA. , @ 120V 65 mA. , @ 120V Architect's & Engineer's Specifications The network Hub shall contain two electrically isolated Crest Audio NexSys busses. One bus shall be dedicated to the primary network (which includes the network's bus server). The other bus shall be dedicated to the secondary network and provide access to as many as 32 additional NexSys network nodes. Any node on the secondary network shall be accessible to the bus server through the network hub. Each NexSys bus shall conform with RS485 electrical serial protocol. The network hub shall poll the status of each node on the secondary network independently from the bus server. The hub shall also send commands to nodes on the secondary network as dictated by the bus server on the primary network. The network hub shall contain eight programmable control ports to accommodate external inputs to NexSys via switch closure, variable DC voltage, or 3-contact potentiometers. The control ports shall also have TTL outputs and relay-driving outputs available to control external devices from NexSys. The front panel shall include an on/off power switch and an LED to indicate power status. The rear panel shall be fitted with the two sets of dual rotary switches with the purpose of assigning NexSys data bus addresses to the hub. It shall also be fitted with data present indicators, and the following 5mm, 3-pin Phoenix COMBICON® connectors: two for NexSys primary network access, two for NexSys secondary network access, and eight for programmable I/O control ports. [. . . ] Crest Audio specification literature is available in downloadable PDF format; visit our website at: http://www. crestaudio. com. ©1997 Crest Audio Inc. Crest Audio Inc. 100 Eisenhower Dr. , Paramus NJ 07652 USA TEL: 201. 909. 8700 FAX: 201. 909. 8744 http://www. crestaudio. com [. . . ]