User manual XTA 4

[. . . ] 1. 10 Page 2 4 Series Operator's Manual 4 Series Quick Reference Editing channels : press channel's GAIN key. To scroll through channel's parameters, use the BACK and NEXT keys. Use the BACK and NEXT keys to select the sub-menu required, and enter the sub-menu using the ENTER key. The Menus and their Contents GLOBAL MEMORY Sub-menu: Recall/Store/Erase input, graphic and crossover settings, or combinations of. [. . . ] Shadow ID numbers are accessible when the unit's interface is configured, and will appear after ID number 128, starting from 1 again, but designated shadow IDs with an `s' after the number ­ 1s. Any ID can have multiple corresponding 1s shadows. RS485 Interface This interface is fitted as standard to all units and is accessed via the 3-pin XLR sockets on the rear of the unit. Cables to connect units together or to an RS232-485 converter will need to be wired one-to-one. We recommend the use of standard shielded microphone cables, or a balanced feed from a multicore. RS485 is a fully balanced system, capable of sending data over distances of up to one kilometre. The RS485 output of each unit is purely hardwired from the input and so no electrical regeneration of the signal is provided. What this means is that the distance from the first RS485 output to the last RS485 input must not exceed 1km in total. As this diagram illustrates ­ The combined length of cables 01 + 02 + . . . NN < 1000 metres. XTA has a range of tried and tested interfaces, all of which are listed in the XTA Interface Guide, available from our website. We can supply all the interfaces described in this guide directly ­ please get in touch. Page 28 4 Series Operator's Manual RS485 Connection To use RS485 communication directly from a computer, a master unit must be configured to receive RS485. You must have a suitable RS485 port on your computer, or a converter connected to the serial port in use. This configuration is shown below, along with the required unit setup. Both the converter and the required adapter cables are available from XTA. The adapter is available in a kit, which includes an RJ-45 adapter, the XLR to 9-pin adapter, and the converter itself. If you need to make up one of the XLR to 9-pin adapters, the pin-out is: XLR 1 2 3 D-type 1 3 8 Operators Manual Page 29 ¥ ¥ ¥ ¥ ¢ ¢ ¢ ¢ ¤ ¤ ¤ ¤ £ £ £ £ ¢ ¢ ¢ ¢ ¡¡ ¡¡ If your laptop or PC does not have a spare serial port (or any serial ports for that matter!), the RS485 converter must be connected through a USB ­ Serial converter. The RS485 converter that XTA recommend is available in two types ­ the standard K2, and the more advanced K2-ADE version. Only K2-ADE version will work with USB-Serial converters, as these converters do not support the extra handshake lines used with the standard converter. Both the converters and the required adapter cables are available from XTA. The adapter is available in a kit, which includes a USB-Serial converter, the XLR to 9-pin adapter, and the K2-ADE converter itself. XTA has a range of tried and tested interfaces, including USB and wireless solutions, all of which are listed in the XTA Interface Guide, available from our website. We can supply all the interfaces described in this guide directly ­ please get in touch. If a DP224/6 receives a MIDI Start or Stop command (used to mute / unmute all outputs) it will relay this message on the RS485 port to any connected units. The 4 Series units will respond to this message even though it cannot directly receive MIDI commands, due to not having a MIDI interface ;) Page 30 4 Series Operator's Manual AES Inputs and Outputs The 4 Series units have a full AES implementation built in as standard. This allows the unit to both receive digital audio directly, and to transmit digital audio on to other devices. [. . . ] This sets the 3dB point of the filter which features a steep roll-off (of approx 36dB/Octave down to one Octave above (or below in the case of a HPF) the turnover frequency. However, the gain does increase again above this frequency to settle at 12dB down from 0dBr. This filter can be used in conjunction with the standard crossover filters to produce sharper roll-offs than would be otherwise achievable. The use of this filter is explained in the following example. The graph shows three different low pass filter shapes. [. . . ]