Crown AMB-5, SMX-6, MPX-6 Options, A 1-Loop IQ Interface, Wiring the Crown Local Net

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IQ Mixer / Multiplexer Hardware Installation

4 Options

There are two optional uses for mixer serial ports. The first is direct RS232/RS422 communication with the unit where the unit is its own interface and interface for any connected components. The sec- ond, called Crown Local Net, applies only to SMX-6 mixers.

4.1 A 1-Loop IQ Interface

The serial port allows any of the mixer models to serve a an IQ interface between a host computer and a single Crown Bus loop.

Note: While 250 IQ components of each type can be controlled on a single Crown Bus loop, it is recom- mended that no more than 20 units be connected to an AMB-5 or SMX-6. This is because of the tremen- dous timing demands on their microprocessors. More than 20 IQ components may cause timing problems. The MPX-6 has no such limitations.

Note: While the mixers may be used as a system interface, they do not support IQ2 protocol as an interface. The only components that an IQ mixer may used as interface for are other mixers, MRX relay modules, and IQ-PIP-AP modules.

With the built in serial port an IQ mixer can eliminate the need for an external IQ Interface (IQ-INT II) in a small system. The mixer connects directly to the host computer via the DB25 serial connector. Switches accessed through the side of the chassis are used to select the serial interface configuration, parity and baud rate. See Section 3.1 for specific wiring and switch instructions.

4.2 Crown Local Net

Crown Local Net is available only for an SMX-6. It enables multiple SMX-6sto be interconnected via a Crown Local Net (CLN). This is a pseudo-RS422 communication loop designed for local communica- tion between IQ components apart from the Crown Bus. SMX-6scan use this option to communicate the total number of open mics in the system as well as their individual ducking priorities. In this way, one SMX-6will know how many mics are being used by other SMX-6sand can take appropriate action to prevent feedback or implement priority switching (ducking) of mics.

Note: Because RS232/422 and CLN use the same DB25 connector, they cannot be used at the same

time. This means that SMX-6s will need to be con- nected to a Crown Bus via an external IQ interface for setup of a CLN.

4.2.1 Wiring the Crown Local Net

A Crown Local Net is a serial loop (Figure 4.1). With two exceptions, a Crown Local Net loop is wired the same as standard RS422 wiring. Exception 1: The Crown Local Net does not use handshaking, there- fore pins 4 and 5 (RTS/CTS) are not used. Exception

2:When more than 2 components will be communi-

CLN Interface (RS422)

CLN Interface (RS422)

CLN Interface (RS422)

Fig. 4.1 A Crown Local Net RS422 Serial Loop

cating on a Crown Local Net, two cables must be connected to each DB25 connector…one for incom- ing data and one for outgoing data. With two units on a Crown Local Net, only one cable is attached to the connector.

Figure 4.2 shows the wiring for a 3-unit Crown Local Net. If more units are desired, simply add another unit and follow the same pattern for wiring. Note: Pin 7 should not be used as a ground if the units are already properly grounded. The wire used for RS422 communication is usually unsuitable for use as a ground.

Important: The Crown Local Net must make a com- plete loop. If the last unit in a group is not connected to the first unit, the system will not function.

Important: The Crown Local Net depends on proper IQ address assignments, even if the system will not be installed with a Crown Bus loop. Each unit in a Crown Local Net must have a different IQ address. See Section 3.2 for details.

As more diverse IQ communications are needed, the Crown Local Net will be available to move infor- mation directly between IQ components without af- fecting the performance of a host computer.

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Contents IQ Mixer/Multiplexer Full THREE-YEAR Warranty Page Contents Illustrations Three Mixer / Multiplexer Models Unpacking WelcomeOptions Facilities Crown Bus Input/Output Connector Main Audio OutputsAuxiliary Bus Audio Outputs Audio InputsHardware Installation Connecting to a Host Computer StepRS232 Cable Wiring for a PC Connecting to the Crown Bus Step Setting the IQ AddressCrown Bus Wiring Multiloop AdvantagesIQ Interface Connecting the Audio Ins & Outs Step 1 Mic/Line InputsCable ShieldedLead TwinSingle-conductor coax Or twisted pair Load Audio OutputsTwin-lead shielded cable Stack Inputs Paralleling InputsConnecting Auxiliary Devices Step 22 a 12x8 Mixer Using 8 Mixer/MultiplexersWiring the Crown Local Net OptionsA 1-Loop IQ Interface Crown Local NetCrown Local Net Wiring Rev Crown Service ServiceInternational Service Control and Interface Section Technical InformationAudio Auxiliary Port 3 D/A ConverterLog Amp and A/D Converter Main Output Specifications GeneralIQ Address Switch Appendix aFig. A.2 IQ Address Switch Settings from 126 to

AMB-5, MPX-6, SMX-6 specifications

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