StudioTech M45-00151 manual Two Units can be a TW-12B Replacement

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Figure 8. Detail of front panel showing the status LEDs that display the software version. In this example, the software version is 1.3.

Note that while it’s easy to determine which software version is loaded into the Model 45 a trip back to the factory is required to update it. The 8-bit micro- controller that provides the unit’s logic “horsepower” also includes internal FLASH memory. This nonvolatile memory is used to store the operating software (“firmware”). Re-programming this mem- ory requires using a specialized program- ming unit. While not outrageous in price, it still costs in the range of US$500. The pro- grammer uses a ribbon cable and socket to interface with a 6-pin “header” on the Model 45’s printed circuit board. And, as you would guess, once connected repro- gramming takes only a matter of seconds. But unfortunately the programmer is not something that would be found in a typical “field shop” or repair facility.

Two Units can be a TW-12B Replacement

Two Model 45 units with their 4-wire in- terface connectors linked in a crossover fashion can act as a universal 2-wire-to- 2-wire “bridge.” This should, in theory, create an updated and improved version of the venerable Clear-Com TW-12B unit. In this arrangement two independent

2-wire party-line intercom systems can function as one while still maintaining full electrical isolation.

The connection scheme is very simple, using just four male-female 3-pin XLR patch cords. The 4-wire outputs of the first Model 45 would be connected to the 4-wire inputs on the second Model 45; the 4-wire outputs on the second Model 45 would connect to the 4-wire inputs on the first Model 45. A 2-wire party-line intercom circuit would connect to each Model 45

Model 45 User Guide

Issue Preliminary 2, March 2009

Studio Technologies, Inc.

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Contents User Guide This page intentionally left blank Table of Contents Issue Preliminary 2, March Model 45 User Guide Model 45 Front Panel IntroductionAnalog Hybrids with Auto Nulling Wire Party-Line InterfaceWire Interfaces Special Applications Pro Audio QualityDesign Philosophy Simple InstallationShipping Carton Contents InstallationLocating the Model Rack Mounting the Model Protecting the EnclosureWire Line Inputs Wire Audio Inputs and OutputsWire Line Outputs Wire Party-Line Intercom ConnectionsAdapter cable wiring diagram Model 45 Power SourceExternal 24 Volts as the Power Source Initial Operation ConfigurationAuto Null Button Operation Model 45 Provides 2-Wire Party-Line Power SourceAuto Terminate Disable External 24 Volt DC Power Source Wire Mute during Auto NullOperation Issue Preliminary 2, March Model 45 User Guide Level Meters Wire Circuit Serves as the Unit’s Power SourceDetail of front panel showing auto null section Auto NullAuto Terminate Disable Software Version Display Technical NotesTwo Units can be a TW-12B Replacement Issue Preliminary 2, March Model 45 User Guide General Audio SpecificationsAppendix a Appendix B Appendix C This page intentionally left blank