StudioTech M46-00180 manual Configuration Interface 1, Wire Party-Line Power Source

Connection	Wire Color
Neutral (N)	Light Blue
Line (L)	Brown
Earth/Ground (E)	Green/Yellow

Safety Warning: The Model 46 does not contain an AC mains disconnect switch. As such, the AC mains cord plug serves as the disconnection de- vice. Safety considerations require that the plug and associated inlet be easily accessible to allow rapid disconnec- tion of AC mains power should it prove necessary.

As soon as AC mains power is applied the Model 46 will begin its power-up sequence. As a “boot up” indication the power LED and each of the status LEDs will momentarily light. After the sequence has completed the power LED will again light and remain lit. The unit is now fully functional.

Configuration

For the Model 46 to support the needs of specific applications a number of operat- ing parameters must be configured. These include the 2-wire party-line power source, the nominal 2-wire level, and the nominal 4-wire level. Three 4-position DIP-type switch assemblies are used to establish the desired configuration. One DIP switch assembly is associated with interface 1, a second is associated with interface 2, and a third associated with advanced operat- ing features that apply to both interfaces.

Configuration – Interface 1 and 2

The DIP switch assemblies associated with interface 1 and 2 are accessible on the Model 46’s front panel. They provide identi- cal capability for their respective interfaces. Refer to Figure 6 for a detailed view. In this section the four switches associated with interface 1 will be covered in detail. This information applies to interface 2 as well. The four switches allow selection of the

2-wire party-line power source, the nominal level for the 2-wire party-line channels, and the nominal level of the 4-wire inputs and outputs.

Figure 6. Detail of front panel showing four DIP switches

2-Wire Party-Line Power Source

DIP switch 1 is used to select whether or not the Model 46 provides DC power to pin 2 of connectors associated with the

2-wire party-line intercom channels. Two

3-pin male XLR-type connectors, one located on the Model 46’s front panel and one on the back panel, are used to interconnect the Model 46 with the inter- com user devices. When switch 1 is in its off (down) position the Model 46 will not provide DC power. This switch setting is appropriate when an external intercom

Issue 2, September 2007	Model 46 User Guide
Page 16	Studio Technologies, Inc.