Philips SM30 Connection of Microphones, Adjustments Gain Control Potentiometers, Cim, Operation

Connection of Microphones

The design of SM30 allows a single cable to be used to connect a Microphone to one of the sockets of the Microphone Input Module.

This cable has two screened wires, plus two unscreened wires.

The screened wires carry the audio signal and phantom powering, and the unscreened wires are connected to the remote switch of the microphone. Terminate the cable at side of the microphone with a lockable 5-pole 180° DIN female socket, and at the side of the Input Module with a lockable 5-pole 180° DIN male socket.

The DIN connections, viewed from the solder side of the cable plugs, are illustrated in fig.8.

8.3Adjustments

Gain Control Potentiometers

The 2 front panel controls are input gain controls, used for “lining up” the volume level of the microphone with the rest of the SM30 signal sources (Call Stations, attention signals, pre-recorded messages, background music players, etc.). Because the strength of each person’s voice differs, set each gain control “by ear” so that a clear, comfortable listening level is attained, which is in balance with the other amplified signals.

9	CONTROL INPUT MODULE
	(CIM)	LBB 1284

Each Control Input Module allows eight remote switches to be connected to the Control Centre. Up to 3 Control Input Modules can be located in the SM30 Control Centre allowing a total of 24 remote switches to be used, but resulting in less of Call Station Input Modules and Microphone Input Modules. When a remote switch closes the normally open circuit, the Control Input circuit senses this, and the SM30 microprocessor carries out a series of actions.

9.1Operation

All Control Inputs

Each Control Input can be programmed to carry out SM30 switching functions, including:

■Activation of one of the SM30 attention or alarm signals.

■Activation of a pre-recorded message.

■Routing of the above listed signals to loudspeaker zones, after giving the call a programmed priority status.

Inputs 1 to 8 of first CIM (fig.5.1F).

Apart from the above listed functions, inputs 1-4 may be given an alternative function. This allows remote control of the Music Function Keys, located on the front panel of the SM30 Control Centre:

Input 1 Music volume up activation Input 2 Music volume down activation Input 3 Music mute on/off

Input 4 Music source selection

Input 5-8 Apart from the normal switching functions, inputs 5-8 may be programmed to activate Control Relays, which can be used to start

24