User manual

KB-211/KB-211GM Two-Channel Speaker Stations Clear-Com Intercom Systems

Rev. A

1—Single Channel

In some installations, the KB-211 is intended to be used only with one

intercom channel. Setting the Single Channel switch to the ON position will

connect the KB-211 to the one intercom channel regardless of the position of

the front-panel Channel selector.

Note:

In two-channel installations, this switch must be set to the OFF position.

2—Long Line

If a long cable run is unavoidable and approaches 700 ft. or more, set the

Long Line option switch to the ON position. The ability to set an effective

sidetone depends upon properly setting this switch.

3—Latch Diable

Setting the Latch Disable switch to the ON position will disable the latching

function of the Talk button. In this mode, the Talk button must be held in

continuously while the operator is talking.

15—Call Signal Jumper

In some installations it is important to receive a call signal from either channel,

regardless of the setting of the Channel selector. The plug-on jumper P1

makes the Call lamp respond to either the selected channel or to both

channels, depending upon its orientation. By default, the jumper is set to the

selected channel position. When the TW or 4-Wire Option modules are

installed, this jumper is not used. In TW operation, the call signal always

originates on channel A. In 4-Wire operation, the call signal is not used.

16—Intercom Line Connection

The KB-211 contains a five-terminal, plug-on connector for intercom line

connection. This connector is intended to be unplugged from the circuit board

when connecting the intercom line, and then plugged back on when the wiring

is completed. The connections for each pin are visible on the circuit board

when the connector is unplugged. The pinout of this connector is as follows:

• Pin 1—(NC)

• Pin 2—Channel A Audio

• Pin 3—Channel B Audio

• Pin 4—Power (+30 VDC)

• Pin 5—Ground (Shield).