06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 20 of 32
The Remote Speaker(s) should be 25 Volt units, tapped at 2.5 Watts or less.
Since the remote speakers are also used as microphones, all remote speakers on the system
that are used for two-way communications should Similar, and be tapped the same.
It is assumed that two-way communications only takes place to one remote speaker at a time.
Speakers that are only used for paging may be tapped to any power level up to 20 Watts. It is
important that in any paging application that the total load not exceed 20 Watts.
The logic interface is ideal for external control with features designed to ease system
integration.
The ICA-202D has two Flip-Flops, one for Activation, and the other for the Call function. These
Flip-Flops are configured so that the external Control Inputs can override the internal states.
If the Shut Off input is tied to Common, Activation follows the Active input, which is ideal for
external use with an external controller
The internal Call Flip-Flop may be used, or bypassed for use by an external controller.
If the internal Call Flip-Flop is bypassed, the Call Switch input should also be set to
non-edge triggered. The Call Switch input is then sustained to cause the Call Tone to Sound.
When the Internal Call Tone Flip-Flop is used several control variations are possible.
The Call input may be configured as Edge Triggered or Level Triggered. For PLC operation this
determines whether the interface will respond to a Call Input that is pending when the Intercom
becomes inactive. In some applications any pending call should be sounded immediately. In
some systems the operator may be switching from one Station to another and not want to be
annoyed by pending calls, just new calls, when the Intercom is inactive.
Calls may either be cancelled by the Intercom being Active, or only by pressing PTT.
When the Active jumper option is chosen, a Call is ignored if the Operator is
Listening or Talking.
When PTT jumper option is used, the Call Tone will sound even if the Operator is listening.
The Call can only be cancelled by the Operator acknowledging the Call, by talking to the
Remote Station.
The ICA-202D has a separate Mute input. The Mute Input affects both channels of the intercom;
however, it does not change the activation state. The mute does affect the
Call Flip-Flop. Mute has the highest priority. When muted, all signals to both Speakers are
squelched. The mute signal is necessary on some systems to allow the Remote Speaker to
switch to a new Station without causing pops in the Operator Speaker. Mute would momentarily
be employed during switching while ‘Listening’ or returning to the ‘Listening’ state.
The PTT (Push to Talk) input activates the Intercom. If the Shut Off input is tied to common,
then PTT only activates the intercom while the signal is asserted.
The Page input has the same functionality as the PTT input, with added features.
The internal Remote Power Amplifier may be enabled, or disabled during a page.
The Operator Microphone is keyed to the Line Level Output.
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