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5.2. Infrared Chairman Unit TS-821
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1. Infrared emitter/detector
The device used to transmit and receive infrared
communication signals is built inside this panel.
Note
Never place any object that could block infrared
signal access to this part of the unit, as this would
prevent the unit from transmitting or receiving its
required infrared signal.
2. Monitor speaker
Speech signals from other Conference units and
other audio signals from the Central unit are output
from this speaker.
Use the right-side Monitor volume control (18) to
adjust the volume. No sound is output from the
speaker of the unit in use while speaking.
3. Speech indicator
Remains lit while the microphone is in use (during
speech). The indicator flashes when the unit is out
of the communications service area.
4. Talk key
When this key is pressed, both the Microphone in-
use indicator (8) and the Speech indicator (3) light,
and the microphone turns on. Pressing this key
again turns off both indicators and the microphone.
Note: No microphone is supplied with the TS-821.
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5. Priority speech key
Gives speaking priority to the current speaker.
When this key is used for speech, no other delegate
units can be used. Also, only the current speech
made with the Priority speech key is output at the
Central unit’s recording and line outputs.
The key has 2 different operating modes, PTT and
ALT, which can be selected with the Priority speech
key operation setting switch (15).
• When PTT mode is selected, the microphone
only turns on while the key is pressed, during
which time the Speech (3) and Microphone in-
use (8) indicators remain lit.
• When ALT mode is selected, pressing the key
turns on the microphone and causes the Speech
(3) and Microphone in-use (8) indicators to light.
Pressing the key again turns off the microphone
and these indicators.
If Chime is set to sound, a chime tone sounds when
the key is pressed. For the chime setting, use the
Priority chime mute switch (14).
6. Power indicator [POWER]
Lights when the power is switched ON.
This indicator also flashes when the battery level
is low or the unit is outside the communications
service area.
7. Microphone
Use either the TS-923 (Standard) or TS-924 (Long)
dedicated microphone.
8. Microphone in-use indicator
Lights when the microphone is turned on (for
speech) and flashes when the battery level is low.
43. Infrared transmitter/receiver I/O terminals
[INFRARED TRANSMITTER/RECEIVER]
Connect the Infrared transmitter/receiver unit, or
Distributor to these terminals.
By using the YW-1022 (2-branch distributor) and/
or YW-1024 (4-branch distributor), the following
maximum number of Infrared transmitter/receiver
units can be connected: 16 units when they are
all TS-905 units, 12 units when they are all TS-
907 units. (Also 12 units when both models are
mixed.)
44. Functional ground terminal [SIGNAL GND]
Hum noise may be generated when external
equipment is connected to the unit. Connecting
this terminal to the functional ground terminal
of the external equipment may reduce the hum
noise.
Note
This terminal is not for protective earth.
* 0 dB = 1 V
