16
④
Status output terminal
Pin
number
Signal name
Explanation
Terminal
color
10
TALK LED :
OPEN/CLOSE
Talk ON: Close
Talk OFF: Open
Requesting to talk (waiting): blinks
Talk request is rejected: blinks quickly
Black
11
TALK LED :
LOW/HI
Terminal for AT8657/LED and U891RCx
Talk ON: +5 V
Talk OFF: 0 V
On/off operations are synchronized with the open/close operations for the
TALK LED pin (10)
12
FLOOR LED
Selecting the floor channel on the monitor channel
When selected: Close
When unselected: Open
13
LANGUAGE1 LED
Selecting group 1 on the monitor channel
When selected: Close
When unselected: Open
14
LANGUAGE2 LED
Selecting group 2 on the monitor channel
When selected: Close
When unselected: Open
15
LANGUAGE3 LED
Selecting group 3 on the monitor channel
When selected: Close
When unselected: Open
⑤
Operation input terminal
Pin
number
Signal name
Explanation
Terminal
color
16
CHANNEL
Selecting the monitor's channel
Black
17
VOL. UP
Adjusting the headphones' volume
18
VOL. DOWN
19
TALK ON
Request to talk
Yes: Close
No: Open
20
CUT/MUTE
Request to mute/cut microphone
Yes: Close
No: Open
21
TALK ON
(INVERT)
AT8657/LED dedicated terminal
Request to talk
Yes: +5 V
No: 0 V
The function of this pin is the same as that of the TALK ON pin (19)
*When there is a TALK ON or TALK ON (INVERT) request to talk, the
system handles them both as requests to talk.
⑥
Power supply output terminal
Pin
number
Signal name
Explanation
Terminal
color
22
5 V
Power supply for LED is 5 V
Black
23
GND
Power supply GND
⑦
General purpose input terminals (GPI)
Pin
number
Signal name
Explanation
Terminal
color
24
GPI0
General purpose input terminal 0
Black
25
GPI1
General purpose input terminal 1
26
GPI2
General purpose input terminal 2
27
GPI3
General purpose input terminal 3
28
GPI4
General purpose input terminal 4
29
GPI5
General purpose input terminal 5
30
GPI6
General purpose input terminal 6
31
GPI7
General purpose input terminal 7
