Advantech Confidential
Exclusively for Midoriya
EH-7104G Guide ver 1.doc 8 of 10
05/07/20
After the machine has been powered on, the SW3 is ON and SW2 & SW3 are OFF.
The Audio In and Audio out signals from I/O Box are routed to the handset.
Without any program control, the user can pick up the handset from its hook position
to answer the Door/Inter Phone calls from I/O Box.
5.4.
Communication between Handset and Audio Codec
Relay SW Selection Control
Audio Path
Hook Switch
Status
RDI3#
(GOIP23)
RDI2
(GPIO22)
RDI1
(GPIO21)
Handset <-> HT
Off Hook
SWhk ON
1
SW3 OFF
0
SW2 OFF
1
SW1 ON
Audio Code Signal Status
MIC1 Disabled.
LINOUTR
Disabled.
LINOUTL
Enabled. Send the voice data to ear speaker of handset.
LINEINL
Enabled. Get the voice data from handset microphone.
BT878A
Port ID
State
GPIO16
"1" shut down speaker amplifier.
When in this mode, the SW3 needs to be turned off by setting the GPIO23 to be "1",
SW2 is kept off and SW1 must be turned on by setting GPIO21 to be "1". The voice
being recorded by the microphone of handset will be sent to the Audio Code through
LINEINL pin. The voice data being played is sent from the LINOUTL pin of Audio
Codec to the ear speaker of handset.
There is an internal voice loop-back in between the microphone and the ear speaker of
the handset. This feature enables the user to hear what he speaks while speaking. The
built-in speaker should be turned off by setting the GPIO16 to be "1".
刪除
:
1
