Read Panasonic KX-DT521RU Service Manual online
8
KX-DT521RU/KX-DT521RU-B
4.2.3.
Data Communication
Function
The data communication circuit serves the following functions:
Information exchanger between PBX and proprietary telephone, key input information as well as data for the LED control, LCD
control, voice data, etc. This information is continuously exchanged at all times.
Information exchanger between PBX and proprietary telephone, key input information as well as data for the LED control, LCD
control, voice data, etc. This information is continuously exchanged at all times.
Circuit Operation
The data from PBX is input to the comparator (pin 27) built in IC300 through Pulse Trans T300. The threshold voltage of the
comparator is determined by R306, R307 and R308. It is input into pin 26 and 28 of IC300.
The data to PBX is output from pin 32 and 33 of IC300, drives T300 by Transistor Q301 and transmitted.
comparator is determined by R306, R307 and R308. It is input into pin 26 and 28 of IC300.
The data to PBX is output from pin 32 and 33 of IC300, drives T300 by Transistor Q301 and transmitted.
+
-
JK300
1
2
3
4
5
L301
L302
D300
1
2
3
4
T300
1
2
4
5
6
7
10
9
8
DG
R301
R302
R303
D301
1
2
2
3
VDD33
VDD33
DG
VDD33
VDD33
R309
R310
R311
DG
C303
C302
C301
L
H
T
R
C305
C304
R30
6
R30
7
R308
C30
6
C310
C311
Q301
1
E1
2
B1
3
C2
4
E2
5
B2
6
C1
R305
R304
C307
C308
DG
PG
C309
TO PBX
33
PDX0
PDX1
32
PVRH
28
PDR
27
PVRL
26
IC300
ASIC1
DG
DG
Received Data from PBX
Transmitted Data to PBX
Between Hand L
JK300(H-L)
JK300(H-L)
TIMING CHART FOR DPT DATA COMMUNICATION
From Format
SYNC
Dch
Cch
B1 ch
B2 ch
MAM
SYNC
B1 ch
B2 ch
MAM
Dch
Cch
Parity
Parity
PDR
IC300(pin 27)
IC300(pin 27)
PDX0
IC300(pin 33)
IC300(pin 33)
PDX1
IC300(pin 32)
IC300(pin 32)
125us / frame
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