Read Panasonic KX-DT333RU Service Manual online
10
KX-DT333RU/KX-DT333RU-B
4.2.6.
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 received from PBX is inputted to the comparator (pin 68) built in IC2 through Pulse Trans T1. The threshold voltage of
the comparator is determined by R19 to 21 and inputted to pin 67 and 69.
The data to PBX is outputted from pin 70 and 71 of IC2, drives T1 by Transistor Q1 and transmitted.
the comparator is determined by R19 to 21 and inputted to pin 67 and 69.
The data to PBX is outputted from pin 70 and 71 of IC2, drives T1 by Transistor Q1 and transmitted.
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