Read Panasonic KX-DT390RU Service Manual online
8
KX-DT390RU/KX-DT390RU-B
4.2.3.
Data Communication Circuit
Function:
The data communication circuit serves the following functions:
Exchanges information between the PBX and DSS console and key input information as well as data for the LED control, etc. This
information is exchanged continuously at all times.
Exchanges information between the PBX and DSS console and key input information as well as data for the LED control, etc. This
information is exchanged continuously at all times.
Circuit Operation:
When the DSS console receives an IRQ signal from the PBX, after it sends the key input information (19 pulses) to the PBX and
receives the data (47 pulses) for the LED control, etc., the DSS console will send an acknowledge signal to the PBX.
receives the data (47 pulses) for the LED control, etc., the DSS console will send an acknowledge signal to the PBX.
1) Reception
The data from the DSS console is received via the H and L line along the path shown below.
H, L Line
H, L Line
→ D1 → T1 → R24 → Q2 → IC1 Pin 24
2) Transmission
The data to the DSS console is transmitted along the following path.
IC1 Pin 12
IC1 Pin 12
→ R22 → Q1 → T1 → D1 → H, L Line
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