Panasonic KX-FHD332C Service Manual page 179

Explanation of Signals
Control signals are comprised mainly of 8-bit identification signals and the data signals added
to them. Data signals are added to DIS and DCS signals.
Signal.....DIS (Digital Identification Signal)
Identification Signal Format.....00000001
Function:
Notifies the capacity of the receiving unit. The added data signals are as follows.
Signal.....DCS (Digital Command Signal)
Identification Signal Format.....X1000001
Example (Some models do not support the following items.):
Bit No.
1 Transmitter --- T.2 operation
2 Receiver --- T.2 operation
3 T.2 IOC = 176
4 Transmitter --- T.3 operation
5 Receiver --- T.3 operation
6 Reserved for future T.3 operation features
7 Reserved for future T.3 operation features.
8 Reserved for future T.3 operation features.
9 Transmitter --- T.4 operation
10 Receiver --- T.4 operation
DIS/DTC
179
DCS
Receiver --- T.2 operation
T.2 IOC = 176
Receiver --- T.3 operation
Receiver --- T.4 operation