KX-TG2560B, KX-TG2560S - Panasonic Telephone Service Manual (repair manual). Page 15

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Pre data 2   DATA 0 or DATA 1     D       DATA 0 or DATA 1      D

   Continue        D     

•c •c •c

13 bit

DATA Delimit

  Pulse DATA

Pre data 2   DATA 0 or DATA 1     D       DATA 0 or DATA 1      END data

When executing Pulse Dial, the Pulse Dial DATA is transmitted from the Handset to the Base Unit in above format.
The combination of DATA 0 and DATA 1 are changed by each Dial No. And the DATA Delimit is between each Frame as a stop.
The number of Frame is 2.

  Tone DATA

13 bit

DATA Delimit

When executing Tone Dial, Tone Dial DATA is transmitted from the Handset to the Base Unit in above format.
The DATA is changed by Dial No. as same as Pulse Dial. When Tone Dialing, DATA (Continue DATA) that the key is pressed
continuously is sent to the Base Unit during the key is pressed.

     

1,000,000 kinds of the security code are available for the model

KX-TG2570B/KX-TG2570S. Each time the handset is set on the

cradle of the base unit (for charging), the CPU automatically

change the security code.