Below you can find table which explains how the packet of P100 protocol looks like and what can be the values for each part of the packet.
1 character, Indicates the type of alarm:
1 = Alarm with voice communication
2 = Operational failure
3 = Self test alarm
Data length: 1 character, Indicates the length of the data field.
Data: 0 - 15 characters.
Checksum: 2 characters.
The checksum is calculated by summing the alarm type, the data length and
all the characters in the data field. The resulting sum is converted to
hexadecimal format and inserted as a 2 character checksum (00h - FFh).
Signalling is done via DTMF. Standard tone length 100 ms +/- 5 ms, pause 100 ms +/- 5 ms. For the 2N® Lift1 this can be adjusted in a range of 60 – 140 ms. The parameter for the adjustment is displayed on the screen below.
Tones used in the data packet
0 – 9 = DTMF 0 – 9
10 - 13 = DTMF A – D
14 = DTMF *
15 = DTMF #