Silicon Laboratories SI2494/39 Ademco Contact ID Protocol Tone Transmission AT Commands, Kissoff

AN93

8.2.1. Modem Specific Implementation Details

The DTMF transmitters and receivers are used to send and receive data. Voice mode operation documented in chapter X is used to transmit and receive the tones.

A summary of the necessary tone transmission AT commands is shown in Table 144. The procedure is as follows:

Modem Initialization: (host sends to modem ):

AT+FCLASS=8	(enters voice mode)
AT+VLS=15:	(goes off hook and starts tone detection)
Send and receive tones example:
AT+VTS=[941,1336,10]		Host commands modem to send DTMF digit 0.
0x10, 0x2F, 0x31, 0x32, 0x7E		Modem responds with 5 characters as it receives two DTMF tones:
		1 and 2. There are 2 preamble and 1 postamble characters
		in this example.

Table 144. Ademco® Contact ID Protocol Tone Transmission AT Commands

DTMF Digit	Low Tone (Hz)	High Tone (Hz)	Contact ID	Contact ID	AT Command
			Digit	Digit Value
0	941	1336	0	10	AT+VTS=[941.1336. 10]
1	697	1209	1	1	AT+VTS=[697.1209. 10]
2	697	1336	2	2	AT+VTS=[697.1336. 10]
3	697	1477	3	3	AT+VTS=[697.1447. 10]
4	770	1209	4	4	AT+VTS=[770.1209. 10]
5	770	1336	5	5	AT+VTS=[770.1336. 10]
6	770	1477	6	6	AT+VTS=[770.1477. 10]
7	852	1209	7	7	AT+VTS=[852.1209. 10]
8	852	1336	8	8	AT+VTS=[852.1336. 10]
9	852	1477	9	9	AT+VTS=[852.1477. 10]
*	941	1209	B	11	AT+VTS=[941.1209. 10]
#	941	1477	C	12	AT+VTS=[941.1477. 10]
A	697	1633	D	13	AT+VTS=[697.1633. 10]
B	770	1633	E	14	AT+VTS=[770.1633. 10]
C	852	1633	F	15	AT+VTS=[852.1633. 10]
D	941	1633	not used	N/A	N/A
	1400	----		KISSOFF	AT+VTS=[1400,0,85]

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