SI2493-D-FS Silicon Laboratories Inc, SI2493-D-FS Datasheet - Page 229

• Manufacturer Part Number: SI2493-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-D-FS

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
The procedure is as follows:
Modem Initialization: (host sends to modem ):
Send and receive tones example:
A summary of the necessary tone transmission AT commands is shown in Table 144.
DTMF Digit
AT+VTS=[941,1336,10]
0x10, 0x2F, 0x31, 0x32, 0x7E
AT+FCLASS=8
AT+VLS=15:
A
B
C
D
0
1
2
3
4
5
6
7
8
9
#
*
Table 144. Ademco
Low Tone (Hz)
1400
941
697
697
697
770
770
770
852
852
852
941
941
697
770
852
941
(enters voice mode)
(goes off hook and starts tone detection)
®
High Tone (Hz)
Contact ID Protocol Tone Transmission AT Commands
Host commands modem to send DTMF digit 0.
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.
1336
1209
1336
1477
1209
1336
1477
1209
1336
1477
1209
1477
1633
1633
1633
1633
----
Rev. 1.3
Contact ID
not used
Digit
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
Digit Value
Contact ID
KISSOFF
N/A
10
12
13
14
15
11
1
2
3
4
5
6
7
8
9
AT+VTS=[941.1336. 10]
AT+VTS=[697.1209. 10]
AT+VTS=[697.1336. 10]
AT+VTS=[697.1447. 10]
AT+VTS=[770.1209. 10]
AT+VTS=[770.1336. 10]
AT+VTS=[770.1477. 10]
AT+VTS=[852.1209. 10]
AT+VTS=[852.1336. 10]
AT+VTS=[852.1477. 10]
AT+VTS=[941.1209. 10]
AT+VTS=[941.1477. 10]
AT+VTS=[697.1633. 10]
AT+VTS=[770.1633. 10]
AT+VTS=[852.1633. 10]
AT+VTS=[1400,0,85]
AT Command
N/A
AN93
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