SI2457-D-FS Silicon Laboratories Inc, SI2457-D-FS Datasheet - Page 231

• Manufacturer Part Number: SI2457-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FS

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

Step
10
11
12
13
14
7
8
9
AT:U181,78,0,0,1C
ATDnnnnnnn
AT+VTD=5;:U48,32
Wait for RECEIVER to answer with handshake tones
AT:U181,334,0,0,12C
Delay 250 ms before transmitting Data Tones
message.
DTE-to-Modem Command
Table 145. Ademco
®
Mode of Operation (Continued)
Rev. 1.3
Modem-to-DTE
i.e. 0x10, 0x63
i.e. 0x10, 0x65
<DLE><e>
Indication
<DLE><c>
OK
OK
OK
OK
Set up 1400 Hz detector to
detect 100 ms Handshake tone
burst.
Call RECEIVER station.
Change DTMF on off time to pre-
pare for Data Tones transmis-
sion.
1400 Hz tone burst detected
Note: First part of Handshake
Tones detected.
2300 Hz tone burst detected
Notes: Second part of Hand-
shake Tones detected.
Since there is a 100 ms silence
between the 1400 Hz and
2300 Hz tones, the <DLE><e>
message should come nomi-
nally 200msec after the previous
<DLE><c> message.
It is the responsibility of the host
DTE driver to measure and vali-
date this time period.
Change 1400 Hz detector to
detect 800 ±300 ms tone burst,
i.e. Kissoff tone.
Host DTE should adjust this
delay so that the following +VTS
DTMF transmission will start
between 250 to 300 ms after the
reception of <DLE><e> above.
Remarks
AN93
231