AN93

Table 145. Ademco® Mode of Operation (Continued)

Step

DTE-to-Modem Command

Modem-to-DTE

Remarks

 

 

Indication

 

 

 

 

 

15

AT+VTS=9,9,9,9,1,8,1,*,#,A,0,0,0,0,0,3

OK

First Data Block is transmitted.

 

 

 

Note: Data octets are placed

 

 

 

after the “=” and separated by

 

 

 

commas.

 

 

 

Note: Host DTE driver must per-

 

 

 

form these substitutions,

 

 

 

Octet B as *

 

 

 

Octet C as #

 

 

 

Octet D as A

 

 

 

Octet E as B

 

 

 

Octet F as C

 

 

 

Note: OK is sent at end of trans-

 

 

 

mission.

 

 

 

 

16

Wait for Kissoff tone

 

 

 

 

 

 

17

 

 

1.25 s has elapsed. But modem

 

 

 

still has not reported <DLE><c>

 

 

 

to DTE

 

 

 

 

18

AT*Y254:Q83FB

01AF

Check to see if start of a Kissoff

 

 

 

Tone has been detected?

 

 

 

A non zero response (i.e. not

 

 

 

0000) from modem denotes start

 

 

 

of tone is detected. Modem will

 

 

 

send <DLE><c> to DTE after it

 

 

 

has verified that the Kissoff Tone

 

 

 

burst duration is valid.

 

 

 

 

19

 

<DLE><c>

Acknowledgement from

 

 

 

RECEIVER detected.

 

 

 

Note: <DLE><c> is sent at end

 

 

 

of tone burst.

 

 

 

 

20

Delay 250 ms before sending next Data Tone

 

 

 

Message.

 

 

 

Repeat from Step 15 for sending more Data

 

 

 

Codes

 

 

 

 

 

 

 

ATH

OK

Hang up at end of session.

 

 

 

 

232

Rev. 1.3

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Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Wait for Kissoff tone, Ath