SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 241

• Manufacturer Part Number: SI2457-D-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FT

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

For Figure 39, assume that the originating modem transmits first and that the two modems alternate transmitting
and receiving. For simplicity, this figure does not show the provisions for timeout cases.
Se nd Ma rks
N
N
messa ge fol low ed
si len ce , then ESC
80 bi ts of ma rk
AT+FTM =20 1
Da ta recei ved
by 15 0 ms o f
CONN ECT
Ho st sen ds
Co mmand
from Host
ESC to
Mod e
?
?
Y
Y
Figure 39. SMS Process in Host and Modem
1
Sen d Marks
ATD Txxxx ;
Pr otocol
OK
?
Rev. 1.3
N
N
2
messag e fo ll owe d
sil en ce , th en ESC
( altern atin g 1 's &
30 0 bits chan nel
8 0 b its of mark
AT+FTM =202
Data re ceive d
by 15 0 ms of
CONNEC T
Host send s
Co mma nd
fro m Ho st
O
se izure
ESC to
Mo de
0 's)
?
?
AT+FCLASS = 2 56
(V.2 3 h alf -du ple x )
Y
Y
Orig ina te
H ES = 1
?
A
Implicit +FRM
R ecei ve messag e ,
AT +FRM =2 00
CONN ECT n
send to Ho st
n = 1 o r 2
ATDT ;
OK
OK
AN93
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