Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 235)

AN93
Rev. 1.3 235
9.2. SMS AT Command Set
Table 146 shows the AT commands that the host (DTE) uses to control the transmission or reception of SMS
messages.
Table 146. AT Commands for SMS
AT Command ISOmodem Response Description
&D1 OK ESC (pin 22) escapes to command mode from data
mode if also enabled by HES (Enable Hardware
Escape Pin): U70, bit 15.
&D2 OK ESC (pin 22) assertion during a modem connection
causes the modem to go on-hook and return to com-
mand mode. The escape pin must be enabled by set-
ting bit HES: U70, bit 15.
+FCLASS=256 OK Enables SMS mode
DTXXXX; OK Originate modem dials XXXX, then goes back into
command mode.
DT; OK Answer modem picks up the line and goes back into
command mode.
+FRM=200 CONNECT 1 or
CONNECT 2
Receive modem goes into data mode and waits for
FSK data from Transmit modem; response is deter-
mined by whether a Protocol 1 or 2 message was
received.
+FTM=201 CONNECT Transmit modem goes into data mode and waits for
data from the DTE. Sends marks when first data byte is
received, followed by data.
+FTM=202 CONNECT Transmit modem goes into data mode and waits for
data from the DTE. When first data byte is received,
modem sends Channel Seizure and marks followed by
data.