Installation Instruction

Ref : SCT TMO MOD SPEC 662
Rev.: B
Ref. sec. :
Date:
18/11/2004
Document
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. All rights of reproduction and disclosure reserved.
MO2XX module – Confidential under NDA
Page 65/67
1.2.3. State diagram
1.2.4. Transition (1): Command -> Data
The data connection is established when the PDA receives the “CONNECT: <
speed
>” message
from the SB.
CONNECT:9600
Modem Tx
Command mode
Data mode
Remark:
The Connect message is different between voice call, a classical data connection, a GPRS data connection
and a fax call, so it is necessary to treat the entire message to separate the data and voice calls.
1.2.5. Transition (2): Data -> Suspended Data
The modem or the DTE can request this transition, so it is necessary to distinguish two cases.
1
st
case
: the DTE orders the modem to go in the suspended data mode
1. The DTE indicates the order by moving
MOD_ESCAPE*_CMD
and then begins to search in the data flow the
MOD_ESCAPE_STR
from the modem.
2. When the modem is ready, it sends the
MOD_ESCAPE_STR
string and it wait for
DTE_ESCAPE_STR
.
3. When receiving this string, the DTE then move back
MOD_ESCAPE*_CMD
and sends the
DTE_ESCAPE_STR
, which indicates to the modem every byte after that must be considered as part as an AT
Command
Modem Tx
DTE_ESCAPE_CMD
DTE Tx
MOD_ESCAPE_CMD
MOD_ESCAPE_STR
DATA
COMMAND
DATA
DTE_ESCAPE_STR
COMMAND
Wait for
DTE_ESCAPE_STR
DTE : MOD_ESCAPE*_CMD
OR
Modem : DTE_ESCAPE_CMD
Already implemented
COMMAND
DATA
SUSPENDED
DATA
DTE : +++
DTE : ATO
DTE : ATO
DTE : ATH
OU
Modem : NO CARRIER
To be defined
2
4
3
1