Installation Instruction

Ref : SCT TMO MOD SPEC 662

Rev.: B

Ref. sec. :

Date:

18/11/2004

Document

. All rights of reproduction and disclosure reserved.

MO2XX module – Confidential under NDA

Page 67/67

Modem Tx

DTE Tx

COMMAND

ATH

COMMAND

Suspended data mode

Command mode

1.2.8. Timeout case

If modem didn’t receive the DTE_ESCAPE_STR after a timeout (2s), it send again his

MOD_ESCAPE_STR and wait for DTE_ESCAPE_STR as long as the MOD_ESCAPE*_CMD signal

is active. After 3 retry, module closes the MUX mechanism.

Modem Tx

DTE_ESCAPE_CMD

DTE Tx

MOD_ESCAPE_CMD

MOD_ESCAPE_STR

DATA

COMMAND

DATA

DTE_ESCAPE_STR

COMMAND

Time out

MOD_ESCAPE_STR

Wait for

DTE_ESCAPE_STR

Remarks:

If MOD_ESCAPE_CMD returns in inactive mode and the escape string hasn’t been received by the

modem, we have to resume the data connection.

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