CipherLab 8400 GPRS Cradle, Reference Manual

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2.1 DIALING OUT
When the mobile computer is seated in the cradle, it can send the collected data back to
a remote server, as well as download lookup files, via GSM or GPRS.
When dialing out ( ATDT ), the READY indicator will be flashing and become solid after
successfully establishing a connection. The DATA indicator will flash as long as data
transmission occurs.
Note: It is suggested to issue the command “ AT ” every five seconds for best practice, in
order to check whether the mobile computer is seated in the cradle.
The escape sequence, consisting of three characters “
+++ ”, is used to terminate
the data connection.
2.1.1 GSM CONNECTION
When initialization is done, issue ATDT (phone number) to establish data connection via
GSM.
2.1.2 GPRS CONNECTION
When initialization is done, issue ATDT xxx.xxx.xxx.xxx:kkkk or ATDT [HostName:Port] to
establish data connection via GPRS. The buffer size of the cradle is 1460 bytes, and data
packet will be sent out as long as it satisfies any of the following requirements:
buffer is full (= maximum packet size is 1460 bytes)
delimiter character is encountered
end of transmission timeout (= no transmission for 5 milliseconds)