Technical information

Chapter 1: Product Features
August 5, 2008 AT Commands Reference Manual 1-13
• When a data byte has the same code as EOF character, a two byte sequence of ESC and EOF
characters is sent instead.
• When a data byte has the same code as ESC character, a two byte sequence of ESC and ESC
characters is sent instead.
• When end of file is reached, EOF character is sent.
To decode a file from FTP File Transfer Format, the user or G24 will read each data byte from the
source file and will perform the following operations:
• When a data byte has the same code as ESC character and next data byte is ESC or EOF
character, the first byte should be ignored.
• When a data byte has the same code as EOF character and previous data byte is not ESC
character, end of file is reached.
The process is illustrated in Figure 1-3.
Figure 1-3: Files Transfer Process
Other FTP Operations
G24 provides +FTPINFO feature that allows the user to receive more information about FTP
connection and FTP commands execution. When the feature is enabled, all FTP commands send
by G24 to the remote server and all FTP responses, received by the G24 from the remote server
are printed to the user as AT+FTPINFO: <text> unsolicited response. Use the AT+FTPINFO=1
for the feature enabling, and the AT+FTPINFO=0 for the feature disabling in any G24 operation
time, when G24 is in command mode.
Interaction with Other MIP Commands
Interaction with +MIPODM Command
The external ODM session is prohibited when FTP feature is executed, because FTP feature data
connection is based on socket, opened for ODM (internal ODM session), so, when G24 receives
+MIPODM command within FTP connection, the error code: 302 (FTP session is active) is
returned to the user.
Interaction with +MIPOPEN and +MIPCLOSE Commands
The user cannot initiate FTP connection with +MIPOPEN command as well as close FTP
connection with +MIPCLOSE command. However, +MIPOPEN and +MIPCLOSE commands in