Software Switching To Maintenance Mode - Javad HPT404BT Operator's Manual

Command Line Interface
Command Line Interface Convention
• To set the mode ordered by CLI commands as permanent User Setting (the setting automatically
selected for the boot-up unit) the SAVE command must be asserted.
• [/?] orders to show the help information for the given command.
• Commands are not case sensitive (unless the GSM and RTN commands): small, none capital
characters can be used to enter CLI commands.
Error Code
0x01
0x02
0x03
0x04
0x05
0x06
0x07

1.1. Software Switching to Maintenance Mode

To switch to Maintenance mode the special byte-sequences with special meanings are used:
• Escape-Sequence: "+++" with 20 ms guard time before and after the command characters
• Escape-Acknowledge: "@00<CR><LF>" 20 ms toggling on CTS control line needed to
acknowledge switching from Data to Maintenance mode and vice versa. In Maintenance mode,
the unit's serial port must keep CTS line always active.
Happy Flow
1. In data-mode the unit starts looking for the Escape-sequence if there is no data from DTE for
more than 20 ms (Start Guard Time).
2. If the unit detects the Escape-Sequence, the Receiver immediately stops forwarding to DTE the
data received over the air and buffers it instead.
3. The radio unit waits for 20 ms and then sends Escape-Acknowledge to DTE if there is no data
from DTE during 20 ms of Stop Guard Time.
4. The unit goes to Maintenance mode and discards Escape-Sequence from input buffer. The modem
is immediately ready to receive commands. At the same time it continues buffering the data
received over the air since step 2.
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Table 1. Command Line Interface Error Codes
Command Syntax Error. A command followed by "/?" displays a command usage.
The parameter has a format error. A command with the certain [Parameter Name] followed by
"/?" displays the format and range of the variable.
The parameter is out of allowed range or it is not allowed to change in the current operation
mode. A command with the certain [Parameter Name] followed by "/?" displays the format and
range of the variable.
The command is not valid for specific radio model. To display the list of available commands,
the HELP command must be used (see "Software Switching to Maintenance Mode" ).
Unspecified Error
Operation is not allowed
Operation failed
Short Description
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