Command Line Interface
Command Line Interface Convention
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Table 1. Command Line Interface Error Codes
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>”.
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 transmitter continues sending over the air the data received from DTE before 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.
Escape-Sequence in Data
During its waiting in step 3, the unit receives data from DTE:
• The unit sends buffered Escape-Sequence from DTE to the air;
• The unit sends all buffered data received from the air since step 2 to DTE and stays in data-mode
(i.e. transmits data received from DTE over the air – including the just received, unexpected, data
and forwards data received over the air to DTE.)
1.2. Switching to Data Mode
• DTE sends the CLI command “DATAMODE<CR>” or „DATAMODE<LF>” to the unit.
Error Code
Short Description
0x01
Command Syntax Error.
0x02
The parameter has a format error.
0x03
The parameter is out of allowed range.
0x04
The command is not valid for specific radio model.
0x05
Unspecified Error
