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Hermes Operator Note Page 10 of 32
4 LIST OF COMMANDS:
4.1 Command Mode
The modem is configurable through the RS232 port. The Command Mode
has to be activated to do this, as detailed in the following paragraphs:
4.1.1 Activation of the Command Mode:
The Command Mode is activated with the string:
<wait>+++<wait> <CR><LF>
Where <wait> is a programmable period after transmitting data (which is set
by register S154) which has a nominal value of 10ms.
The modem responds with:
OK<CR><LF>
The modem is now ready to be configured. Transmitting or reception is
blocked during Command Mode.
If the "+++" string is input without a <CR><LF> then the string is transmitted
as normal data. Note that one or more consecutive “+” characters in the
input data are held in the modem until it is determined that it is not a “+++”
string.
The configuration mode is only accepted if the RTS line is set. The “+++”
string is only accepted if this string is the first three characters and there has
been no data for greater than the time set by register S154.
The +++ string is only transmitted over the air if embedded in a data string as
described above.
Important: any configuration changes made are only saved to the
non-volatile memory after a write command (AT &W).
Note that the communication parameters (baudrate etc) are the programmed
parameters.