Jenn-Air 1300 Radio Frequency AT &F, Save parameters AT &W, At &Wcrlf, Restore defaults AT &Y8

4.24Radio Frequency (AT &F)

The Hermes is programmed with a factory set centre frequency that is the centre of the RF switching band. A new frequency can be entered directly within the ±99 channels of the centre frequency using this command. The channel number is re-calculated for the frequency entered using this command.

The radio frequency of the modem is set as follows:

	AT &F=nnn.nnnnnn<CR><LF>
Where:	nnn.nnnnnn is the format of the input string for the
	frequency in MHz
Default:	none
Read:	AT &F?<CR><LF>
Read Return:	nnn.nnnnnn<CR><LF>
Example:	AT &F=458.5<CR><LF> sets 458.5MHz
	AT &F=458.500000<CR><LF> sets 458.5MHz

Note that frequencies in multiples of either 12.5kHz or 10kHz only are acceptable. If a whole number of MHz is entered a “.” must be entered before the <CR><LF>.

If the frequency entered is outside the ±99 channels, or the frequency is invalid, the modem responds with the following error message and the entry is ignored:

ERROR<CR><LF>

4.25Save parameters (AT &W)

To permanently store any parameter changes, the parameters are saved in non-volatile memory. The command for this is:

AT &W<CR><LF>

4.26Restore defaults (AT &Y8)

To quickly check the operation of the modem, the factory settings can be loaded. If required the AT &W save command can be used to save the defaults. The command for this is:

AT &Y8<CR><LF>

Hermes Operator Note Page 24 of 32