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

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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

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Contents Specialist RF Designs Lattice House Baughurst Basingstoke UK RG26 5LPTel +44 0 118 981 Fax +44 0 118 981 Table Of Contents Received Signal Strength Indication Rssi AT S156Handshaking Operation During Transmit and Receive List of Figures List of TablesIntroduction RS232 Connector Connections & IndicationsPin No Function Power Connector RF ConnectorFront Panel Indications Modem Operation IntroductionData Transfer Modes RS232 Data HandlingReceive-to-Transmit Turnround Time ms DescriptionMAX List of Commands Command ModeOkcrlf Command Syntax ErrorcrlfBaud Rate AT B0 Parity ATB1Format Mode AT F AT F?CRLFEngineering Test Modes AT OK CrlfRXX, Dxxxcrlf Command Mode Guard Time AT S154 Software Version Information ATATI9CRLF Centre Radio Frequency AT S155Rssi Level Level at RF Input dBm ±2dB Radio Channel AT S157 Data Quality AT S158Squelch AT S159 Squelch Level Level at RF InputTransmission Power AT S160 Output Power for 1W G-MAX Output Power for 2W G-MAXPower Level Output Power DBm Tolerance Nominal Level NominalChannel Step Size AT S161 Test Message Period AT S162Over-Air Symbol Rate AT S163 Note engineering function only Preamble Period AT S165 Note engineering function onlyInvert Symbol AT S167 Frame Synch Tolerance AT S166 Note engineering function onlySquelch Delay AT S168 Restore defaults AT &Y8 Radio Frequency AT &FSave parameters AT &W AT &WCRLFDisplay parameters ATT? ATT?CRLFDo not enter unless you wish to carry out a code load Ppppppppppppppppppppppppppppppppppppppppppppppppppppp Hardware Specification RS232 Port ParametersRadio Specifications Parameter Max SXn50Mechanical Specification EnclosuresFront View of Casting Vibration Specifications Operating conditionsType Approvals EMC