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Check Spectrum Analyzer External Reference – Control Byte #134 (86h)
Description: Checks to see if Spectrum Analyzer external reference is present. If it is, it then checks to see if it is at the
correct frequency for PLL locking.
Bytes to Follow: 0 bytes
Site Master Returns: 1 byte
On Success:
1) 00h – Reference present and at the correct frequency (PLL functioning)
01h – Reference is not present
02h – Reference is present, but internal PLL and external frequency do not match up.
or
On Error:
1) 224 (E0h) Parameter Error – Not in External reference mode
238 (EEh) Time-out Error.
Set SPA Preamp State (On/Off/Auto) – Control Byte #136 (88h)
Description: Sets the state of Spectrum Analyzer preamplifier.
Setting the preamp state to ON or OFF sets the preamp coupling to manual. That is, the preamplifier state is controlled
independently of all other parameters.
Setting the preamp state to AUTO couples the preamp state to the reference level and the attenuation. If the attenuation is
automatically coupled to the reference level, the preamp will turn on when the reference level is set less than -26 dBm. If the
attenuation is manually coupled to the reference level, the preamp will turn on when the value of (attenuation – reference
level) >= 51.
Bytes to Follow: 1 byte
1) Mode (00h = Off, 01h = On, 02h = Auto)
Site Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error: Invalid state
238 (EEh) Time Out Error
Set Spectrum Analyzer Units – Control Byte #140 (8Ch)
Description: Sets the scale type (logarithmic or linear) and the units.
Linear units can be:
01h = Volts
02h = Watts
Logarithmic units can be:
03h = dBm
04h = dBV
05h = dBmV
06h=dBmV
Bytes to Follow: 2 bytes
1) Scale Type (00h = Linear, 01h = Logarithmic)
2) Units
Site Master Returns: 1 byte
92 Site Master PM