4.7 Novella protocol emulation

The sat-nms beacon receiver provides a Novella remote protocol emulation on the serial RS232 interface. To enable this mode, at the Setup page set the 'Novella emulation' setup parameter to 'ON'. At the same place you set the protocol address 'A' ... 'G' (NONE makes no sense as the Novella receiver does not support a plain terminal protocol).

The Novella protocol emulation replicates the 'operational' parameters of the Novella receiver, They are in particular:

• 'S' --- status requestThe receiver replies with the Novella status string 'RFxxxxxxxxyyyz' in the given protocol frame. 'RF' at the beginning states that the receiver is in remote mode. 'xxxxxxxx' is the actual receive frequency in kHz, using a fixed format with leading zeroes. 'yyy' signals the actual receive level as a 3 digit hexadeciamal number. The value 000 - fff resembles the analog output voltage (0..10V) of the receiver. You may use the appropriate setup parameters to scale the output for your needs. Finally, the last character reports the summarized fault status of the receiver. An asterisk ('*') reports a fault, the underscore character ('_') stands for OK.
• 'L' --- set localSets the device to local mode. The sat-nms receiver does not distinguish between local and remote states. It ingores the command and replies it like the Novella receiver with the statrus string described above.
• 'R' --- set remoteSets the device to remote mode. The sat-nms receiver does not distinguish between local and remote states. It ingores the command and replies it like the Novella receiver with the status string described above.
• 'F' --- set frequencyWith this command the receivers frequency is set. The letter F must be followed by the receive frequency in kHz, formatted as an integer value, 8 digits with leading zeroes. Unlike the Novella L-band device, the sat-nms beacon receiver applies the the LO frequencies set at the setup page to this value. If you want to resemble the Novella receiver exactly, set the LO frequencies to zero.

Other commands are rejected as 'unknown command' by the sat-nms receiver.