Symmetricom Time Server user manual 5 F60 Satellite List Request

Chapter 4: Serial or Telnet I/O Functions Function Commands

4.3.5F60 – Satellite List Request

Use Function 60 to list current satellites and to see the relative signal strength of satellites the unit is tracking. Signal strength is given in units in the range of 0 to +25.

The unit monitors five variables: the prn number, good/bad, enabled/disabled, tracked, and current.

To request the list, send the following command:

F60<Enter>
where
F	=	ASCII character F
60	=	function number
<Enter>	=	input line terminator
The unit responds:

F60<SP>prn NN<SP>good<SP>enabled<SP>tracked<SP>current<SP> sig<SP>level<SP>= +<LEVEL><CR><LF>

where

prn NN	=	pseudo-random number; the prn number is a unique
		identifier for a particular satellite’s communication
		path; for example, satellite 3 might have the prn
		number 15; if that satellite is recalled to Earth and
		replaced by satellite 42, the communication path of
		satellite 42 might also be assigned prn 15
enabled/disabled	=	“Enabled” refers to a factory default configuration
		value that allows the GPS to track all satellites on
		the F60 list
good/bad	=	“Good” means all three of the following apply:
		• the satellite is visible, and
		• the satellite’s ephemeris and almanac data report
		the satellite’s health as “good”, and
		• the satellite reports its own health as “good”
		“Bad” means at least one of the following applies:
		• the satellite is not visible, or
		• the satellite’s ephemeris and almanac data report
		the satellite’s health as “bad”, or
		• the satellite reports its own health as “bad” (for
		example, during maintenance periods)
tracked	=	“Tracked” means that the unit is tracking this
		particular satellite
current	=	“Current” means that the unit is both tracking this
		satellite and using the satellite’s communication to
		calculate accurate time; an example from the list is
		prn 3
<CR><LF>	=	line terminator

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