Symmetricom Time Server User Manual download pdf (Page 70)

4-56 TimeVault™ User’s Manual 6000-100Ch4.fm Rev. D

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

4.3.5 F60 – 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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Symmetricom Time Server User Manual Page 70

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