8
character followed by a two-character identifier. Valid tags are replaced dynamically. Obviously the
most useful tag to include is the #FQ tag, which displays the frequency on the display.
If you connect a GPS receiver to discipline the oscillator, you can also display a variety of information
from the GPS, including date, time, latitude, longitude, altitude, ground speed, and 4- or 6-character
Maidenhead locator (converted from latitude and longitude).
The default setting for Line 1 is as above. It shows the frequency centred on the top line of the
display. At the top right corner the #EE tag causes an “E” to be displayed in the event of a frequency
range error in either the Clk0 or Clk1 outputs. The error can be cleared by tuning to a valid within-
range frequency. The range of the Si5351A output is approximately 3.5kHz to 292MHz. The default
setting for Lines 2..4 is just blank. You can edit it for your own fixed display or include valid #tags as
described below, to dynamically update display data with GPS information such as time, date etc.
The following table lists the available tags:
Tag
Example:
Explanation:
#FQ
10,000,000
VFO Frequency (note Clk1 frequency includes IF Offset and Multiplier)
#C1
45,000,000
Clk1 output frequency
#RF
27,003,968
Measured 27MHz reference oscillator frequency
#EE
E
Single character error flag. Blank if there is no error. E if there is an error.
#ER
ERR
Three character error flag. Blank if there is no error. ERR if there is an error.
#TR
100 kHz
Current tuning rate, occupies 7 characters. 1Hz (min) to 10MHz (max)
#HH
10
UT hours (24-hour format, from GPS data)
#MM 43
UT minutes
#SS
58
UT seconds
#LH
01
Local time hours (24-hour format, converted from GPS data)
#LM
43
Local time minutes
#H2
10
Local time hours (12-hour format)
#AP
AM
Local time AM/PM indicator
#GV
A
GPS validity flag (“A” = valid, “V” = invalid, “-“ = no GPS data)
#GG
3D
GPS fix status (“3D” = 3D fix, “2D” = 2D fix, “No” = no fix, “--“ = no GPS data)
#GF
08
Number of satellites used in solution comp
utation (“--“ = no GPS data)
#GT
12
Number of satellites being
tracked (“--“ = no GPS data)
#GS
31
Average signal to noise ratio of tracked satellites (“--“ = no GPS data)
#DD
06
Day of UT date (“--“ = GPS data invalid)
#DM
Apr
Month of UT date (3 letters format; “--“ = GPS data invalid)
#DY
15
Year of UT date (2 numbers format; “--“ = GPS data invalid)
#HB
[Note 1]
1pps heartbeat (see Note 1 below)
#M4
IO90
4-
character Maidenhead locator (“----“ = GPS data invalid)
#M6
IO91CG
6-
character Maidenhead locator (“------“) = GPS data invalid)
#LT
22°32`1799N
Latitude (blank if no GPS data)
#LN
114°01`1823E Longitude (blank if no GPS data)
#AT
84.0
Altitude (blank if no GPS data)
Note 1
: The heartbeat is a single-character heartbeat symbol, it beats in time with the received 1pps
signal, if a GPS receiver module is being used.
