Selecting Update Data To Return; Read Flags Data; Read Meter Data; Coding Examples - Yaesu FT-990 Operating Manual

display, is duplicated by either
VFO
data, or by one
of the memories, unless currently operating on a
retuned memory
(H TUNE
displ~yed}.
Selecting Update Data to R eturn
The 1st and 4th parameters of the .Status Upda le
command allow si;llection of different portions of
the Status data to
be
returned, as follows ("U"is the
1st parameter, ,,.CH"is the 4th):
Parameter
Data~
Returned " c omment
U=()
Ali i ;50S bytes
seGRbM note
below
1·Byte: ~Memory
Curreot, or
IM
Numb~r-1
1
.Last-Select~ d
Memory _
16-BytB' structt:Jre for
U=2
current Operation
IJeither a VFO or Meml
See the Table·
Two t 6-Byte
onpreviqus
U=3 I
~structures
(32 bytes)
p(\ge
for
VfOs
A,&-B
U='4and
1 6,-B~te
structure for
CH">O - S9h
m~;~morv
numbe!r GH
Note thatea.rly
F'r-9.90
fim1ware revi,si<it)S (prior
to rev. 1.3} were only capable of returning all 1,508
bytes. Early sets can be upgraded by contacting
your dea ler. Software written for e@rly versions is
compatible with current versions if the 1st parame·
ter t>f the Update command is always 0.
The 4th Update parameter (CH) is signiiicant
only when the 1s t parameter is 4.
Raad Flags Data
The Read Flags corntnand retrieves only the
three Flag Bytes (and tw.o Model ID bytes). The
Flag Bytes are described on the preceding
p~ge.
The lD bytes
can
be used in a program to distin-
gu_ish the
Ff-990
from other models, wh ich ha.ve
different, unique values rel1Jrned in this situation.
The~constant
values of 09h and 90h are returned by
the
M"-990,
as shown here:
I
Fiag!lite1
I
Fiag
awn I
Flag Byte 3 !IO.Byte 1 (09h\ltOB)' I e2t90hll
Read Meter Data
Sendin~
the Read Meter command causes the
compu ter
to
retu rn a ·digl U.zed 1 ne ter deflection
indication, between 0 and OFFh (in p ractice,
around OFOh maximum). Four copies o f this value
CAT System Computer Control
are returned, along with one· padding byte (QF7h},
as follows:
I Meter Bi'to I
M!iir avte
I M eter
!lv\lJ
I Weier Byte I OF7h
During reception, the signal strength deflection
is ret 1 1 rned, During lransmi!>Sion, the parameter
r-epresented by the reading returned depends on
the setting of U 1e
M ETER
switch.
Coding Examples
Although Yaesu Musen Company cannot offer
to provid!! complete CAT control programs (owing
to the La.rge variety of incompatible computers
u.~ed
by our customers), following a.re a· few exam-
ples o f critical CAT i/o functions, in Basjc. Note
that all variations
of
Basic may not support some
of Ute commands, in which ca,se lllternale algo-
rithms may have to be deVeloped to duplicate the
functions of those shown.
SendiiJg a
Commtmd
After "opening" the computer-'s serial port for
4800-baud, 8 data bits and, 2 stop bits with no
pa.rily,
ll~ S
i/o devic:e/12, any CAT command may be
sent. However, if you determine that your com-
p4 ter may nc-ed·extra time to process datneturned
from the transceiver, you should send the
Pqcing
command
first~
Here
is
an example of Ute
Pacing
command setti ng a 2-rru; delay:
PRINT #2, CHRS(O ) :CHR$(0) :CI!RS(O) :CHR$(2) ; CHR$(&HE) :
Notice
that
the instruction opcode is sent l;tSt,
with the. first
(MSB)
parameter sent just bef9re it,
and the
LSB
parameter (or dummies) sent first.
This means tha t the pa rameters are sent in the
rever~e
order fi'Om that in whidt they appear in the
CAT Commands table. Also . n ote that in this a11d
the following examples,
we
are senqing zeros as
dummy bytes: this is not necessary, however. If
you decide to send commands through a 5-byte
array, the .values o.f lhe d ununy parameters
n~d
not be cle.ared.
Using the same example as on page 31', the fol·
lowing co)nmand could be used to set the fre·
qL,Lency of the display to 14.25000 MHz:
PR!HT 12, CHR$(&H OO): CHI!$(&H50);
C HRt (&1142):
CH~S
{&ItO!.); CHR$ (&ItA);
Notice here that thaBCD values can be sent just
by preceding the deciJl1a1 digits wi th "&H''
in
this
!!«an1ple. However, in an · a ' c tual
pn~g~am
you may
prefer to convert the decimal frequency variable in
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