Table of Contents
Advertisement
SECTION
12.
PROGRAM
CONTROL INSTRUCTIONS
the start
of
the instructions to execute
if
the test
condition
is
false (Figure
3.8-1). The
Else
Instruction
is
optional;
when it
is
omitted,
a
false
comparison
will result in execution branching
directly to
the End Instruction. Instruction
94
has no parameters.
*** 95
END
***
FUNCTION
Instruction 95 is used
to indicate the end/return
of a subroutine (lnstruction 85), the end of
a
loop (lnstruction 87),
the end of an
lf
Then/Else
sequence,
or
the end of the Case statement
(lnstructions 88-93
when used with command
30).
The End Instruction has no parameters.
*** 96
ACTIVATE SERIAL DATA OUTPUT ***
FUNCTION
Instruction
96 is used instead to activate the
tape, Storage Module, or serial port
output.
By
using Program
Control Instructions to allow
execution
of Instruction 96 only
at
certain times,
the user can control when the output
is
active.
When used to send data to the SM192 or
SM716
Storage Module, the 21X can determine
whether
or
not
the Storage Module
is
connected.
lf
the Storage Module is not
connected, the data
will not be sent until it
is
connected.
Instruction 96 also allows for
faster
data output via the serial port with
the Binary
Option, which
outputs FINAL STORAGE
FORMAT
(2
bytes per low resolution data point)
instead
of
ASCII (10 bytes per data point,
Section
4.5). Appendix
C
describes FINAL
STORAGE
FORMAT. Section 4.3 describes
Tape output.
A single parameter is used to select whether
the
instruction
is
to
controlthe tape, Storage
Module, or
the printer output, and
if
the printer
is
selected, the format and baud
rate.
Instruction
96 must be entered separately for each output
device
used.
lnstruction
96 uses the same Tape and Printer
pointers as
the *8 and *9 modes which can
be
used
to get a residual or paftial dump of
Final
Storage (Section
4).
Note that the Tape output
will not activate until at least
512 Final Storage
Locations have been stored.
PAR.
NO.
12-6
Do not use
*4
to activate
a
device
that
is
activated
by Instruction
96.
DATA
TYPE
DESCRIPTION
Option
OO
--
TAPE
The left digit specifies the
and
the right specifies the baud
rate
for
the
printer.
The code
tape must
be
00, and
for
Storage Module it is
30.
X
= Baud
0--
1X
-- PRINTER.
ASCII
1
.-
1
2X
-- PRINTER,
Binary
2
--
30 -- SM192 or
SM716
3
--
76
31 -- Send filemark to SM192/716
*** 97
INITIATE
***
TELECOMMUNICATIONS
Instruction
97 is used to have the 21X initiate
telecommunications in response to certain
conditions. When the instruction is executed
with
the interrupt disable flag set low, the 21X
will make
a
calland
send
the lD number
specified in Parameter
I
(in
ASCII
at
the
specified baud
rate). The lD
number
will
be
every
4
seconds
untilthe 21X
receives a
response
or
the
time specified in Parameter
3
expires. The expected
response
is
to have the
lD sent back to the 21X,
at
which time the 21X
will
go into telecommunications and the normal
telecommunications
time limit will take effect
(Section 5.1). The 21X
will not send any data
without
first receiving
a
command to
do
so.
TELCOM program in Campbell Scientific's
PC208 datalogger support software enables
PCIXT/AT/PS2 and compatible computers
to
automatically answer
calls and retrieve data.
When the
21X receives
a
correct digit for
the lD
it restarts the
4 second
timer. There
are
then
4
seconds
in
which
the next digit must
be
before the 21X again sends
the
lD.
When the
21X sends
the lD,
it
expects
the response to
start from
the
beginning.
lf
an incorrect
character is detected, the 21X
will immediately
send the
correct
lD.
lf
a
correct response is
not
received within the time allotted
in Parameter
3.
the 21X will hang
up.
Advertisement
Table of Contents
