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N u m b e r
Error/Possible Cause
M o d e l
DRC-91C/93C
M o d e l
8223 RS-232C
Interface
T a b l e s
4-11
and
4-12
give
the
case it would need t o see another
Program
Curve
Summary.
T h e XDT,
Output Statement
command.
I f the
XDA and
XDN1N2
commands are Output
error was
in
the
"3", the
i n t e r f a c e
Statement
s t y l e
commands
which
may o r may not have responded w i t h
r e s u l t
i n
a
response
from
the
W 3
data,
it may d e f a u l t t o
wo.
interface.
The
balance
of
the
Although e r r o r s r a r e l y occur, it is
commands are Programing
Code
s t y l e
suggested that any commands s e n t t o
commands
which do
not r e s u l t in a
the
91C/93C
be
echoed
back
by
response from the i n t e r f a c e .
C a r e
s e n d i n g
t h e
appropriate
Output
must
be
taken
w i t h
the
XCN1N2
Statement command and inputting the
command not t o overrun the
256
stored parameters.
Any e r r o r t h a t
c h a r a c t e r
b u f f e r
of
the
8223
is
detected is cleared following
i n t e r f a c e .
As
i n
t h e
IEEE
the first transmission after the
operation,
i f
a hardware problem is
error,
detected
in
modifying one
of the
memory locations,
an
ERR01
e r r o r
w i l l be displayed i n the Display
Table 8223-6.
Interface Error Codes
and instrument operation w i l l be
h a l t e d .
C o n s u l t
a
f a c t o r y
r e p r e s e n t a t i v e
i f
t h i s
e r r o r
There
are three errors that could
be detected by the
8223
i n t e r f a c e
a s
d e f i n e d
i n
Table
8223-6.
Detection
of
an error does not
e f f e c t
t h e
o p e r a t i o n
of
t h e
i n t e r f a c e .
The
software
t h a t
i n t e r p r e t s the data tries t o match
the character input t o the possible
command i n p u t s and processes the
command.
T h e
e r r o r
is
a l s o
transmitted by
the
i n t e r f a c e the
next
time
it
is
asked
f o r
a
response,
T h e
error is transmitted
i n addition t o the Output Statement
data
output.
For
example,
i f
a
framing e r r o r w e r e
detected
i n a
command s t r i n g transmitted t o a
DRC-91C/93C
as
:
occurs.
P5
OW3
the interface might respond w i t h :
E r r 1 2
50.,25.,20.,2,047(CR)
(LF)
I f
the error w e r e detected
in the
8223.7
INTERFACING
EXAMPLES
transmission
of the
"P",
the
gain
change would
be
ignored;
i f
it was
Example
1.
HP-86B
Computer,
H a l f
i n the
"50",
one or two numerics
Duplex Without Handshake.
may have been generated.
I f
the
e r r o r w e r e
detected
i n
t h e "W", the
interface may not respond, i n which
COPYRIGHT 12/87
LSCI
8223-5
E r r 1 0
E r r 1 1
E r r 1 2
E r r 1 3
P a r i t y Error
-
may
be
caused by s i g n a l l i n e
transients o r i n c o r r e c t l y
specified p a r i t y .
Overrun Error
-
caused
by
the
main processor
not reading
the
input
character before the next
one becomes available.
T h e
overrun character
(s)
are l o s t .
Framing
E r r o r
-
may be
caused by s i g n a l l i n e
t r a n s i e n t s or i n c o r r e c t l y
specified s t o p
b i t s
o r
or character length.
Input
Buffer
Overrun
-
caused by more than
256
characters being input
input t o t h e
FIFO
buffer.
Any characters received
after the
256th
character
are l o s t .
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