Philips 6652C - Output Data

OUTPUT DATA
When the counter is an active "talker", the re-
sult of a measurement is transmitted to the con-
troller over the IEEE-488 Bus. The output data
from the counter can be of three different
kinds,
- Programming status
Status byte
Normal measurement values,
Programming status strings
Programming status strings are of two kinds and
consist either of a sequence of 8 strings with a
total of 133 ASCII characters plus delimiters or
an unreadable string of 43 ASCII-characters,
defining the present programming status of the
counter. They are sent out instead of a measure-
ment value when instructed to do so by program-
ming code "Pi!l" or "P1" (Program data . out). See
section "Programming Codes" for details.
Status byte
A status byte is a one byte message sent by the
PM 9696 interface logic as a response to a
serial poll. The status byte cant ains informa-
tion such· as:
Service requested by the counter?
Error condition?
Yes/No
Yes/No
Counter is busy or ready for new measurement
See
also section "Status Byte".
Normal measurement values
A normal measurement
result is sent from the
counter as a string of ASCII characters, in
accordance with the following format:
I rlrl ~P lxl xl xlx I xi x lx lxl x lx lxl El•l xl
0
1 (D) I
Bytes 1,2
Ff =Function code (see table 5.4).
Byte 3 Normally a space character. On
overflow, 0 is sent.
Bytes 4 •• 14 XXXXXXXXXXX means 11 characters
containing the measurement value.
10 characters are digits and one is
Byte 15
Byte 16
Byte 17
Byte 18
Byte 19
a floating decimal point.
E is an exponent pointer.
Exponent sign is + or -.
Exponent value X is either ~ or
multiples of ±3.
Delimiter CR, LF, ETX or ETB
Second delimiter LF (only if deli-
miter combination CRi'tF has been
selected).
Note: With negative values of math constants K
and/or L the result might be negative. In
this case a minus sign (
11
-
11
) is sent in-
stead of the last of the leading zeros,
Example: "fA 000-1234.56£+3"
Leading zero suppression
When leading zero suppression is enabled (LE1),
all leading zeros are removed from the output
string. The object is to increase the output
data transfer rate on the bus. The format is
then no longer fixed. The following output data
(without leading zero suppression):
will be reduced to:
with leading zero suppression.
Output of voltages and trigger levels
There are two except ions to the normal output
format.
When trigger levels (code Tl) or Vmax•
Vmin (code VM) are sent, the output format will
be:
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