Table of Contents
Advertisement
3.11.14 Data Output in Compacted
Binary Format
The compacted binary format for data output can be
selected to save time. Selection must be made via
IEEE-488 bus, not via the keyboard. The time saving
is indicated by the fact that this format conveys a full
set of test results in 8 binary bytes, compared to 44
binary bytes required by the regular format. Fewer
characters are sent if you select less than complete
results (such as bin number only, output only for
FAIL, etc).
The data stream for one measurement consists of
two to eight 8-bit bytes, depending on what output is
programmed. The format is explained partly in truth
Table 3-28, and partly in the text that follows.
The RLC,e byte (except for bit 7) conveys the RLC exponent (2s complement).
The RLC,mantissa bytes (all 16 bits) convey the RLC mantissa (base 2).
The QDR,e byte (except for bit 7) conveys the QDR exponent (2s complement).
The QDR,mantissa bytes (3.1116 bits) convey the O..DR mantissa (base 2).
(sign)(2^
The binary exponent and mantissa define a binary floating-point number, as follows:
Operation
)*(mantissa)
(exponent)
NOTE: The 8 bits in each byte are 76543210, where 0
is LSB (least significant bit). The vertical line or space
between bytes is for clarity only, not present in data.
The full eight bytes are sent only if RLC, QDR,
and Bin information is needed (i.e., only if status"
bits 2,1,0 are logic 111. Otherwise, the data word is
shortened, as follows.
If QDR data are NOT needed, the data format uses
5 bytes as follows.
If both QDR and BIN data are not needed, the
"OTHER" byte is omitted.
1693 RLC Digibridge
97
Advertisement
Table of Contents
