Metrohm 877 Titrino plus - Manual (Page 121)

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10 Appendix
877 Titrino plus
￭￭￭￭￭￭￭￭ 111
Command Function Comment
$A Confirm message Confirm the message on the instrument
with [OK]
A mandatory status scan providing the
message number must take place immedi-
ately before confirming the message, see
above.
$A(OK), $A(CANCEL) Confirm message Confirm the message with [OK] or [Can-
cel]
$A(YES), $A(NO) Confirm message Confirm the message with [Yes] or [No]
$L(method name) Load method The method name has to be known and
unique.
$Q(variable) Request variable value Examples for variables: EP1, R1, C00.
Complete list of the variables, see page
22.
The values of the variables are only available after the end of a determina-
tion (in the status 'ready').
Acknowledgement of
the instrument Comment
OK Command executed
E1 Method not found
E2 Invalid variable
E3 Invalid command
10.8 Arithmetic algorithms in the 877 Titrino plus
Numerical format
The software of the 877 Titrino plus calculates in accordance with the
widespread standard IEEE 754 (IEEE Standard for Binary Floating-Point
Arithmetic for Microprocessor Systems). This means that the numbers are
used in calculations in "double precision" (64 bit). Decimal numbers are
converted into binary numbers in the computer and used in this form for
calculations. The output on the display and in reports once again contains
decimal numbers; the binary numbers are thus converted back into deci-
mal numbers. In order to be able to check the internal calculations per-
formed by the computer yourself in accordance with IEEE 754, the num-
bers are reproduced in the calculation report in complete accuracy. A min-