When the "TARE" logic input terminal is disconnected (i.e., at the "Logic 0" level),
pressing the TARE/RESET button once will instantly bring the displayed data
reading to the value currently contained in the 3500 instrument's TARE REGIS-
TER. From this point, the displayed data will continue to track the "live" input, but
now with the continuous application of the constant TARE OFFSET determined
by the difference between the reading that existed when the button was first
pressed and the last-entered TARE-REGISTER value (see Fig. 24, Section 5.c).
1
The button will remain lit as long as the displayed data represents a "tared" read-
ing. Pressing the button a second time will reset the data display to the normal
"untared" reading.
When the "TARE" logic input terminal is connected to GROUND (i.e., at the "Logic
1" level), the TARE/RESET button is DISABLED.
2
When the "PRINT" logic input terminal is disconnected (i.e., at the "Logic 0" level)
AND the PRN=ON [CMT] command is in effect, pressing the PRINT button once
will initiate the transmission of formatted hard-copy output from the RS-232/485
Interface Port according to the time interval specified by the user (see Section
3.a.10).
3
The button will light only when a print transmission is actually occurring
and the instrument updates the LCD display during that time. Pressing the but-
ton a second time will halt any print transmission in progress at the end of the
line currently being sent.
4
E.2
E
RUN-TIME BUTTON FUNCTIONS
RUN-TIME BUTTON FUNCTIONS
TARE
RESET
PRINT
1
The operator can load the TARE REGISTER via the TARE/RESET button in SETUP MODE, or
via the TARE REGISTER (TRR) command. Note also that when the "TARE" logic input terminal
is at "Logic 0," a command of TAR=ON [CMT] applied via the RS-232/485 Interface Port has
the same effect as pressing the TARE/RESET button the first time, while TAR=OFF [CMT] has
the same effect as pressing the button the second time (see Section 5.c for the use of these
commands).
2
Changing the logic level of the "TARE" logic input terminal from "Logic 0" to "Logic 1" has the
same effect as pressing the TARE/RESET button the first time (i.e., it tares the "live" data read-
ing), while changing the "TARE" logic input terminal from "Logic 1" to "Logic 0" has the same
effect as pressing the button the second time (i.e., it resets the unit to untared data display). A
Logic 1 level at Logic Input 5 also disables the TAR=ON [CMT] and TAR=OFF [CMT] mnemon-
ic commands as well as the TARE/RESET button (see Section 5.c).
3
Assuming, that is, that the 3500 instrument's NODE NUMBER is currently "0." If the NODE
NUMBER is not "0," the instrument will not produce hard-copy output. Note too that the
PRN=ON [CMT] command is automatically in effect on every instrument powerup.
4
Changing the logic level of the "PRINT" logic input terminal from "Logic 0" to "Logic 1" when
PRN=ON [CMT] has the same effect as pressing the PRINT button the first time (i.e., it initiates
hard-copy printout). However, it also disables the PRINT button, which cannot now be used to
stop the printout. The only way to halt printing is to issue to the 3500 instrument a command of
PRN=OFF [CMT] or to change the "PRINT" logic input terminal from "Logic 1" to "Logic 0"
when PRN=ON [CMT]. See Section 5.d for a full discussion of the PRINT ENABLE (PRN)
command.
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