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Instruction Manual MM850099 ed.02a
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Switch the instrument -OFF- and then -ON- again; if the indication persists the instrument requires a
new calibration.
If the fault indication persists after the calibration procedure contact our technical staff for hardware
service.
! ! ! Er r o r 9 ! ! !
Indicates a not verified data writing on the EEPROM memory
Un d e r
Indicates "underflow" conditions
Ov e r
Indicates "overflow" conditions
Er r 6
Indicates that the external load exceeds the acceptable and
stated limits or that the external circuit is open.
8.7
Digital interface
The
UniCal V
portable calibrator is equipped with a digital interface.
The interface circuit is essentially based on the serial communication interface subsystem ( SCI ) on the
chip of the microprocessor.
The output voltage levels are TTL at 0 to +5 V.
An optional adaptor to convert the voltage level from 0 to +5 V to true RS232 levels can be supplied on
request,
This adaptor is required to interface the
UniCal V
with a Personal Computer.
8.7.1
Digital interface program mode
•
To enter the procedure, press the <
ON
> + <
ENTER
> keys; the display will be as in fig. 8.7.1.A.
CAL 3 0 3 9 8 Z mA
Fig. 8.7.1A
•
To enter the program mode press the <
2
> key; the numerical value of the "baud rate" can be one of
the following (see fig. 8.7.1.B):
BAUD RATE 9 6 0 0
Fig. 8.7.1B
•
Select, through the <
UP
> or <
DOWN
> keys the "baud rate" used by the receiver unit and
transmission lines (permitted values are : 9600, 4800, 2400, 1200, 600, 300).
•
Load the value in the memory by pressing the <
2
> key; the display will indicate as in fig. 8.7.1.C,
and represents the identification code of the instrument.