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5.2 – Connector functions
The connector CN3 provides 3 opto coupled inputs that can be
operated from logic levels supplied by an external electronic
system. Three different functions may then be added to the
functions available from the front panel keys. Each function is
allocated to a pin (PIN 2, PIN 3, PIN 4) that is activated by applying
a low level to each one with respect to PIN 1 or COMMON. The
allocation is achieved through the programming of a number
between 0 and 15 corresponding to one of the functions listed in
the following table.
•
Factory configuration
As shipped from the factory, the CN3 connector allows the TARE;
RESET TARE functions operated from the front-panel keyboard and
moreover incorporates the HOLD function.
When a HOLD is made, the display value remains frozen while the
corresponding pin is activated. The HOLD state, affects neither the
instruments internal operation nor the analog and setpoint outputs.
CN3: FACTORY CONFIGURATION
PIN (INPUT)
Function
Number
PIN 1
COMMON
PIN 2 (INP-1)
TARE
Function nº 1
PIN 3 (INP-2)
RESET TARE
Function nº 2
PIN 4 (INP-3)
HOLD
Function nº 6
The external electronics applied to the CN3 connector inputs must
be capable of withstanding a potential of 40 V/ 20 mA present at all
terminals with respect to COMMON. In order to guarantee the
electromagnetic compatibility please refer to the connection
instructions given on (Sec. 2).
