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32
6 – LOGIC FUNCTIONS
The rear connector CN3 provides 3 user programmable opto-coupled inputs that can be operated from external contacts
or logic levels supplied by an electronic system. Three different functions may be added to the functions available from
the front-panel keys. Each function is associated to one pin (PIN 2, PIN 3, PIN 4) and is activated by applying a falling
edge or a low level pulse to the corresponding pin with respect to common (PIN 1).
Each pin can be assigned one of the 13 functions listed on the following pages.
•
Factory configuration
Functions associated to Connector CN3 in factory configuration are: OFFSET, RESET and RESET TOTALIZER.
CN3: FACTORY CONFIGURATION
PIN (INPUT)
Function
Number
PIN 1
COMMON
PIN 2 (INP-1)
OFFSET
Function nº 1
PIN 3 (INP-2)
RESET
Function nº 2
PIN 4 (INP-3)
RESET TOTALIZER
Function nº 6
Logic functions diagram
1 2 3 4
1 2 3 4
CN3
1 2 3 4
The external electronics applied to the CN3 connector must
be capable of withstanding 40 V and 20 mA present at all
terminals with respect to COMMON. In order to guarantee
the electromagnetic compatibility, please refer to the
instructions given on page 9.
32
6 – LOGIC FUNCTIONS
The rear connector CN3 provides 3 user programmable opto-coupled inputs that can be operated from external contacts
or logic levels supplied by an electronic system. Three different functions may be added to the functions available from
the front-panel keys. Each function is associated to one pin (PIN 2, PIN 3, PIN 4) and is activated by applying a falling
edge or a low level pulse to the corresponding pin with respect to common (PIN 1).
Each pin can be assigned one of the 13 functions listed on the following pages.
•
Factory configuration
Functions associated to Connector CN3 in factory configuration are: OFFSET, RESET and RESET TOTALIZER.
CN3: FACTORY CONFIGURATION
PIN (INPUT)
Function
Number
PIN 1
COMMON
PIN 2 (INP-1)
OFFSET
Function nº 1
PIN 3 (INP-2)
RESET
Function nº 2
PIN 4 (INP-3)
RESET TOTALIZER
Function nº 6
Logic functions diagram
1 2 3 4
1 2 3 4
CN3
1 2 3 4
The external electronics applied to the CN3 connector must
be capable of withstanding 40 V and 20 mA present at all
terminals with respect to COMMON. In order to guarantee
the electromagnetic compatibility, please refer to the
instructions given on page 9.