27
Magtrol AN 2000 C
Instruction Manual
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Default configuration
As shipped from the factory, the CN2 connector allows the
TARE, MAX/MIN and RESET operations be made in the same
way as from the front-panel keyboard and incorporates one
more function: the display HOLD.
The HOLD state, which is acknowledged by the LED "HOLD",
freezes the display, the BCD and the analog outputs but does
not halt the meter's internal operation nor the alarm outputs.
The HOLD state is maintained as long as pin2 is kept to a low
level with respect to pin 3.
CN2 : DEFAULT CONFIGURATION
PIN (INPUT)
Function
Number
PIN 1 (INP-1)
RESET
Function nº 7
PIN 2 (INP-2)
HOLD
Function nº 9
PIN 3
COMMON
PIN 4 (INP-4)
TARE
Function nº 1
PIN 5 (INP-5)
PEAK/VALLEY
Function nº 6
The external electronics applied to the CN2 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 10.
3.2 - Remote functions (CN2)
The rear connector CN2 provides 4 user programmable optocoupled inputs that can be operated from external contacts or
logic levels supplied by an electronic system. Four different functions may be then added to the functions available from the
front-panel keys. Each function is associated to one of the CN2 connector pins (PIN 1, PIN 2, PIN 4 and PIN 5) and is
activated by applying a falling edge or a low level pulse to the corresponding pin with respect to common (PIN 3).
Each pin can be assigned one of the 36 functions listed on the following pages.
Fig. 27.1
Logic Change
CN2
3 2 1 J1
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6 5 4 J2
CN2 Input
PNP
J1 (2-3) y J2 (5-6)
NPN
J1 (1-2) y J2 (4-5)
Fig.. 28.2 Examples of
connexion. PNP, NPN or
contact closure