Metro DataVac M1, User Manual, Page: 85 / 94

M1 – M3 Display units
Page 85
The MB-RL has two independent and isolated relays indicating the position of the
displayed measurement by comparison with the tolerances. Each relay provides a
contact that is normally open in case the measurement is within the tolerances (MINNO
and MAXNO) and a contact that is normally closed (MINNC and MAXNC). The
commons of each relay (MINCOM and MAXCOM) are independent, so that the user is
as free as possible.
MINCOM
MINNC
MINNO
MAXCOM
MAXNC
MAXNO
RELAIS TOLERANCE MINI RELAIS TOLERANCE MAXI
Four inputs isolated by opto-couplers enable to operate the M3 by remote control. They
are active at the logical level 1 (+12 to + 24 Volts) that must be maintained at 1 for 50
milliseconds minimum. The command is effective when the input comes back to zero,
except for the input STOP that stays active as long as the logical level 1 (+12 to + 24
Volts) is maintained.

INITDYN : This input controls the initialisation of memories for the dynamic
measurement. It must be used every time the dynamic measurement starts, when the
part to be measured is already in place under the probes. This command has the
same function as the button “CLEAR” of the measuring screen.

STOP : This input stops the measurement (and freezes the screen) as long as it is
maintained at the logical level 1.

ZERO : This input controls the zero reset of the display. The display then indicates
the variations of the measurement in comparison with this origin. This command has
the same function as the button “ZERO” of the measuring screen

PRINT : This input controls the sending onto the communication port of the displayed
measured value. This command has the same function as the button “PRINT” of the
measuring screen

PRESET : External command of calibration according the selected working mode. This
command has the same function as the button “PRESET” of the measuring screen
SUB D connector (15 pins) : pin assignment
Borne Signal Sens Description
1 +5 V output Power supply to activate the inputs
2 Not
connected
3 MINNC - Mini tolerance relay contact 1A 48V
4 MINCOM - Common of mini tolerance contacts