Instrument Connection; Measuring Ranges; Termination Of Rs 485 Communication Line - Orbit Merret OM 502 User Manual

3. INSTRUMENT CONNECTION

The instrument supply leads should not be in proximity of the incoming low-potential signals.
Contactors, motors with larger input power should not be in proximity of the instrument.
The leads into the instrument input (measured quantity) should be in sufficient distance from all power leads and appliances.
Provided this cannot be secured it is necessary to use shielded leads with connection to ground (bracket E).
The instruments are tested in compliance with standards for use in industrial area, yet we recommend to abide by the above
mentioned principles.

MEASURING RANGES

TYPE
DC
PM
I
LX
DU
T

Termination of RS 485 communication line

X3 - Termination of commuication line RS 485
Full Significance
1-2 connect L+ to (+) source
3-4 termination of line 120 Ohm
5-6 connect L- to (-) source
RS 485 line should have a linear structure - wires (ideally shielded and twisted)
should lead from one device to another.
6 | INSTRUCTIONS FOR USE OM 502
INPUTS I
±999,99 µA; ±9,9999 mA; ±99,999 mA;
±999,99 mA; ±5,0000 A
0...5/20 mA/4...20 mA
0...5/20 mA/4...20 mA
0...5/20 mA/4...20 mA
Linear potentiometer (min. 500 Ω)
1...4 / 2...8 / 4...16 mV/V
Default Recomendation
terminalconnected
disconnected connect at the end of line
terminalconnected do not disconnect
INPUTS U
±999,99 mV; ±999,99 mV; ±9,9999 V;
±99,999 V; ±300,00 V
±2/±5/±10 V
±2/±5/±10 V
±2/±5/±10 V
1 3 5
X3