Seametrics iMAG-Series - Manual (Page 14)

INPUTS/OUTPUTS and OPERATION
Open
Collector
Transistor Power
Source
V s =3-36Vdc
V Out
47k Ω
Pull-down
Resistor
Green*
White*
V s
0
V Out
Meter Cable User Equipment
Current Sourcing Pulse
Waveform
_
+
_
+
_
+
_
+
іout
R
in
Digital Output Application - Sourcing Mode (Recommended for R
in
< 30kΩ)
Open
Collector
Transistor
Power
Source
V s =3-36Vdc
Pull-up
Resistor** V s
0
V Out
Meter Cable User Equipment
Current Sinking Pulse
Waveform
V Out
_
+
_
+
_
+
Green*
White*
іout
_
+
R
in
Digital Output Application - Sinking Mode (Recommended for R
in
> 30kΩ)
Orange*
Blue *
Power
Source
V s =6-36Vdc
R
L
***
_
+
4-20mA
Current Output***
Analog
Output
_
+ _
+
_
+
іLoop
Meter Cable User Equipment
Analog (4-20mA Current Loop) Output Application
* Wire colors shown are typical but because there are exceptions, always refer to the color codes shown on the cable label
or “Control Cable Wiring” table on page 11.
** Minimum resistor value is (100 x V s ) ohms. Higher resistances maybe used depending on frequency and cable length.
Longer cables and high frequencies require lower resistance.
*** Resistor R
L
converts 4-20mA current to voltage for voltage input only devices.
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