Installation
Page 2-6
Dry Contact
Applications
Dry contact applications are supported by optioning the sensor for RS232C logic
(factory default). The NET-PATH contact sensor circuit provides approximately one
milliampere of current when shorted. The user-supplied, physical sensors must
provide a dry-contact mechanical closure, such as a relay contact, or the solid state
equivalent. In dry-contact applications the external loop resistance must be 800 ohm
or less to be considered active (closed) and 15k ohm or higher to be considered
inactive (open). These values assume worst-case tolerances. Logical states include
“active” and “inactive” and though database options, may be considered the “alarm”
or “no-alarm” state, depending on the application requirements.
Wet Contact
Application
RS232C
Wet contact applications (such as TTL voltage levels) are supported by optioning the
sensor for RS232C logic (factory default). Be sure to observe input polarity or
damage to the external device may occur. The attached sensor must provide -15.0 to
+.70 VDC for the active state and +2.3 to +15.0 VDC for the inactive state. These
values assume worst-case tolerances.
Figure 2-6 NET-PATH Input Sensor Optioned for RS232C
Figure 2-7 NET-PATH Input Sensor Circuitry for RS232C
Caution This sensor circuit is designed for lower voltage
applications. The input voltage is limited to 22 VDC maximum.
CONTACT SENSOR INPUT CIRCUITRY
Optioned for RS232C Logic
L
L
600 OHMS @
100MHz
VR 22V
0. 0047uF
4.7K
+5V
J
J
470
OHM S
1489
ADM5180
RJ45
2
1
3
2
1
3
Gnd
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