Teltronics SEB NET-PATH, Installation And Operation Manual

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NET-PATH Installation and Operation Guide
Page 2-7
Wet Contact
Application
RS423A
You can option each sensor independently in order to support RS423A input levels.
There are two option straps per sensor that need to be moved, as shown in the NET-
PATH Contact Sensor Options Strap Locations, page 2-8. Once a sensor is strapped
for RS423A logic, it will no longer support dry contact input or wet input levels that
are described above. The attached sensor must provide -5.0 to -0.3 VDC for the active
state and +0.3 to +15.0 VDC for the inactive state. Values outside this range will
produce indeterminate results.
Figure 2-8 NET-PATH Input Sensor Optioned for RS423A
Figure 2-9 NET-PATH Input Sensor Circuitry for RS423A
Note
Ground is common for all sensors but individual
sensor grounds must be maintained to provide surge
protection for each sensor circuit.
CONTACT SENSOR INPUT CIRCUITRY
Optioned for RS423A Logic
L
L
600 OHMS @
100MHz
VR 22V
0.0047uF
4.7K
+5V
J
J
470
OHMS
1489
ADM5180
RJ45
2
1
3
2
1
3
Gnd
CONTACT SENSOR DETECTION THRESHOLD
FOR RS-423A LOGIC (ADM5180)
Logic 1
(Inactive Threshold)
+ 0.3 V to + 15.0 V
Logic 0
(Active Threshold)
- 0.3 V to - 15.0 V