Panasonic KX-TDA600 Installation Manual page 184

2.8 Information about the Other Cards
External Sensor
Power to the external sensor is provided from the EIO4 card and must be grounded through the EIO4 card
as indicated in the diagram below. A pair of "sensor" and "common" lines are connected to the EIO4 card
for each external sensor. The Hybrid IP-PBX detects input from the sensor when the signal is under 100 Ω.
Connection Diagram
Hybrid IP-PBX
OPB3
EIO4
+5V
10K
I/O
4.7K
External Relay
Current Limit: 24 V DC/30 V AC, 1 A maximum
184 Installation Manual
+5V
33
33
4.7K
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sensor
common
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External Sensor