tbs electronics 2D IRON - Tamper Switch

TBS Installation Manual – 2D IRON & 3D AIR
TBS 2D IRON 3D AIR Mounting and Installation Guideline • TBS-056-057 • Rev 09-2023 page 16 of 21
Serial Interface RS485
Please connect from TBS device RS485 port directly to controller:
Label on TBS Terminal
Name
Type
Voltage Level
D-
Data -
In/Out
0V-5V Bias (±7 V Offset)
D+
Data +
In/Out
0V-5V Bias (±7 V Offset)
G
Ground
For farthest terminal, a 120-Ohm resistor termination may be added outside the terminal between D+
and D-.
5.8 Tamper Switch
The tamper switch is activated when the front panel is separated from the back panel. When the tamper
switch is activated, it closes like a relay.
Label on TBS Terminal
Name
Power Rating
Function
NO
Normally Open
Closes when the tamper switch
is activated
C
Common
30 VDC, 1A
220 VDC, 0.14 A
120 VDC, 0.25 A
250 VAC, 0.12 A
NC
Normally Closed
Opens when the tamper switch
is activated
A recommended way of utilizing the tamper switch is shown in the image below. As long as the front
and back panels are connected, the tamper switch relay connects C (common) to NO (normally open).
An alarm device is connected to a power line (e.g. 5 V DC) going through the tamper switch. As long
as it senses the power, no tampering has been taken place. Should the front panel be removed, the
tamper switch closes, and the 12 V line is broken, thus engaging the alarm. With this setup, the alarm is
also engaged when the terminal is cut from power entirely.
External
Alarm Sensing
Device
TBS Terminal Back
(with Tamper Switch)
TBS Terminal
Device Front
NC
COM
NO
Tamper
Switch
5V connection
sensing
12V connection
sensing