Secure Care KinderGUARD ID, Installation Manual, Page: 21 / 96

Doc. No.: A05280692 Rev. AE ECO: 13200 Date: 11/04/2019
21
Cutband Receiver
1 2 3
4 5 6 7 8
ON
Secure Care Products, Inc
12v DC ONLY!
REV
P03290012 REV1
12v DC ONLY!
+
_
+
-
TP1
TP3
8 7 6 5 4 3 2 1
ON
GND HI LOW
1
2
3
4
5
6
7
LEGEND
1. Tunning Pot
2. 12VDC Power inputs
3. Connection for
flashing upgrades only
4. Signal LED
5. Dipswitches used for
addressing.
6. Can Bus connection
7. Communications
Termination Jumper
Figure 8-4 Cutband Receiver Layout
The Cutband Receivers are designed to detect the Cutband signal from the transmitters when the Cutband strap has been
cut or removed by an unauthorized person. The Cutband Receiver detects the 433.92 MHz signal and transmits its
unique ID # to the Cutband XIU. The receivers also detect the STAT (I’m alive) signal that the transmitter transmits
every 7.5 seconds letting the system know the transmitter is in the monitored zone.
Measuring In-Band Noise
Connect an oscilloscope to RSSI (TP2) of the cutband receiver. TP3 is the ground reference for all
measurements. Adjust the scope to acquire the signal of an active transmitter in range of the receiver. With the scope,
measure the maximum noise level present on RSSI.
Adjusting Receiver Sensitivity
Attach the scope or a digital volt meter to the threshold test point (TP1). Adjust variable resistor (RV1) to set the
receiver threshold level a minimum of 100 mV above the measured maximum noise level. Place a transmitter at the
maximum range and verify it can bee seen on the scope and that it exceeds the set threshold. Try several orientations of
the transmitter and verify all are detected by the receiver (all exceed the set threshold level). Identify the worst
orientation and measure this signal level with the scope. To reduce the likelihood of interference the threshold may be
raised to a level that is 100mV below the signal level measured in the step above.
Identification and elimination or suppression of potential interfering signals may be needed to ensure proper operation
of the Cutband system.
The Cutband system may function properly in the presence of some RF interference. If this interference exceeds the
receiver threshold settings the installer will have to verify that the receiver does not report any false transmitter ID’s
back to Secure Care Software.
Transmitter Battery Monitoring
The STAT transmitter actively monitors the status of its battery. When the transmitter battery is near the end of its
useful life (less than 2.7v) it will issue a low battery signal that will trigger an audible and visual alert at Secure Care
Software. A “Low Battery Alert” will be displayed on the computer. The transmitter should be replaced at this
time. Failure to replace a weak transmitter will compromise performance of the system.
SECTION 8 SYSTEM COMPONENT DESCRIPTIONS