496371 Issue 1 5 of 20
Inputs
Radio
The 4618-50 and 4618-60 contain a standard Scantronic radio receiver which
connects to a BNC aerial socket mounted on top of the case.
Each detector sends information to the receiver using an attached radio
transmitter. The transmitter relays the information in the form of radio data
packets, using an FM signal. The signal contains a code identifying the
transmitter and information on the state of the detector. Every receiver within
range picks up the transmitter’s information, but reacts only to those transmit-
ters it has been programmed to notice.
Mode Switches
The Mode Switches are the controls that tell the system which transmitters to
notice, and what to do with the information received. Figure 2 shows the
location of the Mode Switches on the main circuit card in the lid.
Tamper
The 46RX family contain an internally mounted tamper switch to detect
opening of the case lid (see Figure 2). The switch gives a normally closed
loop isolated from any circuits on the main circuit card. This output can be
used as required. The switch contact opens when the lid opens.
Jamming
The 46RX family can detect radio jamming if Mode Switch 3 is ON. The
cause of jamming may be interference from nearby equipment, or the re-
ceiver detecting the radio carrier continuously. See “Fault Finding” for more
information.
Reset
The 46RX family have a Reset button on the front control panel. Pressing
Reset clears all the output channels and LEDs.
If you have an expanded system with two or more members of the 46RX
family connected together, then:
• Pressing Reset on the 4618-50/60 will reset only the 4618-50/60, and
not any attached 4619-50s.
• Pressing Reset on an attached 4619-50 will reset that unit, but not any
of the other units connected to it.
Each member of the 46RX family also has a connector for an external reset
signal (see Figure 2). By applying 12VDC to the positive terminal of the reset
connector and then removing it you can reset a system of connected 46RX
family units.
4618 Inputs
