Operating instructions

Page 22 RF Technology R350/R500

7 SPECIFICATIONS 7.4.20 Carrier Operated Switch Output

7.4.19 Channel Select Input/Output

Coding:

8 lines BCD coded 00-99

Logic Input Levels:

0 = <0.4 Volts

1 = >3.5 Volts

Internal 10K pull down resistors selects Channel 00 when all inputs are O/C.

7.4.20 Carrier Operated Switch Output

Floating Opto-Coupler Output:

The carrier operated switch output is via an opto-coupler. Collector and emitter

connections are available to allow connection for source or sink.

The opto-coupler can be linked inside the receiver to be ON when a carrier is

detected or to be ON in the absence of carrier.

Connection to Remote Switch via 600Ω Line:

Internal connections are provided so that the opto-coupler can be connected to the

600Ω line for use over a single pair. This permits remote switching with no extra

connections.

Current Source/Sink, Collector Voltage:

The COS output is implemented with an optocoupler whose ratings are:

Ic = 10mA or 20mA Maximum

Vc = 30 Volts 15 V Maximum

7.4.21 CTCSS

The CTCSS decoding is provided by a hybrid module. This provides programmable

decoding of all 38 EIA and 12 other common tones. Refer to table 4.