RJM ARTS-201B, User Manual

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SECTION 1 SECTION 1 SECTION 1 SECTION 1
ARTS ARTS ARTS ARTS----201B 201B 201B 201B
General description General description General description General description
The RJM ARTS-201B functions as an analog input transfer unit that can switch
between two sets of input signals, A and B, either automatically or manually,
using either a local or remote A/B switch. When operating in the automatic switch
mode, the switch is determined by the presence of video on the in-use video
input. If video goes away on the selected (in-use) input and video is present on
the non-selected input, then a switch to the non-selected input will occur. If no
video is present on the non-selected input then no switch will occur.
There are three types of signal inputs to the ARTS-201B for each of the A and B
inputs; analog video, analog audio and GPI. The video input terminates in 75
ohms and has a differential input to remove any common mode hum. There are
two 75 ohm BNC connectors for the video switch output. There are four channels
of balanced audio. Each audio input is passively looped to a second connector
for monitoring purposes. All balanced audio inputs are high impedance, greater
than 100K ohms. There is a single connector for each audio channel output.
There are five GPI lines, plus a dedicated line that indicates the A and B
receiver’s health. This line is sensed by the ARTS-201B and indicated on the
External Control connector.
The output of the ARTS-201B will be either the A or B inputs of video, audio and
GPI. During the transfer from one input to the other, all channels (video, audio
and GPI) switch together. The video switch is not vertical interval.
Some of the other features of the ARTS-201B include:
•
When the unit is in the automatic mode, if the signal fails on the A input
the unit switches to the B input. A jumper is provided on the module to
allow the user to define whether the unit returns to the A input upon return
of the A signal or that the unit remains on the B input until it is manually
returned to the A input. The return-to-A-signal mode can be delayed by an
adjustment to allow from 1 to 5 seconds after return of A signal before the
unit switches back to the A input. Default mode is remain-on-B.
•
Relays are provided for both the video and audio signal inputs that will
allow the A input signal to be re-routed to the #1 output, bypassing the
changeover function, upon loss of power to the changeover unit.
•
Video monitor outputs for A and B inputs. These monitor outputs are post-
gain so that they represent the true video input of the A/B switch.