Videotec SM42A, Руководство по эксплуатации

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Pag. 16 SM42A / SM82A 2802
4.3.1.2 DCJ Keyboard
The DCJ keyboard is able to control both telemetry receivers and video multiplexers. Because the DCJ keyboard is
so flexible, it should be configured very carefully, following the instructions in its user’s manual. At the keyboard
level, configure the video line for the MACRO protocol.
4.3.2 Controlling a video multiplexer
It is possible to control three multiplexer models:
•
Videotec
•
Javelin/Hitron in colour
•
Javelin/Hitron in black and white
After setting the AUX line for the matrix, depending on the type of multiplexer used (see OSM programming for the
AUX line, section 5.3.1.2), the matrix will take care of converting the messages destined for the AUX line into the
appropriate protocol. See the keyboard and multiplexer manuals for instructions on using these devices.
4.3.3 Controlling the telemetry receivers
4.3.3.1 Protocol instructions
Both the control keyboards and the SM42A / SM82A matrix should be configured in MACRO mode: when the
receivers use the VIDEOTEC protocol the matrix will take care of translating the commands. It is not possible to
control receivers or domes that do not use the VIDEOTEC and MACRO protocols.
4.3.3.2 Useable keyboards
It is possible to use the DCTEL model (configured with the MACRO protocol on the video line) and the DCJ model
(configured with telemetry on the video line and the MACRO protocol).
4.4 Telemetry transmission on the coaxial cable
The SM42A / SM82A matrix is able to transmit telemetry data (pan & tilt and camera lens control) directly along the
coaxial cable to those receivers that are set up for this type of connection (such as DTRX3 equipped with the
DTCOAX board for example). A normal coaxial cable of the RG59 type (or equivalent) is able to cover a maximum
distance of 350 metres (between matrix and receiver).
Between the input video of the matrix using transmission via coaxial cable and the video connector on the
receiver being controlled, there should be no active amplification device (such as video distributors or other
matrix/switcher models). We therefore strongly recommend a direct connection of the type: input video matrix
/coaxial cable/ telemetry receiver over coaxial cable (see the diagram for the Example of Installation in section 3.2).
Each input video identifies one and only one receiver address to which it is to be connected. Therefore the
coaxial telemetry receiver connected to input video n°1 of the matrix, should have the address n°1, the receiver
connected to input video n°2 should have the address 2 and so on. It is not possible to connect more than one
receiver in cascade using the same coaxial cable: for each input video it is possible to connect only one telemetry
receiver over coaxial cable. It is therefore possible to connect a maximum of 8 telemetry receivers over coaxial
cable (one for each input video) in the case of the SM82A matrix (4 in the case of SM42A).
After setting up the connections, the matrix must be enabled for transmission over coaxial cable. Therefore enter
on-screen programming mode and follow the instructions (see the on-screen programming menu under the item
COAX Transmission and AUX Line, see section 5.3.1.2).