Videotec SM82A - Manual (Page 61)

Page 23 MNVCSM42A_0408
4.7 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 (DTRX3 equipped with the
DTCOAX or a DTMRX2). 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).