Grass Valley Performer SD - Manual (Page 103)

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Control Panel Reference
General Rules for TEN-20, 20-TEN Protocol
The ground rules under which 20–TEN protocol operates prevent
two switcher controllers (or control panels) from being placed on
the same level unless the two are controlling differently-
numbered destinations and/or levels. This restriction does not
apply to slave units. Likewise, no Performer may be on the same
bus as another unless they are assigned different level,
destination, and/or source offset. Using switch S1 on the
Performer to manipulate source, destination, and level
assignments in conjunction with the four 20-TEN protocol
variations, you can configure control panels and switchers to suit
many needs (Performers on the same bus can be set to different
protocol variations).
The following descriptions address:
■ Switch S1 settings on the Performer
■ TEN–20 Control Panel Switch Settings
■ TEN–20 Control Panel Rack Mounting and Cabling
Performer S1 Switch Settings
When one of the TEN–20 protocol variations is selected,
Performer switch S1’s function changes from address selection to
source, destination, and level offset selection. As described above,
these offsets in conjunction with the protocol variations allow
multiple Performers to be used on the same RS485 bus in many
ways.
Source Offset
Segments 1, 2, and 3 of switch S1 determine source offset. The
switches operate in binary fashion (1 most significant; 3 least) to
select source offsets from 0 to 7. When a source offset of 0 is
selected, Performer sources are numbered from 1 through 10. If a
source offset of 1 is selected, Performer sources are numbered
from 11 through 20. When a source offset of 2 is selected,
Performer sources are numbered 21 through 30. This sequence
continues through a source offset of 7 and sources numbered from
71 through 80.