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7.6
RD105/105B Subrack Controller Module
Every subrack must have one RD105 (except the HMX32128 which requires a HMX128),
and every subrack requires an RS-232 port on the MAXPRO-Net Server or MX18. The
RD105 subrack control module is a slave microprocessor controller developed to
oversee the operation of an individual MAXPRO subrack (both video switching and I/O
types). It decodes all MAX protocol commands directed to the various modules located
in the subrack and performs the actual communication with the individual modules.
Video switching source selection, text insertions update, output control and alarm input
detection and set-up, are just some of the control tasks of the RD105 module. As it
plays an integral part of all system operations, the RD105 module would have to be
classed as the most important module in the MAXPRO-Net Crosspoint Matrix Video
Switching System.
Operation
The RD105 subrack control module is located in a specially allocated 'SCM' slot or slot
'0' of a MAXPRO subrack. Only one (1) RD105 module can be installed into a subrack,
and only into the 'SCM' slot position (top left slot). NEVER plug a RD105 module into
any other slot position as damage may occur.
The RD105 module communicates with the MAXPRO-Net Server through a full duplex
RS-232 asynchronous serial line. There is a separate RS-232 communication line for
each subrack in the system. Although the data content from the MAXPRO-Net Server to
subrack is generally the same for all subracks, an identity number is included into each
MAX protocol command to direct the command string to the required subrack. As each
RD105 module (i.e. each subrack) in a system application has its own unique identity
code number, the MAX protocol commands will only be accepted by the correct RD105
module.
Rev. C
7.6-1
HMXMU001018
10/06
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