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VXI Technology, Inc.
SM8000 Series Programming 59
Note
To operate the modules correctly, the SM8000 must be loaded with a valid Address in the Address
Register. The SM8000 is hard coded at the factory with the optical modules default address of
73 => 49h, and may be used to generate the address used in the command. This is the address of all
attenuators as shipped from the factory. During the programming of the optical module, the
programmer may wish to omit sending the module’s address over the VXI Bus, letting the SM8000
generate the default address that is used in the command string. This could possibly increase
throughput, by decreasing VXI Bus traffic, if the modules are receiving many commands, although this
is only true if the optical module’s address is not changed by the user. If the address is to be changed,
IT IS IMPERATIVE THAT THE NEW ADDRESS BE WRITTEN DOWN. Failure to do so will result
in an inability to control the module. All four possible modules may have the same address. The
SM8000 controls them on separate internal busses.
VTI STRONGLY RECOMMENDS THAT THE OPTICAL MODULE’S ADDRESS BE LEFT AT 49h.