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SM8000 Series Programming 53
Address Register – Write Only
ADDR
Plug-In LA+0x108
D15-D7 Unused
D6-D0
Address Byte to
Optical Module
This Address Byte is sent to the optical module being addressed.
See the Optical Attenuator Operation section of the manual for the
operation of the Address register.
To operate the modules correctly, the SM8000 must be loaded
with a valid Address in the Address Register. The SM8000 is hard
coded with the optical modules default address of 73 => 49h and
may be used to generate the address required in the command
string. 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. It is
recommended that the optical module’s address be left at 49h. 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 4 possible modules
may have the same address. The SM8000 controls them on
separate internal busses.
If setting the module’s address, the address byte must be set prior
to writing to the optical module’s data (attenuation level) register.