VXI SM8000 user manual Address Register - Write Only

VXI Technology, Inc.

		Address Register – Write Only
ADDR	Plug-In LA+0x108
D15-D7	Unused
			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
D6-D0	Address Byte to		the VXI Bus, letting the SM8000 generate the default address that
			is used in the command string. This could possibly increase
	Optical Module
			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.

SM8000 Series Programming 53