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52 SM8000 Series Programming
Command Register – Write Only
ADDR
Plug-In LA+0x106
D15-D12 Read Byte Count
This nibble holds the number of bytes that are to be read back
from the optical module. The value loaded into this nibble is
dependent on the command that is required to execute in the lower
byte of this register. See the Optical Attenuator Operation section
of the manual for the specific number of data bytes to be read back
for each command. The count range is 0 to 7 bytes.
The number of data bytes being read back, plus 1, must be loaded
into this nibble.
D11-D8 Write Byte Count
This nibble holds the number of bytes that are to be written to the
optical module. The value loaded into this nibble is dependent on
the command that is required to execute in the lower byte of this
register. See the Optical Attenuator Operation section of the
manual for the specific number of data bytes to be sent for each
command. The count range is 0 to 7 bytes.
The Address, the Command Register, and the number of data
bytes being sent must all be added together to calculate the
number that is loaded into this nibble.
I.e., The number of data bytes being sent, plus 2, must be loaded
into this nibble.
D7-D0
Command Byte to
Optical Module
This Command Byte is sent to the optical module being controlled.
See the Optical Attenuator Operation section of the manual for
specific definitions of all the defined commands.
This command byte must be set prior to writing to the optical
module’s data (attenuation level) register.
Note: See Command Register later in this section.