VXI SM8000 - Manual (Page 70)

VXI Technology, Inc.
70 SM8000 Series Programming
90h
Command Name Set Address
Command Format 90h HIGH_BYTE
Description The Set Address command permanently sets the address to a one-byte (8-bit) value
between 0 and 127 (the MSB of HIGH_BYTE must be zero).
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.
Example The following example translates an integer decimal address value into a
HIGH_BYTE format:
1. 73 = 49h Convert to hexadecimal.
Note