
HOST COMMAND SET REFERENCE
UNILINK HOST
ADAPTER 5–4
USER MANUAL
The cycle at power
-up or reset is shown in Figure 5–2.
Configuration
Initiation
Operation
Performance
Termination
Figure 5–2 Command Usage Cycle
5.1.3 Secondary
Addr
esses
Secondary addresses are one byte in length and range from 1 to 254. The
addresses
0 and 255 are reserved for special functions as indicated in T
able
5–1.
Normally the address 255 is used as a shorthand method to indicate that the
command should be processed for all secondary devices on the network. Care
must
be
used with this shorthand method because a host command timeout may
occur
before the response has been gathered from all of the secondaries.
Your network will operate more efficiently if you number your secondary
devices
and HIUs beginning with address
“1” and consecutively numbering the
remaining
devices.