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Command rates and message response time. |
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|  MIL-D-70789A (AR)
(13)
EXPANDED STATUS DATA (30.4.13)
(14)
SURVEY QUALITY (30.4.14)
VEHICLE BORESIGHT (30.4.15)
(15)
(16)
GEODETIC DATA (30.4.16)
3.5.4.4.3.4
Command rates and message response time. The
DRU shall accept and process commands received on both data
busses simultaneously at the rates and response times listed in
Table IV. The two combinations of commands that are required to
(1) 5 HZ commands received on
be processed simultaneously are:
both busses; (2) a 5 HZ command received on one bus and a 100 HZ
command received on the other bus. The response times are
measured beginning with transmission of the first bit of the
command by the prime system and ending with receipt of the last
The DRU is not required
bit of the message by the prime system.
to accept a new command on a particular bus until the message
associated with a command previously received on that bus has
been transmitted or until the required response time for the
command previously received plus 10 milliseconds has elapsed with
STATUS S2/1 shall be set within 1 second
no message being sent.
after receipt of a command that triggers any one of the following
D2/0, D2/2, D3/5, D3/6, D3/7, D4/0, D4/1, D4/3, D4/4,
ALERTS:
STATUS S2/1 shall be set in the message responding.
D4/6, D4/7.
to a command which triggers any of the following ALERTS: D5/0,
D5/1, D5/2, D5/5, D5/6, and D5/7. A STATUS DATA message shall be
sent in response to any command which triggers a D5/0 or D5/1
ALERT. A change in STATUS triggered by receipt of a command
shall be reported in the message returned in response to that
command for the following STATUS bits: S1/0, S1/1, S1/5, S2/2,
S2/4, S/6, S3/4, S4/0, and S4/1.
3.5.4.4.3.5 Data bus control. Provisions shall be made to
inhibit the ability of the Auxiliary Bus to enter data into the
DRU or change operating modes as follows:
a. Auxiliary Bus control shall be inhibited for 15
seconds after DRU turnon; i.e., the ability of the Auxiliary Bus
to enter data into the DRU or change operating modes shall be
inhibited for 15 seconds after DRU turnon. Status bit S1/0 shall
be set on both data buses during this time period.
b. At any time after 15 seconds after turnon, Auxiliary
Bus control shall automatically be enabled if no command has been
received on the Main Bus during the previous two seconds. STATUS
bit S1/0 shall be reset on both data buses when Auxiliary Bus
control is enabled.
34
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