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Figure 3-10
Status byte register
Bit position
Decimal Weighting
Value
*TST? — self-test query
NOTE
This command activates all paths of both relays. Make certain the system is in a state
that can permit all paths of both relays to be opened and closed.
Use this query command to perform a self-test for the relay actuation mechanism.
This command initiates the following sequence:
1.
All paths of both relays are opened.
2.
One path is closed (for both relays) and the indicator is read back. This occurs for each
path. This ensures the actuator is energized and that only the single path closed.
3.
The command places the coded result (0 or 1) in the output queue.
When the unit is addressed to talk, the coded result is sent from the output queue to the
computer.
A returned value of one (1) indicates that the test passed, and a value of zero (0) indicates
that the test failed.
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B7
B6
B5
B4
MSS
ESB MAV
Event
RQS
64
32
16
6
5
(2
)
(2
(2
)
0/1
0/1
0/1
Events: MSS = Master Summary Status
RQS = Request Service
ESB = Event Summary Bit
MAV = Message Available
EAV = Error Available
MSB = Measurement Available Bit
Value:
1 = Event bit set
0 = Event bit cleared
B3
B2
B1
B0
EAV
4
4
2
)
(2
)
0/1
Run relay self test and read result
Operation
3-25
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