TM 1–1520–238–T–3
Change 4
8–13
8–13 SIGNAL NAME:
BIT OVERIDE COMMAND
MEMORY LOCATION: 001440
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Commands RHE to terminate BIT test and provide FCC with results of any BIT
performed.
REMARKS: From FCC to RHE.
PASS:
If first digit on HOD is 0, 1, 4, or 5, go to paragraph 8–14.
FAIL: Location of fault: RHE, FCC. Troubleshoot wiring to isolate fault (TM 9–1427–475–20).
8–14 SIGNAL NAME:
BIT IN PROGRESS
MEMORY LOCATION: 001342
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates HME is performing BIT.
REMARKS: From RHE to FCC.
PASS:
If fifth digit on HOD is 0, 1, 2, or 3, go to paragraph 8–15.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–15 SIGNAL NAME:
INVALID COMMAND
MEMORY LOCATION: 001342
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates to operator that RHE has determined that present command cannot
be followed due to hardware configuration.
REMARKS: From RHE to FCC.
PASS:
If fifth digit on HOD is 0, 2, 4, or 6, go to paragraph 8–16.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–16 SIGNAL NAME:
RHE BIT PERFORMED
MEMORY LOCATION: 001347
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates to FCC that RHE BIT has been performed.
REMARKS: From RHE to FCC.
PASS:
If sixth digit on HOD is 1, go to paragraph 8–17.
FAIL: Location of fault: replace RHE (TM 9–1427–475–20).
8–17 SIGNAL NAME:
RHE STATUS WORD TERMINAL FLAG (ACY) RHE RECEIVE MSG (ACZ)
MEMORY LOCATION: 001270
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates an error has been detected by RHE direct memory access (DMA)
controller.
REMARKS: From RHE to FCC.
PASS:
If first digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 8–25.
FAIL: Location of fault: go to paragraph 8–18.
