TM 1–1520–238–T–3
9–2
MULTIPLEX READ CODE INTERPRETATIONS
9–1 SIGNAL NAME:
CPG MRTU TYPE III STATUS WORD TERMINAL FLAG
MEMORY LOCATION: 000566
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates PASS or FAIL status of multiplex remote terminal unit (MRTU)
internal self–tests.
REMARKS: From copilot/gunner (CPG) MRTU Type III to fire control computer (FCC).
PASS:
If first digit on heads out display (HOD) is 0, 2, 4, or 6, go to paragraph 9–9.
FAIL: Location of fault: go to paragraph 9–2.
9–2 SIGNAL NAME:
CPG MRTU TYPE III STATUS WORD BBC STATUS BIT
MEMORY LOCATION: 000566
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates self–test status of the back–up bus controller (BBC).
REMARKS: From CPG MRTU TYPE III to FCC.
PASS:
If first digit on HOD is 2 or 6, go to paragraph 9–3.
FAIL: Location of fault: MUX CPG circuit breaker, wiring from MUX CPG circuit breaker to CPG
MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
9–3 SIGNAL NAME:
CPG MRTU TYPE III STATUS WORD OUTPUT CLEAR
MEMORY LOCATION: 000566
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates all MRTU outputs are cleared.
REMARKS: From CPG MRTU Type III to FCC.
PASS:
If first digit on HOD is 6, go to paragraph 9–4.
FAIL: Location of fault: MUX CPG circuit breaker, wiring from MUX CPG circuit breaker to CPG
MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
9–4 SIGNAL NAME:
CPG MRTU TYPE III STATUS DISCRETE OUTPUT BIT
MEMORY LOCATION: 000566
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates self–test status of 5 Volt (V) direct current (DC) discrete outputs.
REMARKS: From CPG MRTU Type III to FCC.
PASS:
If second digit on HOD is 1, 3, 5, or 7, go to paragraph 9–5.
FAIL: Location of fault: MUX CPG circuit breaker, wiring from MUX CPG circuit breaker to CPG
MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–2).
