INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page D.5
November 21, 2008
as indicated, the bus speed may be high or low speed depending upon the installation. Refer to
Appendix A and D for the data formats.
J1 PINS
NUMBER
SIGNAL NAME/SOURCE
CHECK PRESENCE OF FOLLOWING
LABELS
IRS/FMS input bus No. 1 Hi J1-18
J1-37
IRS/FMS input bus No. 1 Lo
IRS/FMS input bus No. 2 Hi J1-26
J1-27
IRS/FMS input bus No. 2 Lo
310 (Latitude)
DASD/FMS input bus No. 1 Hi J1-6
J1-7
DADS/FMS input bus No. 1 Lo
DADS/FMS input bus No. 2 Hi J1-10
J1-11
DADS/FMS input bus No. 2 Lo
203 (Altitude)
DIFF/GP input bus No. 1 Hi J1-23
J1-41
DIFF/GP input bus No. 1 Lo
DIFF/GP input bus No. 2 Hi J1-16
J1-17
DIFF/GP input bus No. 2 Lo
377 (Equipment ID)
J1-31 OMS input bus Hi
J1-32 OMS input bus Lo
227 (Command Summary Word)
J1-4 429 data Loader In H
J1-15 429 data Loader In L
201 (Command/Data)
High speed only
J3-60 429 In Freq/Function Data Source HI
J3-61 429 In Freq/Function Data Source LO
227 (Command Summary Word)*
J3-62 429 In Freq/Function Data Source HI
J3-63 429 In Freq/Function Data Source LO
227 (Command Summary Word)*
J3-64 429 X-Talk input bus #1 Hi
J3-65 429 X-Talk input bus #1 Lo
377 (Equipment ID)
High speed only
J3-67 429 X-Talk input bus #2 Hi
J3-68 429 X-Talk input bus #2 Lo
377 (Equipment ID)
High speed only
J3-41 429 in DME #1 HI
J3-42 429 in DME #1 LO
035 (DME Frequency)
Low speed only
J3-43 429 in DME #2 HI
J3-44 429 in DME #2 LO
035 (DME Frequency)
Low speed only
J3-37 429 in ILS #1 HI
J3-38 429 in ILS #1 LO
173 (Lateral Proportional Deviation)
Low speed only
J3-39 429 in ILS #2 HI
J3-40 429 in ILS #2 LO
173 (Lateral Proportional Deviation)
Low speed only
* Input #1 when Freq/Function Data Source Select Discrete Input pin is grounded; input #2 otherwise.
If these labels are actually present on the input busses of the GLSSU, verify their parity; bus activity is
reported independently of the SSM bits. If they are correct the fault is internal to the GLSSU, which
must be replaced.
If these labels are actually not present on the input busses, the fault is external to the GLSSU. Check
for wiring errors, polarity reversals, short-circuits, open-circuits, and for failure of the external
equipment.
However, it may happen that the aircraft interwiring is correct and that the external equipment is not
faulty but is not intended to output these particular data labels. Check for this eventuality by looking for
the presence of other data labels and checking their parity and SSM bits. If indeed the external
The document reference is online, please check the correspondence between the online documentation and the printed version.
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