Druck ADTS 405 R/F User manual

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ADTS 405 R/F
Altimeter Encoder Option
Instruction Manual

Copyright 1998 Baker Hughes Company.
English–ADTS 405 Altimeter Encoder Option User Manual | 1
Safety
This publication contains information and warnings that must be followed to ensure the safe
operation of the Air Data Test System. This manual describes the operation and use of the
Altimeter Encoder option of the ADTS 405. Further information and warnings are contained in the
main user manual for the ADTS 405.
Software Version
This publication is correct for software DK0127 issue No. 4.xx and above.
Associated Druck Publications
Abbreviations
The following abbreviations are used in this publication.
Note: Abbreviations are the same in the singular and plural.
1. Introduction
The ADTS 405 Altimeter Encoder Option allows the output from encoder altimeters to be
displayed on either the hand-held terminal or display and key-pad of the unit. The displayed data
includes the bit pattern and the equivalent altitude decoded from the bit pattern. The unit supplies
24 VDC to power the altimeter encoder electronics circuit and the altimeter vibrator circuit.
Document Number Description
K0114 ADTS 405 User Manual
K0157 ADTS 405 SCPI IEEE 488 Option User Manual
K0166 ADTS 405 Test Program Option User Manual
Abbreviation Description
ADTS Air Data Test System
CMOS Complementary Metal Oxide Silicon
DC Direct Current
ft Feet
LSB Least Significant Bit
mA Milli ampere
MSB Most Significant Bit
n/c Not Connected
No. Number
NSN National Stock Number
SCPI Standard Communications Protocol Interface
V Voltage

Copyright 1998 Baker Hughes Company.
2 | ADTS 405 Altimeter Encoder Option User Manual–English
1.1 Specification
2. Connections
The altimeter encoder can be connected to the rack mount unit at the rear or front connectors.
Note: To reduce power consumption during the power-up sequence, the unit should be switched
on and selected to measure mode before connecting the cable to the altimeter.
2.1 Cables and Connectors
On earlier units the front panel connector is identified as BUS MONITORS. On later units the front
panel connector is identified as ALTIMETER ENCODER with the pin and identification and
function shown in Table 1.
A standard cable assembly is supplied with this option, the details of pin/cable identification and
function are shown in Table 2. A 15-way, D-type connector is used for rear panel connection, the
details of pin identification and function are shown in Table 3.
For connection to AAU-32 units an optional cable assembly can be supplied, the details of
pin/cable identification and function are shown in Table 4.
2.2 Front Panel Connector
The front panel connector must be a MIL-C-38999 series 1½, size 12 shell receptacle with socket
contacts in 12-35 pattern. The pin identification and function are as follows:
Parameter Value
Inputa
a. Driven by switches connecting each input to 0V or equivalent electronic circuit. The unused most significant bits can
be left unconnected. The display shows an open circuit as “0”, a 0V shows as “1”.
11 bits, D2 to C4
HC CMOS inputs with input protection.
(internally “pulled up” to +5V)
Outputb
b. The ADTS 405 rack mount connectors are located on the front and rear panels. For the ADTS 405F the connector
is located on the front panel.
+24 VDC, 600 mA (maximum) to supply power to the altimeter encoder and
vibrator.
Connector Rear panel (rack unit) 15-way D-type
Front panel Deutsch Ltd. Part No. AS612-35PN-903M
WARNING Comply with all local safety orders.
Observe all safety procedures in the Aircraft Maintenance Manuals.
CAUTION Do not connect to both front and rear panel altimeter encoder
connectors at the same time.
Table 1: Front Panel Connector
Pin No. Function
1 C4 LSB
3 C2
5 C1
7 B4

Copyright 1998 Baker Hughes Company.
English–ADTS 405 Altimeter Encoder Option User Manual | 3
Note: C4 is the least significant bit and D2 the most significant bit; unused most significant bits
can be left open circuit.
2.3 Cable Assembly
A standard cable assembly is supplied as part of the altimeter encoder option. A Deutsch Ltd.
AS612-35PN-903M connector is fitted to one end of this 6 meter, 15-core cable assembly.
9 B2
11 B1
13 A4
22 A2
2 A1
4 D4
6 D2 MSB
8 Common (0V) signal
10 Common (0V) power
14 +24 V Vibrator
12 +24 V Encoder
Table 2: Altimeter Encoder Cable Assembly
Front Panel Connector
AS612-35PN-903M Pin
No.
Function Cable Color Code
1 C4 LSB brown
3 C2 Red
5 C1 Orange
7 B4 Yellow
9 B2 Green
11 B1 Blue
13 A4 Violet
22 A2 White
2 A1 Grey
4 D4 Black
6 D2 MSB Turquoise
8 Common (0V) signal Pink
10 Common (0V) power Yellow/red
14 +24 V Vibrator Red/blue
12 +24 V Encoder Green/red
Shell Case/ground Shell
Table 1: Front Panel Connector(Continued)
Pin No. Function

Copyright 1998 Baker Hughes Company.
4 | ADTS 405 Altimeter Encoder Option User Manual–English
Note: Druck Part No. ADTS405-1728-35-M0
2.4 Rear Panel Connector
The rear panel connector is a 15-way, D-type, the pin identification and function are as follows:
Note: C4 is the least significant bit and D2 the most significant bit; unused most significant bits
can be left open circuit.
2.5 Optional Cable (AAU-32 Units)
The 15-core cable is supplied for the AAU-32 encoder unit:
Note: The D2 data line (turquoise cable) is not defined for the AAU-32, it is for above 62,000 ft
and not connected.
Table 3: Rear Panel Connector
15-way,D-type
Connector Pin No. Function
1 C4 LSB
2 C2
3 C1
4 B4
5 B2
6 B1
7 A4
8 A2
9 A1
10 D4
11 D2 MSB
12 Common (0V) Signal
13 Common (0V) Power
14 +24 V Vibrator
15 +24 V Encoder
Shell Case/ground
Table 4: Optional Cable Connections
Front Panel Connector
AS612-35PN-903M Pin
No.
Function Cable color code AAU-32 connector
pins
1 C4 LSB Brown B
3 C2 Red C
5 C1 Orange D
7 B4 Yellow E
9 B2 Green F
11 B1 Blue G

Copyright 1998 Baker Hughes Company.
English–ADTS 405 Altimeter Encoder Option User Manual | 5
2.5.1 Cable Assembly Details
This optional 6 meter cable for AAU-32 encoder units (MIL-A-81852A) can be supplied as follows:
3. Operation
The altimeter encoder option consists of a PCB located in an option connector on the
motherboard providing a connector on the front and rear panels.
3.1 Displaying Encoder Data
To display the encoder data, make sure that the units of pressure measurement are aeronautical
(i.e., feet and knots) and the ADTS 405 is in measure mode.
To temporarily change the settings during operation use the set-up menu as follows:
13 A4 Violet H
22 A2 White J
2 A1 Grey K
4 D4 Black L
n/c D2 MSB Turquoise n/c
8 Common (0V) Signal Pink A
10 Common (0V) Power Yellow/red b + M
14 +24 V Vibrator Red/blue P
12 +24 V Encoder Green/red c
shell case/ground shell a + shell
Table 5: Optional Cable Details for AAU-32 Units
Item Part No.
Optional cable assembly for AAU-32 units Druck Part No. ADTS405-1891-61-M0
NSN 6625-01-435-6341
Front panel connector Deutsch Ltd. Part No. AS612-35PN-903M
AAU-32 connector Deutsch Ltd. Part No. RR06E16-26SN-9737
Table 4: Optional Cable Connections(Continued)
Front Panel Connector
AS612-35PN-903M Pin
No.
Function Cable color code AAU-32 connector
pins
[SETUP]
[MORE]
[DISPLAY OPTIONS]
[DISPLAY TYPE]
use [NEXT] or [PREV]
to select
[ENCODER]

Copyright 1998 Baker Hughes Company.
6 | ADTS 405 Altimeter Encoder Option User Manual–English
Press SAVE, then repeatedly press QUIT until the display shows the following:
Note: With an incorrect bit combination such as all zeros, the display shows “ENCODER
ERROR” in the place of the decoded value.
All normal ADTS 405 functions remain active when using the encoder option with all the normal
parameters available. The display shows all parameters except altitude as a single parameter in
the upper half of the display.
To set power-up defaults for this option, enter the CONFIG menu, select options and then
encoder as follows:
Press the SAVE key, to store the selection, then repeatedly press QUIT until the display shows
the normal encoder option data.
3.2 Errors
The display shows “ENCODER ERROR” in the place of a decoded altitude value when the bit
pattern does not decode to an equivalent altitude.
3.2.1 Bit Pattern All Ones
Possible causes:
1. Altimeter encoder option not fitted.
1 Controlled or measured parameter. 2 Aim (set-point or target) in control mode,
or “Leak Measure” when the pressure
controller is off.
3 Measured value. 4 “<” Pointer for parameter, i.e. aim that
changes on data entry.
5 Units of measurement. 6 Altitude encoder bit code.
7 Special messages, e.g. warm-up
period.
8 Altitude encoder decoded value.
Alt 5000 ft
Aim 5000<
D2 to C4>00001010010
CODE 5000 WARMUP
1
3
5
7
8
4
2
6
[SETUP + F1 (CONFIG)]
[MORE]
[DISPLAY OPTIONS]
[DISPLAY TYPE]
use [NEXT] or [PREV]
to select
[ENCODER]
Alt 5000 ft
Aim 5000<
D2 to C4>11111111111
CODE ENCODER ERROR

Copyright 1998 Baker Hughes Company.
English–ADTS 405 Altimeter Encoder Option User Manual | 7
2. Faulty altimeter.
3.2.2 Bit Pattern All Zeros
Possible causes:
1. Altimeter not connected.
2. Altimeter switched off.
3. Altimeter strobe (transponder) input not grounded.
4. Faulty altimeter.
3.2.3 Stuck Digit in Bit Pattern
If one digit remains unchanged with changing pressure the possible causes would be:
1. Cable fault - check continuity (refer to Table 2 or Table 4).
2. Faulty altimeter.
Alt 5000 ft
Aim 5000<
D2 to C4>00000000000
CODE ENCODER ERROR

Copyright 1998 Baker Hughes Company.
8 | ADTS 405 Altimeter Encoder Option User Manual–English

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K0170 Revision A | English
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