Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 4-24
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
Table 4-1. SDU Standalone Identification System (SIS) Interface Characteristics (Continued)
21 Access protection
Read only from SIS Connector
22 Memory endurance >100,000 cycles
23 Memory data retention >30 years
24
VDD, SCL, SDA, VSS Out-of-Range protection No loss of other SDU operational functions for
voltages in the range -12.6 < V < +12.6 applied
for 5 s
(3) The Front-Panel 9-way D-SUB connector has a green symbol beside it to indicate that
this is the SDU Standalone Identification System (SIS) Interface Connector.
(4) The SDU Standalone Identification System (SIS) Interface is routed to the ACD
Processor.
(5) No single failure of the SDU Standalone Identification System (SIS) Interface causes the
loss of other SDU operational functions.
(6) The SDU Standalone Identification System (SIS) Interface has the memory addresses
0xFFB0 - 0xFFFF.
4. General Interface Requirement
A. Output Power Detector Function
(1) The HPA provides a sample of the power amplifier output for forward and reflected
energy.
(2) The samples of forward and reflected output power are implemented with a directivity >
23 dB.
(3) The output power detector functions for the forward sample and the reflected sample are
able to measure signals in a logarithmic response over the output dynamic range so
modified to account for insertion loss from the Power Amplifier to Tx output port, with an
accuracy of less than ±0.5 dB over level, temperature and frequency.
(4) The output detector functions provides broadband (Tx-band) rms power detection with a
nominal response time of 1 ms. The output power detector analog to digital conversion
oversampling capability should be at least two times that of the detector response time.
(5) For the current ARINC-429 label 143 HPA Status word reporting interval the following
applies:
(a) When the state of indication of "Actual Power Out Status" is assessed as "Actual
Power" then the largest forward output power sample is reported as the "Actual
Peak Power".
(b) When the state of indication of "Actual Power Out Status" is assessed as "Held
Power" then the largest forward output power sample of the most recent
reporting interval when the "Actual Power Out Status" was "Actual Power" is
reported for the "Actual Peak Power".
(6) For purposes of conveyance in ARINC-429 label 143 HPA Status word "Actual Peak
Power", the largest forward output power sample is expressed as a 2's complement
signed binary number of the numeric value derived in accordance with the following
formulation:
DRAFT
3rd rvw Draft as of:
29 January, 2020