Specifications

Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 47 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.11 Alarm Simulation Interface
Each Gaia CDMU provides monitoring capability of 8 Alarm inputs, as single ended switch-closure (SAC)
inputs.
AVI-1254/CDMU-793,CDMU-794/T
Alarm Simulation shall conform to the requirements of: [AD06] Table 3.5-28 (Relay Status Acquisition
Source Specification)
Note: The SAC driver interface specification is identical to RSA.
AVI-1639/CREATED/T
In open-loop test mode Alarm Inputs shall be commanded by local MMI or by the CCS (Test
Procedure or Command Line).
AVI-1640/CREATED/T
In closed loop test mode the RTS shall command the Alarm Inputs.
3.6.12 Bi-level Telemetry Status Simulation Interface
The Gaia EIU provides monitoring capability of 32 Bi-level Telemetry Status inputs.
AVI-1648/EIU-797,EIU-798/T
The Avionics SCOE shall provide 32 Bi-Level TM Status Simulation inputs to the GAIA EIU in
accordance with the following interface specification: [AD06] Table 3.5-33 (Bi-level Digital Source
Specification)
AVI-1649/CREATED/T
In open-loop test mode Status Inputs shall be commanded by local MMI or by the CCS (Test
Procedure or Command Line).
AVI-1650/CREATED/T
In closed loop test mode the RTS shall command the Bi-Level Telemetry Status.
3.6.13 Separation Strap Simulation
The EIU provides a facility for measuring the status of the GAIA Launch Separation Straps.
AVI-2890/EIU-780/T
The Avionics SCOE shall provide simulation of 5 relay closures for input to the EIU.
AVI-2891/EIU-782/T
Relay Closure simulation shall conform to the requirements of: [AD06] Table 3.5-28 (Relay Status
Acquisition Source Specification)
AVI-2892/CREATED/T
In open-loop test mode Separation Strap state shall be commanded by local MMI or by the CCS (Test
Procedure or Command Line).
AVI-2893/CREATED/T
In closed loop test mode, the RTS shall command the Separation Strap states required.
3.6.14 Relay Status Simulation
The CDMU and EIU provide a facility for measuring the status of relay closure inputs.
AVI-1673/EIU-780/T
The Avionics SCOE shall provide simulation of 2 (CDMU) and 128 (EIU) relay closures.
Note: The quantity defined here for the EIU includes those allocated for CPS LV Status Simulation -
Section 3.6.5.2 - and Separation Strap monitoring, Section 3.6.13.