APBUS: Attached Payload BUS for Kibo Exposed Facility Payload

Exposed Facility

Attached Payload BUS for Kibo Exposed Facility Payload: APBUS

Necessities for Kibo Exposed Facility Utilization

Example for utilization of Attached Payload Bus
(Space Environment Data Acquisition Equipment-Attached Payload)

MSTR: Mission Interface Structure

BSTR

PSTR

The Mission Interface Structure (MSTR) is needed to assemble Kibo exposed facility payloads. The next step is required to perform experiments or observations on the Kibo Exposed Facility. Experiment payload is mounted on the Kibo Exposed Pallet, grasped Kibo Robot Arm and transported to the predetermined position, and then installed at the predetermined port of the Kibo Exposed Facility. Launch, onboard transportation, and installation require payloads to be equipped with special attachments; PAM-PU, GF, PIU. These attachments require accurate alignment for installation. Therefore it is not easy to assemble a structure that satisfies the above requirements.
The Mission Interface Structure satisfies all the above interface requirements. Consequently, use of Mission Interface Structure make it possible to launch, transport, and install payloads on Kibo.
There are two type for Mission Interface Structure; Box structure (BSTR) and Pallet structure (PSTR). You can select the one suitable for your experiment.

Basic Specifications (approximate)
	Material	; aluminum alloy
	Size	; height;760 mm, width;800 mm, depth;1,850 mm
	Mass	; BSTR 230 kg, PSTR; 210 kg (including PIU, FRGF, PAM-PU^*1)
	Maximum exhaust heat capacity (passive)
		;BSTR; 300 W, PSTR; 180 W (Depends on exhaust heat area)
Equipment loading ability (in case of Launch/Recovery by Kibo Exposed Pallet)
		;BSTR; total mass 500 kg
		;PSTR; total mass 400 kg

*1;	PIU: Payload Interface Unit GF: Grapple Fixture PAM-PU: Payload Attach Mechanism-Payload Unit

HCE: Heater Control Equipment

HCE

HCE detects experiment equipment temperature and keeps experiment equipment warm by providing electrical power to the heater in case the sensor detects a preset temperature. Individual control is possible for each heater channel.

Basic Specifications (approximate)
	Mass	: 2 kg
	Number of channels	: 8ch max
	Supply electric current	: 330 mA max/ch Total 1 A max
	Controllable temperature range	: -44 to +1 deg.C

APRT: Attached Payload Remote Terminal

APRT

A specific communications protocol for Kibo is used on ISS and Kibo. Signals of experiment equipment need to be converted to the Kibo specific communications protocol to perform experiments on the Kibo.
APRT can convert signals of experiment equipment to the Kibo specific communications protocol. APRT enables performing experiments on Kibo. You can select telemetry/command number of channels from the ranges bellow.

Basic Specifications (approximate)
	Mass	:	6 kg
	Communication protocol with Kibo	:	low rate payload bus (MIL-STDD-1553B)
Communication protocol with experiment equipment
	Discrete command (DC)	:	64 ch max
	Serial magnitude command (SMC)	:	10 users max
	Active analog (AA)	:	total 64 ch max for AA, PA, AB, PB
	Passive analog (PA)	:	ditto
	Active bi-level (AB)	:	ditto
	Passive bi-level (PB)	:	ditto
	Serial digital (SD)	:	10 ch max

PDAP: Power Distribution box for Attached Payload

PDAP

120 V electrical power is supplied on the Kibo Exposed Facility. This electrical power has specific electrical characteristics. Additionally, experiment equipment must satisfy specific interface conditions (ex. Load characteristic) to connect to the Kibo Exposed Facility.
PDAP can meet above conditions and transform electrical power to 28 V that is easy for experiment equipment to use. Besides, PDAP can distribute electrical power to multiple lines (12 ch max).

Basic Specifications (approximate)
	Mass	:	7 kg
	Electrical efficiency	:	70 % and over
	Input voltage range	:	110.5 to 126.0 Vdc
	Output voltage range	:	28±2 V
	Supplying electrical power	:	Total 300 W and bellow
	Supplying number of channels	:	12 ch max

EMA: Extension Mechanism Assembly

SEDA-AP extended configuration

Visual Indicator

Some Kibo Exposed Facility experiments need an extension from the main structure. EMA was developed for this purpose. EMA can extend 1m with experiment equipment on the tip of an extendable mast. Also, EMA can stow the extendable mast within the MSTR as required.
Manned space environment like the Space Shuttle strongly require that the EMA be positively fixed so as not to be extended by error. EMA has a Launch Lock Mechanism (LLM) to positively fix the extendable mast during launch and landing, and to release the extendable mast to perform experiments on the Kibo Exposed Facility.
The extendable mast is extended or stowed and the launch lock mechanism is locked or released automatically by commanding from ground.
EMA is compatible with extra vehicular activity (EVA). Astronauts can extend or stow and lock or release the mast by EVA manual operation in case of automatic operation failure.

Basic Specifications (approximate)
	Extension length	:	1 m
	Loading ability on tip of Mast	:	50 kg max
	Allowable operation cycles	:	100 times or more
	Equip Launch Lock Mechanism (with backup lock)
	Status monitoring for Extension and Launch Lock Mechanism	:	electrical signal (individual two line)
		:	mechanical indication mechanism (visual indicator)

Last Updated : February 9, 2005