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Space Shuttle Databus Interface for PC/ISA Computers

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Space Shuttle Databus Interface for PC/ISA Computers
PC-MDM-1
  • Low cost
  • Easy to use
  • Bus Controller or Remote Terminal
  • Develop, test, and simulate MDM databus interfaces
  • Includes driver software

Obsolete Product

This is an obsolete product and is no longer available for sale. For replacements of this product and for all new applications please consider the "Possible Replacements" at left, or browse our other products.

The MDM (Multiplexer/ Demultiplexer) databus provides serial communications between a Space Shuttle Payload General Support Computer (PGSC) and various subsystems. The MDM interface consists of a serial databus and three discrete signal lines: Message In, Message Out and Word.

The PC-MDM-1 is an IBM PC/AT (ISA) interface card that is capable of transmitting and receiving up to 32 data words in accordance with the MDM databus protocol.

The PC-MDM-1 may be configured to be either a bus controller or a remote terminal. As a bus controller, the host computer and PC-MDM-1 simulate the PGSC by controlling message traffic over the MDM databus. As a remote terminal, the PC-MDM-1 simulates a subsystem and responds to the bus controller. In either mode errors are detected and flagged.

Provided with the PC-MDM-1 are Windows® 95/NT and MS-DOS® drivers and libraries of C language functions that access data and control the card. The host computer can poll for the status of messages or use interrupts. A companion card, the PC-SSB-1, is also available for the Space Shuttle MIA bus.

TypeTitleDate
  Datasheet PC-MDM-1 Datasheet 4/18/2005
X Product Manual PC-MDM-1 Manual 3/20/2003
X API - Drivers - Test Program PC-MDM-1 WIN32 7/30/2012
X API - Drivers - Test Program PC-MDM-1 DOS 6/15/1997
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