Products / NTDS/ATDS


Proven high-performance serial NTDS for VMEbus computers

Versatile single board computer with serial NTDS I/O channel

The Serial NTDS connects VMEbus computers to military computers and peripherals with MIL-STD-1397C Type D (NTDS Serial) and E (Low Level Serial) interfaces. But it’s capabilities go far beyond those of a conventional I/O board. It’s architecture is unique in the industry because it combines the power and reliability of a 32-bit MC68020 processor and an industry standard VMEbus interface controller. With onboard memory, an onboard debugger, and the ability to run C or assembly language programs from RAM or EPROM, the Serial NTDS is a powerful and versatile single board computer with a full duplex NTDS I/O channel. The Serial NTDS supports distributed processing with the ability to run user applications onboard, which improves VMEbus bandwidth and offloads the host computer.

General Product Features


• MIL-STD-1397C, Type D and E compliant
• Full-duplex, 32-bit serial NTDS transfers at 10Mbits/sec.
• User-programmable MC68020 CPU
• Standard VMEbus Interface Controller (VIC) for 100% VMEbus compatibility
• High-speed, 32-bit Block Mode VME transfer
• 512KB RAM for NTDS I/O, CPU, and VMEbus access
• Dynamically allocate RAM for NTDS I/O or onboard programs
• User EPROM socket supports up to 1MB of user programs
• Parallel access to NTDS data and status words
• Independent word count registers and time-out counters for NTDS input and output
• Independent transmit and receive transaction cancel
• Maskable interrupts
• Built-in Test (BIT) with internal loopback capability
• Built-in, menu-driven System Monitor program links Serial Hawke to PC or terminal via RS-232C port
• Built-in Assembler/Disassembler and Debugger
• Perform loopback and basic NTDS operations from a menu-driven interface without software
• Perform internal loopback without disconnecting cables
• Front panel LEDs for Reset, Bus Error, User, Halt, Test and Watchdog timer
• Up to 16 Serial Hawke boards may be used in a single VMEbus system


• Single word or burst mode NTDS transfers
• Fully configurable SIS/SOS control frames
• Ability to disable SIS/SOS for testing
• Programmable Sink and Source time-out counters
• Supports all MIL-STD-1397C System Integrity Features
• Parity error, framing error, illegal condition
• SIS time-out (No SIS control frame or IF from source)
• SOS or IF time-out (No SOS control frame response from Sink)
• Sink NOT READY time-out (SIS NOT READY control frame response from Sink)

Software Drivers Available*

• PowerIO
• (Operating Systems supported by PowerIO™ drivers and includes: VxWorks®, Solaris™, Linux®, HP-UX)
*Contact factory for new OS support

VME NTDS Serial D and E Technical Specs

NTDS interface

MIL-STD-1397C, type D
MIL-STD-1397C, type E

VMEbus interface

VME revision C.1 (IEEE P1014)


MC68020, 32 bit CPU


512 KB

NTDS I/O connector

D: 2 BNC isolated coaxial, (Amphenol P/N 31-10-75)
E: 2 tri-axial –isolated, (Trompeter P/N BJ77TL)

RS-232C connector

DB9 male

Form factor

Single-wide 6U eurocard


540 g (1 lb. 3 oz.)

Power consumption

+5Vdc @ 2.6A
-12Vdc @ 60mA

Relative humidity

0% to 90% (non-condensing)


8KB to 1MB supported

Operating temperature

0°C to +55°C

Type Title
Data Sheet Download
Manual Request Login
Software Request Login

Model Numbers


CA-01001-XX Type E Triax, PL74-7 to PL74-7 Cable Set**
CA-00119-XX Type E Triax, PL74-7 to BJ89-7 Cable Set**
CA-00158-XX Type E Triax, PL74-32 to PL155-32 Cable Set**
CA-EA04U-XX Type E Triax, PL80-7 to PL80-7 Cable Set**
CA-01058-XX Type D Coax, UPL20-2 to UPL20-2 Cable Set**
CA-EA03U-XX Type D Coax, UPL20 to UPL20 Cable Set**
AN-ST012-00 NTDS Type E Serial Isolation Tap
AN-ST013-00 NTDS Type D Serial Isolation Tap
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