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HDEterm68

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HDEterm68 Description

The high density 68 pin SCSI II/III connector is being used for purposes other than SCSI interfaces because of board and front panel space limitations. For example in the PMC/XMC environment SCSI connectors provide an excellent size and pin count for the front panel space allowed.

HDEterm68 provides an easy way to get from a high density SCSI connector to discrete wires. For example with the PMC-Parallel-TTL design a standard SCSI cable can be used to connect the PMC to HDEterm68, and then to the system wiring via the screw terminal strips provided. HDEterm68 provides a space efficient, low cost method of interconnecting the control electronics to the rest of the sensors, IO, machinery etc.

HDEterm68 comes with two SCSI II/III compatible connectors. One connector could be used for a termination plug or for a second SCSI cable. The screw terminals could then be used as testpoints. The SCSI connectors are connected to the screw terminals and to each other 1:1. The "in" SCSI connector is connected to the screw terminals and then to the "out" connector. The SCSI connectors can be right angle "-H" or vertical "V" or mixed "-M".

The SCSI connectors and terminal block are interconnected with differentially routed matched length traces. With Revision F of the standard board, and Revision A of the -ENG version, Internal ground/power planes are used to reference the traces to provide 100 ohm differential impedance.

On the -ENG model several sets of resistors allow isolation and termination options. For example the two SCSI connectors can be isolated and the header strips used to reconnect in a custom manner. In addition two header strips are available to allow for loop-back and custom terminations. The first header "TP1" is tied via 0402 resistors to P1 [primary SCSI connector]. The resistors are optionally installed to allow direct connection or terminated connection, resistive, capacitative etc. to the header strip. The second header strip "TP2" is tied to the terminal block. The isolation resistors between P1 and the terminal block can be left uninstalled and the path through the TP1 header used to allow for wiring options and other added circuitry. Please note that TP1 and TP2 are installed by customer request. Additional features include: power entry and distribution posts, oscillator, regulator, LED and transceiver positions. Please send us your specifications. We will assign a modified part number and build a custom terminal block for you.

The standard configuration uses a minimized PCB that interconnects the two SCSI connectors, terminal strip and screw terminal block. The routing is matched from P1 to the terminal strip and from the terminal strip to P2.

HDEcabl68 is compatible with Dynamic Engineering PMC and XMC carriers when ordered with the -SCSI option. Also compatible with PMC-BiSerial series and other SCSI connector based designs. Frequently HDEcabl68 - SCSI cable is used with HDEterm68 to create a snap together break out system for your signals.

HDEterm68 Features

Size
7.415 x 2.878 for std and -ENG models without housing.
Characteristics
1:1 from SCSI pin to Screw Terminals. 100 ohm matched length differential pairs from SCSI connector to Screw Terminals to SCSI. Internal ground plane referenced to cable shield.
Mounting
Available with plastic housing and DIN Rail mounting system or sans plastic with standoff mount.

HDEterm68 Benefits

Ease of Use
Snap together system with HDEcabl68 and HDEterm68. Plug into DIN raii system or screw down with standoff mounting. Second SCSI connector available to pass through HDEterm68, allow for termination at the connector.
Price
HDEterm68 is available at a reasonable price and lead time. See the on-line storefront at the top of this page.
Availability
Dynamic Engineering keeps stock of the standard options. For custom versions: a short lead time for our in house manufacturing staff to make yours.
SCSI Compatibility
HDEterm68 is SCSI compatible and useful for many applications.

Part Number:HDEterm68
Ordering Options

    SCSI II/III compatible with cable locks. Thumbscrew interface option.
    SCSI connectors can be vertical, horizontal or mixed. Please specify -V, -H or -M
    2 row by 34 terminal strip with side entry wires and top screw lock. Rows are offset for ease of access.
    Available with plastic and DIN rails -P
    Also available without the plastic and terminal block for a low cost loop-back fixture.
    Weight:
    With plastic: 10.5oz
    Without plastic: 6.5oz

    HDEterm68-VP = vertical SCSI connectors with plastic, Screw terminals, no header strip
    HDEterm68-HP = horizontal SCSI connectors with plastic, Screw terminals, no header strip
    HDEterm68-MP = 1 horizontal and 1 vertical connector with plastic, Screw terminals, no header strip
    Leave off the "P" if no plastic / DIN rails are desired.
    HDEterm68-HS1 = 1 SCSI connector(H), no plastic. Stand-offs for mounting. Header Strip [ no terminal block], built on standard fab
    HDEterm68-HS2 = 1 SCSI connector(H), no plastic. Stand-offs for mounting. Header Strip and terminal block, built on standard fab
    HDEterm68-HS3 = 2 horizontal SCSI connectors(H), Surround with Din Rail mounts, Header Strip, no terminal block, built on standard fab
    HDEterm68-VS3 = 2 vertical SCSI connectors(V), Surround with Din Rail mounts, Header Strip, no terminal block, built on standard fab
    HDEterm68-ENG1 = Uses "ENG Fab", standard resistor options, 1 SCSI connector(H), no plastic. Stand-offs for mounting. Header Strip
    HDEterm68-ENG5 = Uses "ENG Fab", horizontal SCSI Connectors(2) interconnected to header strips(TP1 & TP2 separately), pre-assembled shunts(68) between header strips, Terminal Block installed [connected to header strip TP2], plastic surround with DIN rail mounting


    Other related models: HDEterm100 is a "D100" version, HDRterm50 is a 50 position ribbon cable version, DINterm64 is a 64 position ribbon cable version, and UARTcable8 is a specialized breakout for PMC-BiSerial-VI-UART with 8 UART ports on the SCSI converted to 8 discrete DB9 connectors.

Custom Length SCSI Cable

Send us an e-mail - sales@dyneng.com with your requirements. Be sure to include the length, retention [clip / screw], and quantity. Please be aware that custom lengths will take several weeks to process. Pricing is quantity sensitive.

HDEterm68 Additional Information

HDEterm68 mechanical mounting data is available with the HDEterm68 Mechanical Dimensions drawing.
HDEterm68-ENG mechanical mounting data is available with the HDEterm68-ENG Mechanical Dimensions drawing.
Locations and dimensions of the mounting holes and board, height with and without plastic are included.


Schematics for the HDEterm68 are provided to show the standard configuration and possibilities for terminations, loop-back, signal sources etc. with the -ENG model
Reference HDEterm68 Standard Schematic
Reference HDEterm68-ENG Schematic
Reference Statement of Volatility