GE VMIVME-7740 VME Single Board Computer

Introduction

The ACC-0603RC is a Rear Transition Module (RTM), designed to transition the

V7865 I/O signals from the VME P2 connector to standard I/O connectors.

The panel I/O access provides:

• One serial port connector (DB9), supporting both RS232 and RS422

• Two standard USB 2.0 connectors

• Digital Visual Interface-Digital (DVI-D) video support

• One Serial ATA (SATA) connector

The onboard I/O access provides:

• One PIM I/O interface

• One SATA connector

See Figure 1-1 on page 12 for an illustration of the board and connector layout.

The VME P2 connector carries all associated signals. All signals are routed from the

single board computer (SBC) (installed in the front of the chassis) through the

backplane to the ACC-0603RC P2 connector. Figure 1-2 on page 13 is an illustration of

the ACC-0603RC installed in the VME rear I/O.

Output Drivers: The output drivers provide the user with thermal and inrush current shutdown protection.

The inrush current protection will allow up to 990 mA of surge current before shutting down the driver. 

This current is determined by the type and number of bulbs used. 

For example, two 40 mA 28 V filament bulbs may have as much as 960 mA ((40 mA x 2) x 12 = 960 mA)

of cold filament inrush current. 

• 128 bits of high-voltage outputs

• High-current drivers (600 mA sink)

• Automatic surge current shutdown protection

• Thermal shutdown protection

• High breakdown voltage (55 V)

• Output clamp diodes for inductive flyback protection

• Compatible with Intelligent I/O Controllers

• Built-in-Test logic for fault isolation

• VMEbus compatible (ANSI/IEEE STD 1014-1987 IEC 821 and 297)

• A24:A16:D32/D16/D08 (EO): slave 39/3D:29/2D:6U form factor

• Optional pull-up resistors for electronic switch outputs

• Front panel with fail LED

• Sockets are provided for warming resistors, which are supplied by the user

If the inrush current of the external circuitry will exceed the 990 mA limit, then warming resistors should be used. These resistors should

draw approximately 10 percent of the rated (warm) current of the bulb or bulbs in use. 

For the example above, this current would be 8 mA ((40 mA x 2) x .1 =8 mA). SIP sockets are provided on the board for thesewarming resistors. 

These resistors must be the bussed type with pin 1 being common. 

The sockets have pin 1 grounded.

Electronic Switch Option: Optional pull-up resistors are available which place the output drivers in an

electronic switch configuration. These switch outputs are operated from user-supplied power via the P2 connector.*

Data Polarity: A logic one written to an output bit will turn ON the drive transistor. 

This yields an output of logic zero. Thus, a logic one asserts the output. 

This data polarity is called positive true.

PHYSICAL/ENVIRONMENTAL

Temperature Range: 0 to +55 °C, operating,-20 to +85 °C, storage

Humidity Range: 20 to 80 percent relative,noncondensing

Altitude: Operation to 10,000 ft

Cooling: Forced air convection

Dimensions: Double Eurocard (6U), 160 x 233.35 mm

Power Requirements: 3.0 A (typical) at 5 V

The user must supply power to the output drivers. 

This power requirement is determined by the user load.

Connections can be made at either the front panel (P3 or P4) or at P2. 

To facilitate connections made at P2, VMIC offers the VMIACC-0132 P2 Power Accessory which is recommended, but not required.

MTBF: 162,900 hours (217F)

Warning: The user-supplied voltage should not be applied to the board unless +5 VDC is present on the board.

We have the same series of models in stock.  If you don't find the model you need, please contact us and we will provide you with an official quotation！

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