GE VMIVME-2128 128-bit High-Voltage Digital Output Board

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. 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 these

warming 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.

Features

The following brief overview of principal features illustrates the flexibility and

performance that is available with the VMIVME-3113A Board:

• 64 differential or single-ended inputs

• Powers up in AUTOSCANNING MODE - no software initialization required

• Continually digitizes all input channels and stores the results in a dedicated

channel dual-port register (AUTOSCANNING MODE)

• Six operating modes

— AUTOSCANNING MODE *

— RANDOM POLL MODE

— RANDOM INTERRUPT MODE

— SCANNING POLL MODE

— SCANNING INTERRUPT MODE

— AUTOSCANNING MODE with BIT

* Only for gain = 1 and a minimum of 16 channels.

• VMEbus interrupts may be programmed to interrupt upon completion of a

single A/D conversion, or upon completion of a 16 through 64-channel scan

(see “Analog-to-Digital (ADC) Control and Timing” on page 26)

• User-programmable interval timer supports scanning of all channels at periodic intervals

• Jumper-programmable gains of 1, 10, 100, 200 and 500

• Selectable A/D ranges of 0 to +10V, ±5V and ±10V

• Low-level and high-level inputs: ±10mV to ±10V

• Optional low pass filter

• Overvoltage protected inputs

• 5 x 106

Ω input impedance differential and 2x106

Ω input impedance

single-ended

• 33 kHz conversion rate at GAIN<500 (23kHz for GAIN = 500)

• Selectable output code: binary, offset binary, two's complement with sign extension

• Front panel Fail LED is under program control and may be used for any purpose

• Board ID register