JR3 VME-2105 Serial Receiver

The JR3 VME-2105 Serial Receiver is a member of the JR3 family of serial receivers. It interfaces the VMEbus to any of JR3's high speed, serial, six axis, force and torque transducers. It has a form factor which allows it to plug directly into any single width, double height, 6U-VMEbus slot.

The VMEbus receiver directly interfaces to the force sensor through a small 6 or 8 wire cable. The VMEbus receiver uses the cable to provide power to the sensor, as well as to receive the high speed serial data from the sensor. The VMEbus receiver contains circuitry to monitor and adjust the power supply voltage to the sensor. The automatic power supply adjustment means that the sensor cable requirements are very forgiving. Long, small gage wires can be used with success. And since the VMEbus receiver receives power directly from the computer bus, no external power supply is required.

The VMEbus receiver uses an Analog Devices ADSP-2105, a 10 Mips digital signal processing chip. This chip has the ability to provide decoupled and filtered data at 8 kHz per axis. This data rate is an order of magnitude faster than previously available in the industry. Some of the signal processing functions performed by the VMEbus receiver include: decoupling, coordinate transformation (translation and rotation), low-pass filtering, vector magnitude calculation, maximum and minimum peak capture, threshold monitoring, and rate calculations.

The VMEbus receiver communicates to the host computer through 32k-bytes of shared memory in the A24 address space. The interface adheres to ANSI/IEEE 1014-1987, the VMEbus specification.