Pressure Systems 9816, 98RK user manual Cluster, Rack, and Slot Identification

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

2.3.4.6Calibration Manifold Position Detector Circuit

The transducer calibration manifold position detector circuit uses reflective infrared sensors to sense the actual position of the manifold valve block. The block, located within the valve assembly, is shifted to a desired position by pneumatic pistons positioned around the block.

Two reflective infrared sensors, which sense the position of the block by the reflection of the sensor infrared beam from the block surface, are mounted into the assembly. If the block is in front of the sensor, a low level logic signal is output by the sensor, indicating the presence of the block. If the block is not in front of the sensor, the infrared beam is not reflected and the sensor outputs a logic high signal.

Outputs of these sensors are routed to the PC-299 microprocessor board and then to the CAL and purge (PRG) LEDs on the front of the module chassis. The following table shows the position of the transducer calibration manifold assembly corresponding to front panel LED illumination.

LED INDICATORS

VALVE POSITION	CAL	PRG
RUN	OFF	OFF
CAL	ON	OFF
PURGE	ON	ON
LEAK/CHARGE	OFF	ON

2.3.5Cluster, Rack, and Slot Identification

The 98RK-1 Scanner Interface Rack can operate as a single unit, with one (1) to eight (8) pressure scanners installed in each rack. Racks may also be grouped together as a cluster of racks as part of a larger data acquisition system.

In order to physically identify individual scanners within a data acquisition system, a simple addressing scheme is available. Individual scanners are identified by their Cluster, Rack, and Slot (CRS) address, a three-digit hexadecimal number.

A cluster (the most significant address unit), is numbered 0-F (hex), for a total of 16 clusters of racks.

A rack (the middle address digit), may be numbered 0-15, for a total of 16 racks. (NOTE: The switch for setting the rack address is numbered in integers, but the address is returned in hex — 0-F.)

A slot (the least significant address unit), numbered 1 through 8, designates a particular 9816 pressure scanner.

The diagram on the following page depicts the 98RK-1 Scanner Interface Rack front pullout panel with switches identified for setting Cluster and Rack addresses. Cluster and Rack addresses may be set at any number (user option) as long as it falls within the range of the

Page 26 www.PressureSystems.com