A6140 9199-00058 EMERSON Controller Vibration Monitor Module

Description

Buffer access control is done A6140 using a control/status bit pair in register E for each of

the two buffers. One bit is written by the Controller, and the other is written by the

Servo Driver. When the two bits are equal, the buffer is not busy and data can be

written into the buffer. When the bits are different, a transfer A6140 is in progress and no

data modifification should occur from either the Controller or the Servo Driver side.

When the Controller transfers data to the Servo Driver, it fifirst verififies the buffer is

available by ensuring that Bits 12 and 14 or register E are equal. Next, the Controller

writes a message into the buffer. The maximum message length is 64 words. Once

all the data was written, the Controller toggles the control bit (Bit 12 of register E)

for the buffer.

The Servo Driver A6140 periodically calls a routine that polls the buffer control bits, and

compares the two bits of the bit pair. If the bits associated with the Controller-to

Servo Driver buffer are different, then a message has arrived. The Servo Driver

reads the message, then toggles the status bit associated with the buffer, which

indicates the message was received. The buffer is now available because the bits are

equal.

Each message between the Controller and Servo Driver conforms to a simple format

and set of rules. The message has a two word header; A6140 the fifirst word is a message

type, and the second word is subtype, or could be called a type modififier. Typically

the subtype contains the byte count for the remaining message. Multiple messages

may be placed in the buffer if space allows. Valid message data is terminated by

placing a zero after the last valid message. (Message type equal to 0 is treated as a

terminator for the message processor.)

Message type 1 is a text command string. The string is moved from the Ovation

memory into a FIFO that is A6140 processed by the terminal character processing routines.

This means that all the commands and calibration constants can be entered either

through the terminal or through the Ovation serial interface.

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