Milltronics CVCC Manuel d'instructions télécharger pdf (Page 27)

BIC-II MESSAGES

The following messages may be transmitted from the host to instruct the BIC-II to perform the operation

specified. The ASCII characters have been provided as an example only.

RAM TABLE REQUEST

This message is transmitted from the host to retrieve the message stored in the BIC-II RAM table.

Data ASCII Example

Field Character Description

SOM STX start of message

BIC-II I.D. 1 BIC-II #1 (e.g.) (range = 1 to 8)

MT 20 retrieve data from the RAM table

POINT 001 point #1 (e.g.) (range = 000 to 099, dependent upon product)

EOM CR end of message

The host will receive a product message in response to this request. (Refer to Product Messages).

Retrieve data from the RAM Table until data for all points has

been retrieved. FIFO Buffer Requests may then be used to

retrieve data for updated points only, to reduce message

traffic. If RAM Table Requests are used exclusively, a means

should be established to determine the freshness of the data

retrieved.

FIFO BUFFER REQUEST

This message is transmitted from the Host to retrieve the most recently updated message from the BIC-II

RAM Table, via the BIC-II FIFO Buffer.

Data ASCII Example

Field Character Description

SOM STX start of message

BIC-II I.D. 1 BIC-II #1 (e.g.) (range = 1 to 8)

MT 21 retrieve data via the FIFO buffer

EOM CR end of message

The host will receive a product message in response to this request. (Refer to Product Messages).

If the FIFO Buffer is empty, the FIFO Buffer Request message is returned to the host unchanged.

FIFO Buffer Requests may be used to reduce message traffic

once data has been retrieved for all points using RAM Table

Requests. Monitor the time between the FIFO Buffer

Response messages to verify continued communication

activity between the Milltronics product and the BIC-II. If the

FIFO empty response is not received regularly, RAM Table

Requests must be used exclusively.

PROGRAM

TIP

PROGRAM

TIP

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Milltronics CVCC Manuel d'instructions Page 27