Nidec H300 - List of Metasys Commands Supported; List of Metasys Commands NOT Supported; Change of State Support; Selecting Points for COS Polling

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192 HVAC Drive H300

Issue Number: 3

Table 10-45

10.5.7 List of Metasys Commands Supported

Table 10-46 List of Metasys commands supported

Table 10-47 List of Metasys commands NOT supported

Change of State Support

The H300 Metasys Protocol handler permits Change-of-State (COS) queries. This allows the network to poll a Metasys node (H300) to determine

which points have changed value since the last query. The response to such a poll is a list of those points that have changed, including the region

number, point number, status and current value. It is possible that the COS response contains multiple points that have changed. The report that a

point has changed state is only given once, future COS polls will go unanswered until the point actually changes state again. This is a great

convenience to the Metasys user in that the network doesn't have to continually poll a large number of points to detect a change; rather a list of these

points is sent to the H300 node and polling queries will result in just the specified points being checked for change. The results are culled into a single

response message. Best of all, if nothing happened since the last poll, there is no response (just a short acknowledgement).

Selecting Points for COS Polling

Analog Input, Binary Input, Analog Output and Binary Output Points all can be selected for COS polling. The user must set the COS_Enable bit

beforehand. For example, to place the "Drive Healthy" Pr 10.001 into the COS polling list, we just need to write to its configuration byte and set the

COS_Enable bit.

Table 10-48 Binary input- object configuration byte

Set COS Enable bit to place Binary Input, Point 2 (Drive Healthy) into the COS polling list.

Point Parameter Description

0 N/A Not implemented

Command

Synch Time Command Write Binary Output Command

Poll Without Ack Message Write Internal Parameter Command

Read Analog Input Command Override Analog Input Command

Read Binary Input Command Override Binary Input Command

Read Analog Output Command Override Analog Output Command

Read Binary Output Command Override Binary Output Command