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4-14 Point IO™ 2/4 Channel Analog HART Module

User’s Manual Pub. 0300257-01 Rev. A

4.3.4 Flush Queue

The Flush Queue message can be sent to have the IExCH module discard any pending

HART replies awaiting a query command. These replies are automatically discarded

once the handle timeout period has expired. The handle timeout period is defined in the

module configuration. The default value assigned by the AOP is 20 seconds. Unless you

need to discard the replies faster than 20 seconds, you won't need to use this Flush Queue

command.

The following table describes the class, service code and instances required to send the

Flush Queue message.

Table 4-18 (Flush Queue)

Unconnected Message

Field Value Definition

Message Type “CIP Generic”

Service Code 0x50 Flush Queues

Class Name 0x035D HART Object

Instance 0-3

0 = All Channels

1-4 = Single Channel (0-3)

All channels at once or a single channel

Object Attribute None, leave this field blank

Request Size 0 No Request Data

Reply Size 0 Number of Data bytes returned

4.3.5 Suspend HART Communication

The “suspend HART communication" message, will temporarily suspend all HART

communication on one or more channels for up to 3 minutes. HART communication will

resume automatically under the following conditions:

• After 3 minutes

• If the HART configuration changes during the three minute timeout period

• If the “resume HART communication” message is issued.

The following table describes the class, service code and instances required to send the

Suspend HART Communication message.

Table 4-19 (Suspend HART Communication)

Unconnected Message

Field Value Definition

Message Type “CIP Generic”

Service Code 0x51 Suspend HART

Class Name 0x035D HART Object

Instance 0-3

0 = All Channels

1-4 = Single Channel

All channels suspended or a single channel

Object Attribute None, leave this field blank

Request Size 0 No Request Data

Reply Size 2 Number of Data bytes returned

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 83 84

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