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Spectrum Controls 1756sc-OF8H Series A User Manual

Page 101

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Chapter 7: HART Channel Configuration, Data, and Status

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receiving Command 0, but for simplicity, we'll track update of the
device information as a whole.

• All other conditioned not generating INITIATE.

After the pass-through response is sent with a valid handle and a response
value indicating (33) INITIATE, the user can retrieve the data associated
with the handle using the following command message.

Table 7.14 (HART Pass-Through Command Complete Query)

HART pass through command complete query - command message packet structure

Field

Value

Definition

Unconnected Message Header
HART Channel Number

0x00 – 0x07 (1 byte)

Module input channel number for HART
command

Command Number

0x0C (1 byte)

The command number

Handle (1

byte)

1-255

The handle from command request reply

If the data associated with the handle is not yet available, or invalid, the
following reply message will be returned.

Table 7.15 (HART Pass-Through Command Complete Query Reply)

HART pass through command complete query - reply packet structure
Field

Value

Definition

Unconnected Message Header
HART Channel Number

0x00 – 0x07 (1 byte)

Module input channel

number for HART

command

Status (1

byte)

34 = RUNNING

35 = DEAD (bad request)

Command status

Count

(1 byte)

Length of Handle +
HART Response Data in

bytes (if Success)

Handle

(1 byte)

The handle from

command complete query

When data associated with the buffer becomes available, meaning a
"success" response, the reply will be formatted as follows:

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