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Spectrum Controls 1756sc-OF8H Series A User Manual

Page 95

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Chapter 7: HART Channel Configuration, Data, and Status

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Table 7.9 (Response When Device Information Is Available)

HART Get Device Information - reply packet structure

Field

Value

Definition

Unconnected Message Header
HART Channel Number

0x00 – 0x07 (1 byte)

Module input channel number for

HART command

Status

00 = SUCCESS

Command status

Count

(1 byte)

Number of data bytes to following.

HARTManufacturerIDCode

(1 byte)

CMD#0, Byte 1

HARTDeviceTypeCode

(1 byte)

CMD#0, Byte 2

HARTPreambles

(1 byte)

CMD#0, Byte 3

HARTUnivCmdCode

(1 byte)

CMD#0, Byte 4

HARTTransSpecRev

(1 byte)

CMD#0, Byte 5

HARTSoftwareRevision

(1 byte)

CMD#0, Byte 6

HARTHardwareRevision

(1 byte)

CMD#0, Byte 7

HARTFlags

(1 byte)

CMD#0, Byte 8

HARTDeviceID

(3 bytes) Device serial number

CMD#0, Bytes 9-11

HARTTag

(8 bytes unpacked ASCII) CMD#13, Bytes 0-5

HARTDescriptor

(16 bytes unpacked ASCII)

CMD#13, Bytes 6-17

HARTDate

(3 bytes)

CMD#13, Bytes 18-20

HARTFinalAssemblyNumber

(3 bytes)

CMD#16, Bytes 0-2

HARTMessage

(32 bytes unpacked ASCII)

CMD#12, Bytes 0-23

HARTPVCode

(1 byte)

CMD#50, Bytes 0

HARTSVCode

(1 byte)

CMD#50, Bytes 1

HARTTVCode

(1 byte)

CMD#50, Bytes 2

HARTFVCode

(1 byte)

CMD#50, Bytes 3

HARTPVUnits

(1 byte)

CMD#3, Byte 4

HARTSVUnits

(1 byte)

CMD#3, Byte 9

0 if not present

HARTTVUnits

(1 byte)

CMD#3, Byte 14

0 if not present

HARTFVUnits

(1 byte)

CMD#3, Byte 19

0 if not present

HARTPVLowerRange

(4 bytes – Floating Point Value)

CMD#15, Bytes 3-6

HARTPVUpperRange

(4 bytes – Floating Point Value)

CMD#15, Bytes 7-10

The command status, the second byte in the reply packet for the module
specific command, can return three different responses, SUCCESS,
RUNNING and DEAD. These responses echo the state of the module at
the time the command is sent. The conditions for each response are as
follows:

SUCCESS will be sent back when all of the following conditions are
met:

• Command and HART Channel number are both valid.

• HART channel device information is available.

RUNNING will be sent back when all of the following conditions
are met:

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