Despatch Protocol 3 Modbus Communications Manuel d'utilisateur télécharger pdf (Page 41)

Modbus Programming Manual ADDRESS LIST

Version 2 41

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Creating Segments - Request (to instrument)

Field Name

Data

Comments

(Dec)

(Hex)

Segment Info A (Byte 1 - Low)

Segment Info B (Byte 4 - High)

Floating point number

The meaning of the data contained in

Segment Info B depends on the type of

segment it relates to. See section 12.5.5.

Segment Info B (Byte 3)

Segment Info B (Byte 2)

Segment Info B (Byte 1 - Low)

Auto Hold Type High Byte

A/R

0 = Auto-Hold Off, 1 = Hold above SP,

2 = Hold below SP,3 - Hold above and

below SP

Auto Hold Type Low Byte

A/R

Auto Hold Value (Byte 4 - High)

Floating point number

Auto Hold Value (Byte 3)

Auto Hold Value (Byte 2)

Auto Hold Value (Byte 1 - Low)

Events High Byte

The status of the five events are defined by

the lowest 5 bits of the low byte. A bit value

of 1 signifies the event is on.

Bit 0 = event 1, bit 1 = event 2, bit 3 = event

4 and bit 5 = event 4.

Events Low Byte

A/R

CRC High Byte

A/R

CRC Low Byte

A/R

The instrument replies to this message with an Edit Response Message Section 2.9.5.9.

2.9.5.4. Editing or Inserting a Segment (Command Codes IS and ES)

The Insert Segment command is used to add segments to an existing profile (one that already has

an end segment). This inserts a new segment at the position specified. The Edit Segment

command is used to alter segments of an existing profile. The segment number is in relation to the

profile number, e.g. to edit or insert a segment at position 3 of profile 1 the segment number will

be 3, and to edit or insert a segment at position 3 of profile 6 the segment number will also be 3.

Editing or Inserting Segments - Request (to instrument)

Field Name

Data

Comments

(Dec)

(Hex)

Unit Address

A/R

The ID address of the instrument.

Function Code

Requires the multi read/write function.

Read Start Address High Byte

Read Start Address Low Byte

Read Quantity Of Registers High

Read Quantity Of Registers Low

Write Start Address High

Write Start Address Low

Write Quantity Of Registers High

Write Quantity Of Registers Low

Byte Count

Command Code High Byte

73 or 69

49 or 45

Insert Segment (IS) = 73dec / 0x4953hex

Edit A Segment (ES) = 69dec / 0x4553hex

Command Code Low Byte

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 51 52

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Despatch Protocol 3 Modbus Communications Manuel d'utilisateur Page 41

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