Despatch Protocol 3 Modbus Communications - Manual (Page 41)

Modbus Programming Manual A DDRESS 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 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 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 00 00 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 A/R
CRC High Byte A/R A/R
CRC Low Byte A/R 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 A/R The ID address of the instrument.
Function Code 23 17 Requires the multi read/write function.
Read Start Address High Byte 32 20
Read Start Address Low Byte 06 06
Read Quantity Of Registers High 00 00
Read Quantity Of Registers Low 01 01
Write Start Address High 32 20
Write Start Address Low 06 06
Write Quantity Of Registers High 00 00
Write Quantity Of Registers Low 12 0C
Byte Count 24 18
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 83 53