Despatch Protocol 3 Modbus Communications - Manual (Page 49)

Modbus Programming Manual A DDRESS LIST
Version 2 49
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Read A Segment - Response (from instrument)
Field Name Data Comments
(Dec) (Hex)
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
Segment Data
The Segment Data is included in the response to a Read Segment request. It is provided in two
parts (Segment Info A and B).
The meaning of the data contained in Segment Info A and B depends on the type of segment it
relates to. Null is shown for unused data, this can be any value.
Segment Type Segment Info Description
A B
Ramp Time Time (in seconds) Target setpoint Ramp to the target setpoint “B” in the time “A”
Ramp Rate Ramp rate Target setpoint Ramp to the target setpoint “B” at the ramp rate “A”
Step Null Target setpoint Step to a target setpoint “B”
Dwell Dwell time (in seconds) Null Stay at the current setpoint for a period of time “A”
Hold 0 = Operator Null Wait for the operator to release the hold
1 = Time of day Start Time Wait until time of the day “B” in seconds since
midnight.
Loop Number of times to
repeat 1 to 9999 Segment number Loop to the specified segment number “B” from this
point. Repeat this “A” times. Only segments below the
current segment can be entered. Two loops must not
cross each other.
Join Null Profile number On completion of this profile jump run profile “B”
End 0 = Control off Null Turn off all control outputs.
1 = Maintain profile
setpoint Null Stay at the final setpoint of the profile
2 = Control off with
events Null Turn off the outputs but maintain the events.
Repeat
Sequence Then
End 0 = Outputs off Number of times to
repeat sequence Repeat the profile sequence number “B” times, then
turn off the control outputs
1 = Maintain profile
setpoint Repeat the profile sequence number “B” times, then
hold the last profile setpoint.
2 = Control off with
events Turn off the outputs but maintain the events.
2.9.5.12. Read a profile Name (Command Code PN)
This command returns the name of the profile defined by the profile number requested.