Despatch Protocol 3 Modbus Communications - Manual (Page 46)

A DDRESS LIST Modbus Programming Manual
46 Version 2
Copyright © 2012 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Command Response Name Two Byte Response Description
type defined
Auto Hold Type Invalid 0xF0 0x0E The auto hold type is not recognized
Auto Hold Value Invalid 0xF0 0x0F The auto hold value is not within input span
Events Value Invalid 0xF0 0x10 The events are not within range
No Segments Remaining 0xF0 0x11 There are no more segments available
Write Length Invalid 0xF0 0x12 The number of parameters to be written are invalid for
the function requested
Segment Setpoint Clamped 0xF0 0x13 The setpoint value entered was out of bounds. It has
been clamped within the units setpoint limits.
2.9.5.10. Reading a Profile Header (Command Code RP)
Read A Profile Header - 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 Byte 00 00
Read Quantity Of Registers Low Byte 18 12
Write Start Address High Byte 32 20
Write Start Address Low Byte 06 06
Write Quantity Of Registers High Byte 00 00
Write Quantity Of Registers Low Byte 02 02
Byte Count 04 04
Command Code High Byte 82 52
Command Code Low Byte 80 50
Profile Number High Byte A/R A/R Number of the profile to read
Profile Number Low Byte A/R A/R
CRC High Byte A/R A/R
CRC Low Byte A/R A/R
The instrument replies to the Read A Profile Header request as follows:
Read Profile Header - Response (from instrument)
Field Name Data Comments
(Dec) (Hex)
Unit Address A/R A/R The ID address of the instrument
Function Code 23 17 The multi read/write function
Byte Count 36 24
Profile Name Character 1 A/R A/R
The ASCII codes equivalent to each of the
16 characters of the profile name, e.g. :
A = 65dec / 0x41, B = 66dec / 0x42 etc
a = 97dec / 0x61, b = 98dec / 0x62
The space character (32dec / 0x20hex) is
Profile Name Character 2 A/R A/R
Profile Name Character 3 A/R A/R
Profile Name Character 4 A/R A/R
Profile Name Character 5 A/R A/R
Profile Name Character 6 A/R A/R