Despatch RFD1-42 -2E with Protocol 3 - Manual (Page 17)

RFD1-42-2E Oven Owner’s Manual T HEORY OF O PERATION
Version 1 17
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.
product does not have a critical high temperature limit, the High Limit setpoint should be set 5 to
15 degrees higher than the maximum programmed setpoint at which the oven will operate.
The Protocol 3 controller provides three primary operating modes:

Manual: Oven operates continuously at a fixed temperature until turned off.

Timer: Oven operates at a fixed temperature for a user-selected time period, and then
automatically turns off.

Profile: Temperatures increase or decrease as defined by 255 segments that can be allocated
to 64 ramp and soak profiles. The profiles can be linked to provide additional temperature
combinations.
Review the Protocol 3 Controller Owner’s Manual for more information.
3.3.1. Optional High Limit Audible Alarm
High Limit audible and visual alarm is a red light and small alarm horn located on the front of the
control panel. The alarm is sounded if a High Limit condition occurs. A switch is provided to
silence the alarm. This alarm has a range of 80dB at 2 ft (0.6 m).
3.3.2. Optional Modbus Communications Hardware
RS485 Modbus communications are wired from the Protocol 3 controller to the DB9 connector
on the side of the oven. A programming manual is included which lists all the messages
recognized by the Protocol 3 controller. This manual is intended for those who will write their
own software. An RS232 to RS485 converter is required between the PC and a single oven. The
manual can also be used with Despatch Protocol Manager software.
Figure 5. Protocol 3 Operator Interface.