Honeywell UDC 2300 User manual

Sensing and Control
UDC2300
Universal Digital Controller
RS422/485 ASCII Communications Option
Product Manual
Doc. No.: 51-52-25-85
Release: A
Last Revision Date: 10/00

ii RS422/485 ASCII Communications Option Product Manual 10/00
Copyright, Notices, and Trademarks
Printed in U.S.A. – © Copyright 2000 by Honeywell
Rev. A – October, 2000
WARRANTY/REMEDY
Honeywell warrants goods of its manufacture as being free of defective materials
and faulty workmanship. Contact your local sales office for warranty information. If
warranted goods are returned to Honeywell during the period of coverage,
Honeywell will repair or replace without charge those items it finds defective. The
foregoing is Buyer’s sole remedy and is in lieu of all other warranties,
expressed or implied, including those of merchantability and fitness for a
particular purpose. Specifications may change without notice. The information
we supply is believed to be accurate and reliable as of this printing. However, we
assume no responsibility for its use.
While we provide application assistance personally, through our literature and the
Honeywell web site, it is up to the customer to determine the suitability of the
product in the application.
This document was prepared using Information Mapping®methodologies and
formatting principles.
Sensing and Control
Honeywell
11 West Spring Street
Freeport, Illinois 61032
UDC2300 is a U.S. trademark of Honeywell
Information Mapping®is a registered trademark of Information Mapping, Inc.

10/00 RS422/485 ASCII Communications Option Product Manual iii
About This Publication
The UDC manual for RS422/485 ASCII communications option contains the following sections:
Section 1 – Overview
Section 2 – Installation
Section 3 – Establishing Communications
Section 4 – Read and Write Operations
Section 5 – Reading, Writing, and Overriding Parameters on UDC2300
Universal/Digital Controllers
Section 6 – Operating the Controller with Communications Option
Section 7 – ASCII Conversion Table
Section 8 – Cable Specifications
Communication between your computer and the UDC Controller is accomplished for one piece of
information (parameter) at a time. Each parameter has an associated identifying code.
The Identifying Code and Format Code will be listed along with information pertaining to that parameter.
The identifying codes are grouped in the same order as they appear in the controller configuration prompts.
Contacts
World Wide Web
The following lists Honeywell’s World Wide Web sites that will be of interest to our customers.
Honeywell Organization WWW Address (URL)
Corporate http://www.honeywell.com
Sensing and Control http://www.honeywell.com/sensing
International http://www.honeywell.com/Business/global.asp
Telephone
Contact us by telephone at the numbers listed below.
Organization Phone Number
United States and
Canada Honeywell 1-800-423-9883 Tech. Support 1-888-423-9883 Q&A Faxback
(TACFACS)
1-800-525-7439 Service
Asia Pacific Honeywell Asia Pacific
Hong Kong (852) 2829-8298
Europe Honeywell PACE, Brussels, Belgium [32-2] 728-2111
Latin America Honeywell, Sunrise, Florida U.S.A. [phone]

iv RS422/485 ASCII Communications Option Product Manual 10/00
Symbol Definitions
The following table lists those symbols that may be used in this document to denote certain conditions.
Symbol Definition
This DANGER symbol indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
This WARNING symbol indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.
This CAUTION symbol may be present on Control Product instrumentation and
literature. If present on a product, the user must consult the appropriate part of the
accompanying product literature for more information.
This CAUTION symbol indicates a potentially hazardous situation, which, if not
avoided, may result in property damage.
WARNING
PERSONAL INJURY: Risk of electrical shock. This symbol warns the user of a
potential shock hazard where HAZARDOUS LIVE voltages greater than 30 Vrms,
42.4 Vpeak, or 60 Vdc may be accessible. Failure to comply with these
instructions could result in death or serious injury.
ATTENTION, Electrostatic Discharge (ESD) hazards. Observe precautions for
handling electrostatic sensitive devices
Protective Earth (PE) terminal. Provided for connection of the protective earth (green
or green/yellow) supply system conductor.
Functional earth terminal. Used for non-safety purposes such as noise immunity
improvement. NOTE: This connection shall be bonded to protective earth at the
source of supply in accordance with national local electrical code requirements.
Earth Ground. Functional earth connection. NOTE: This connection shall be bonded
to Protective earth at the source of supply in accordance with national and local
electrical code requirements.
Chassis Ground. Identifies a connection to the chassis or frame of the equipment
shall be bonded to Protective Earth at the source of supply in accordance with
national and local electrical code requirements.
Earth Ground. Functional earth connection. NOTE: This connection shall be bonded
to Protective earth at the source of supply in accordance with national and local
electrical code requirements.
Chassis Ground. Identifies a connection to the chassis or frame of the equipment
shall be bonded to Protective Earth at the source of supply in accordance with
national and local electrical code requirements.

10/00 RS422/485 ASCII Communications Option Product Manual v
Contents
SECTION 1 –OVERVIEW.................................................................................................. 1
1.1 Introduction................................................................................................... 1
1.2 Message Exchange Protocols......................................................................2
1.3 Field Upgrade...............................................................................................3
SECTION 2 –INSTALLATION........................................................................................... 5
2.1 Introduction................................................................................................... 5
2.2 RS232 to RS485 Converters........................................................................6
2.3 Using a Black Box Converter........................................................................7
2.4 Using a Westermo Converter....................................................................... 9
2.5 Wiring Diagrams.........................................................................................11
SECTION 3 –ESTABLISHING COMMUNICATIONS AND TESTING............................ 13
3.1 Preparing the Controller for Communications ............................................ 13
3.2 Programming Your Computer .................................................................... 18
3.3 Message Exchange.................................................................................... 19
3.4 Request Messages..................................................................................... 20
3.5 Response Messages.................................................................................. 23
3.6 Status Codes..............................................................................................25
3.7 Checksum Protocol (for Data Security)......................................................27
3.8 Shed........................................................................................................... 33
3.9 Loopback....................................................................................................34
3.10 Recovering from Communications Failures................................................36
SECTION 4 –READ AND WRITE OPERATIONS........................................................... 39
4.1 Read Operations........................................................................................39
4.2 Read Analog Parameters...........................................................................40
4.3 Read Digital Parameters ............................................................................ 43
4.4 Write Operations ........................................................................................45
4.5 Write Analog Parameters........................................................................... 46
4.6 Write Digital Parameters ............................................................................50
SECTION 5 –READ, WRITE AND OVERRIDE PARAMETERS ON UDC2300
PROCESS CONTROLLERS ..................................................................... 53
5.1 Overview ....................................................................................................53
5.2 Reading Control Data –UDC2300............................................................. 55
5.3 Read Options Status –UDC2300 .............................................................. 56
5.4 Miscellaneous Read Only’s –UDC2300 .................................................... 57
5.5 Setpoints –UDC2300.................................................................................59
5.6 Using a Computer Setpoint (Overriding Controller Setpoint) –UDC2300.. 60
5.7 PV or Setpoint Override Selections –UDC2300........................................ 62
5.8 Reading or Changing the Output –UDC2300............................................63
5.9 Local Setpoint/PID Selection/Setpoint Ramp Status –UDC2300.............. 64
5.10 Configuration Parameters –UDC2300....................................................... 67

vi RS422/485 ASCII Communications Option Product Manual 10/00
SECTION 6 –OPERATING THE CONTROLLER WITH COMMUNICATIONS OPTION85
6.1 Operation....................................................................................................85
SECTION 7 –ASCII CONVERSION TABLE....................................................................87
7.1 Overview.....................................................................................................87
SECTION 8 –CABLE SPECIFICATIONS........................................................................89
8.1 Introduction.................................................................................................89

10/00 RS422/485 ASCII Communications Option Product Manual vii
Figures
Figure 2-1 Black Box Converter Wiring Connections..................................................... 8
Figure 2-2 Recommended Switch Settings for Westermo Converter..........................10
Figure 2-3 Westermo Converter Wiring Connections.................................................. 10
Figure 2-4 UDC2300 Connections...............................................................................11
Figure 3-1 Message Exchanges..................................................................................19
Figure 3-2 Request Message Fields............................................................................ 20
Figure 3-3 Response Message Fields Information...................................................... 23
Figure 3-4 Request Format for Checksum Protocol....................................................27
Figure 3-5 Example of Checksum Calculation............................................................. 29
Figure 3-6 Using Checksum Protocol.......................................................................... 30
Figure 3-7 Success Response Message Fields........................................................... 31
Figure 3-8 Failure Response Message Fields............................................................. 32
Figure 3-9 Lost Messages........................................................................................... 36
Figure 3-10 Timing a Message Exchange and Checking for a Response.....................37
Figure 4-1 Read Analog Parameter Message Exchange ............................................ 42
Figure 4-2 Read Digital Parameter Message Exchange.............................................. 44
Figure 4-3 Write Analog Parameter Message Exchange Example..............................49
Figure 4-4 Write Digital Parameter Message Exchange Example...............................52
Figure 5-1 Option Status Information........................................................................... 56
Figure 5-2 I.D. Code 250 Indications...........................................................................65

viii RS422/485 ASCII Communications Option Product Manual 10/00
Tables
Table 1-1 Rules and Regulations for Configuration Protocol........................................2
Table 2-1 Converters ....................................................................................................6
Table 2-2 Black Box Converter Wiring Connections Procedure ...................................7
Table 2-3 Terminal Connections for Black Box Converters..........................................8
Table 2-4 Westermo Converter Configuration and Wiring Procedure...........................9
Table 2-5 Terminal Connections for Westermo Converters........................................10
Table 3-1 Communications Parameters......................................................................13
Table 3-2 Controller Procedure for Communication Parameters................................16
Table 3-3 Programming Statements...........................................................................18
Table 3-4 Request Message Fields Definitions...........................................................21
Table 3-5 Response Message Fields Definitions........................................................24
Table 3-6 Request Message Status Codes ................................................................25
Table 3-7 UDC Status Codes......................................................................................26
Table 3-8 Calculating the Checksum Procedure.........................................................28
Table 3-9 Example of Loopback Request Message ...................................................34
Table 3-10 Example of Loopback Response Message.................................................35
Table 3-11 Programming Example ...............................................................................35
Table 4-1 Analog Parameter Request Format............................................................40
Table 4-2 Analog Parameter Response Format .........................................................41
Table 4-3 Digital Parameter Request Format .............................................................43
Table 4-4 Digital Parameter Response Format...........................................................44
Table 4-5 Write Message Exchange Steps.................................................................45
Table 4-6 Write Request Format for Analog I.D. Codes .............................................46
Table 4-7 Busy Response...........................................................................................47
Table 4-8 Ready Requests .........................................................................................47
Table 4-9 Is Ready Response.....................................................................................48
Table 4-10 Write Request Format for Digital I.D. Codes...............................................50
Table 4-11 Busy Response...........................................................................................51
Table 4-12 Ready Request...........................................................................................51
Table 4-13 Is Ready Response.....................................................................................51
Table 5-1 Control Data Parameters............................................................................55
Table 5-2 Option Status..............................................................................................56
Table 5-3 Miscellaneous Read Only’s.........................................................................57
Table 5-4 Error Status Definitions...............................................................................58
Table 5-5 Setpoint Code Selections............................................................................59
Table 5-6 Setpoint Associated Parameters.................................................................59
Table 5-7 Computer Setpoint Selection......................................................................60
Table 5-8 Computer Setpoint Associated Parameters................................................61
Table 5-9 PV or Setpoint Override Selections ............................................................62
Table 5-10 Reading or Changing the Output................................................................63
Table 5-11 Associated Output Codes...........................................................................63
Table 5-12 LSP/PID Set Selection and Setpoint Ramp Status.....................................64
Table 5-13 I.D. Code 250 Writes...................................................................................66
Table 5-14 Setup Group –Timer ..................................................................................68
Table 5-15 Setup Group –Tuning.................................................................................68
Table 5-16 Setup Group –Setpoint Ramp/Rate Program ............................................70
Table 5-17 Setup Group –Adaptive Tune ....................................................................72
Table 5-18 Setup Group –Algorithm ............................................................................73
Table 5-19 Setup Group –Input 1.................................................................................74
Table 5-20 Setup Group –Input 2.................................................................................78
Table 5-21 Setup Group –Control................................................................................80

10/00 RS422/485 ASCII Communications Option Product Manual ix
Table 5-22 Setup Group –Communications ................................................................ 82
Table 5-23 Setup Group –Alarms................................................................................ 83
Table 6-1 Emergency Manual Procedure................................................................... 85
Table 7-1 ASCII Character Codes..............................................................................87
Table 7-2 Hexadecimal to Binary................................................................................ 88
Table 8-1 Cable Specifications................................................................................... 89

x RS422/485 ASCII Communications Option Product Manual 10/00
Parameters
COMSTA ............................................................................................ Communication State
ComADD..........................................................................Communication Address (Loop 1)
SHDTIM............................................................................................................... Shed Time
PARITY.........................................................................................................................Parity
BAUD RATE...................................................................................Baud Rate (bits/second)
SDMODE............................................................... Controller Shed Mode and Output Level
SHD SP ............................................................................................... Shed Setpoint Recall
TX DLY........................................................................................Transmission Delay Timer
UNITS..................................................................................................Communication Units
CSRATIO..................................................................................Commun. SP Ratio (Loop 1)
CSP BI.......................................................................................Commun. SP Bias (Loop 1)
References
Publication
Title Publication Number
UDC2300 Controller Product Manual 51-52-25-73
UDC2300 Controller User Guide 51-52-25-83

10/00 RS422/485 ASCII Communications Option Product Manual 1
Section 1 – Overview
1.1 Introduction
The communications
option The RS422/485 Communications Option on the UDC2300 Controller
provides a serial multi-drop link whereby up to 31 UDC controllers
connect directly to a host computer.
Monitor or slave mode The UDC controller can be placed in monitor or slave by the host
computer. When monitored, the controller will send Configuration,
Tuning, and Operating parameters to the host computer. When in slave,
the controller will be switched through the communications interface
board to "Slave" operation. This means that the computer can write
configuration or tuning information into any controller on the link
including overriding of PV, the setpoint, and output.
Message exchanges The computer and the controllers talk to each other through a series of
message exchanges. There are two RS422/485 message exchange
protocols: Configuration or Loopback.

2 RS422/485 ASCII Communications Option Product Manual 10/00
1.2 Message Exchange Protocols
Configuration
protocol Table 1-1 lists the rules and regulations of configuration protocol.
Table 1-1 Rules and Regulations for Configuration Protocol
Protocol Rule
Data Type
Transactions The configuration protocol permits reading or writing of data type transactions such as PV, SP, or Output, as well
as configuration type transactions such as Tuning,
Algorithm selections, etc.
Read Read transactions can be performed in either UDC state:
Monitor or Slave.
Write Write transactions can only be performed in the Slave
mode.
Busy Following any Write message, a Busy indication is
returned.
Ready A Ready transaction is required as the next message
request to determine if the information received was
correct.
Transaction Limits In a Write transaction, only single items are permitted to
be written, however, for Read transactions, single or
multi-item parameters may be requested.
Loopback Loopback protocol is also provided for link tests. With this message
exchange you can test the Communications link between your computer
and the controllers on the link. The host computer sends a series of ASCII
characters to the desired device, and the device returns the characters it
received to the host computer.
Checksum There is an optional transaction called "Checksum" which is used to
increase security on the RS422/485 link. Used with any message
exchange, it enables both your computer and controller to detect messages
that have been interrupted by line noise.
Controller Address Each controller will have its own specific address.
Keyboard
Configuration Address, Baud Rate, and Parity are keyboard selectable as well as Shed
Time, Shed Mode, and Output Level.

10/00 RS422/485 ASCII Communications Option Product Manual 3
1.3 Field Upgrade
Adding the
communications
option
RS422/485 Communications Option can be added in the field by installing
the proper RS422/485 Printed Wiring Board Assembly.
Part number 51309831-50 1 is required to add the RS422/485
Communication option Printed Wiring Board to the UDC2300 controller.

4 RS422/485 ASCII Communications Option Product Manual 10/00

10/00 RS422/485 ASCII Communications Option Product Manual 5
Section 2 – Installation
2.1 Introduction
General The Installation section (Section 2) of the UDC Product Manual contains
information and drawings required to mount and wire the controller. Refer
to the Controller Product Manual for appropriate information regarding
the basic installation requirements.
Electrical noise
protection When installing and wiring the controller, follow the practices that
conform to all local codes and ordinances. In addition, be aware of the
precautions you should take to avoid electrical noise.
Electrical noise is unwanted electrical signals that provide undesirable
effects. Digital equipment is especially sensitive to the effects of electrical
noise. The controller has built-in circuits to reduce the effects of this
noise.
For information concerning further reduction of electrical noise, refer to
51-52-05-01, "How to Apply Digital Instrumentation in Severe Electrical
Noise Environments."
What’s in this section This section contains the following information:
Topic See Page
2.1 Introduction
General
Electrical Noise Protection
5
5
5
2.2 RS232 to RS485 Converters 6
2.3 Using a Black Box Converter
Wiring the Black Box converter and the link
Wiring connections
Link devices terminal connections
7
7
8
8
2.4 Using a Westermo Converter
Wiring the Westermo converter and the link
Configuring the Westermo converter and the link
Wiring connections
Link devices terminal connections
9
9
10
10
10
2.5 Wiring Diagrams 11

6 RS422/485 ASCII Communications Option Product Manual 10/00
2.2 RS232 to RS485 Converters
Overview Up to 31 UDC2300 controllers with an RS485 communications option
can be connected to your computer by installing a Black Box or Westermo
RS232 to RS485 converter between the RS232 port on your computer and
the devices on the RS485 link.
Converters Table 2-1 lists the specific information needed to procure either of these
converters.
Table 2-1 Converters
Arrangement Description
Black Box
Converter Using the RS232 port and a Black Box RS232 to RS485 converter installed between the RS232 port and the first
device on the link.
This converter is available from . . .
Black Box Corp
Pittsburgh, PA
Model
IC109A - Stand alone RS232 to RS485/422 converter
with opto-isolation
Westermo
Converter
(Europe)
Using the RS232 port and a Westermo RS232 to RS485
converter installed between the RS232 port and the first
device on the link.
The Westermo converter can be ordered from a
Honeywell sales office, Part Number 46210088-001.
A 2 meter shielded cable with Female/Male DB9/DB25
connectors for use between the PC communication port
and the Westermo box is also available, Part Number
46210061-002

10/00 RS422/485 ASCII Communications Option Product Manual 7
2.3 Using a Black Box Converter
Wiring the Black Box
converter and the link Figure 2-1 shows the wiring diagram and terminal connections for wiring
the RS232 to RS485 Black Box converter.
Follow the procedure in Table 2-2 to wire the Black Box converter.
Table 2-3 shows the terminal designation for the devices on the link.
Table 2-2 Black Box Converter Wiring Connections Procedure
Step Action
1Install an appropriate Serial Communication Connector between the
Computer serial port and the RS232 input connector of the Black Box
converter. See the Black Box data sheet for the required
interfacing signals.
2Connect one wire to terminal 2 (–).
3Connect other wire to terminal 1 (+).
4Connect a 120 ohm resistor across 1 and 2.
5Set the jumpers on the Black Box converter Printed Circuit Board as
follows: JUMPER SETTING
XW1A DCE
W8 B-C (2-wire)
W15 B-C (Data Enabled)
W5 A-B (RTS/CTS delay - normal)
W9 C (0 msec)
W17 C (2 msec)
W16 B (0.1 msec)
S1 OUT (Normal)
S2 ON (RS485 Receiver Terminated)
S3 ON (Line Bias On)
6Create a chain of up to 31 devices by connecting them with shielded
twisted pair wiring (Belden 9271 Twinax or equivalent) to a maximum
total length of 4000 feet (1250 meters).
(See Section 8—Cable Specifications.)
REFER TO TABLE 2-3 FOR TERMINAL DESIGNATIONS OF THE
DEVICES ON THE LINK

8 RS422/485 ASCII Communications Option Product Manual 10/00
2.3 Using a Black Box Converter, Continued
Black Box wiring
connections Figure 2-1 shows the wiring for the Black Box converter and the devices
on the link.
Figure 2-1 Black Box Converter Wiring Connections
22937A
Computer
RS232
output
Black Box
Converter
+
–1ST Device
on Link
To other devices on link
Maximum 31 addresses
120 ohm resistor between A and B
on last device on link
Shield
120 Ohm
Resistor
3
2
1
Link devices terminal
connections Table 2-3 lists the terminal connections between the Black Box converter
and the devices on the communication link.
Table 2-3 Terminal Connections for Black Box Converters
BLACK BOX UDC2300
214
113

10/00 RS422/485 ASCII Communications Option Product Manual 9
2.4 Using a Westermo Converter
Wiring the Westermo
converter and the link Figure 2-2 shows the recommended switch setting for the WESTERMO
converter.
Figure 2-3 shows the wiring diagram and terminal connections for wiring
the RS485 Westermo converter.
Follow the procedure in Table 2-4 to configure and wire the Westermo
converter.
Table 2-5 shows the terminal designation for the devices on the link.
Table 2-4 Westermo Converter Configuration and Wiring Procedure
Step Action
1Install an appropriate Serial Communication Connector between the
Computer serial port and the RS232 input connector of the Westermo
converter. See the Westermo data sheet for the required interfacing
signals.
2Configure the switch settings on the Westermo converter as shown in
Figure 2-6.
3Connect the shield to terminal 5. See Figure 2-3.
4Connect one wire to terminal 3 (–).
5Connect other wire to terminal 4 (+).
6Connect a 120 ohm resistor across terminals 3 and 4.
7Create a chain of up to 31 Devices by connecting them with shielded
twisted pair wiring (Belden 9271 Twinax or equivalent) to a maximum
total length of 4000 feet (1250 meters).
(See Section 8—Cable Specifications.)
REFER TO TABLE 2-5 FOR TERMINAL DESIGNATIONS OF THE
DEVICES ON THE LINK

10 RS422/485 ASCII Communications Option Product Manual 10/00
2.4 Using a Westermo Converter, Continued
Configuring the
WESTERMO
Converter
Figure 2-2 shows the recommended switch settings for the WESTERMO
converter.
Figure 2-2 Recommended Switch Settings for Westermo Converter
1
2
34
561
234
5
6
230
12345
S1 S3 S2
ON
OFF
Power
Supply Line Connection V 24/RS-232-C CONNECTION
ON
OFF
22933
Westermo wiring
connections Figure 2-3 shows the wiring for the Westermo converter and the devices
on the link.
Figure 2-3 Westermo Converter Wiring Connections
22937
1
2
3
4
Computer
RS232
output
Westermo
Converter
+
–1ST Device
on Link
To other devices on
Maximum 31
120 ohm resistor between A
on last device on
Twisted pair shield –connect
wire with supplied crimp
Shield
120 Ohm
Resistor
Link devices terminal
connections Table 2-5 shows the terminal connections between the Westermo
converter and the devices on the communication link.
Table 2-5 Terminal Connections for Westermo Converters
Westermo
Line Connections UDC2300
314
413