Omega Engineering hot point CL900A Series User manual

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User’s Guide
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CL900A/CL950A SERIES
hot point®Dry Block
Probe Calibrator
TM
TM

Servicing North America:
USA: One Omega Drive, P.O. Box 4047
ISO 9001 Certified Stamford CT 06907-0047
TEL: [phone] FAX: [phone]
e-mail: [email protected]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1, Canada
TEL: [phone] FAX: [phone]
e-mail: [email protected]
For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA
Customer Service: 1-800-622-2378 / 1-800-622-BEST®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN®
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico: En Espan˜ol: [phone]-7803 e-mail: [email protected]
FAX: [phone] [email protected]
Servicing Europe:
Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands
TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [email protected]
Czech Republic: Frystatska 184, 733 01 Karviná, Czech Republic
TEL: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [email protected]
France: 11, rue Jacques Cartier, 78280 Guyancourt, France
TEL: [phone] FAX: [phone]
Toll Free in France: 0800 466 342
e-mail: [email protected]
Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 639 7678
e-mail: [email protected]
United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified Northbank, Irlam, Manchester
M44 5BD United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800-488-488
e-mail: [email protected]
OMEGAnet®Online Service Internet e-mail
www.omega.com [email protected]
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.
TM
TM
TM

Table of Contents
Section ........................................................................... Page
Section 1 Introduction .............................................................................. ... 1-1
1.1 Precautions ............................................................................. 1-1
1.2 Safety Warnings and IEC Symbols .......................................1-1
1.3General Description ............................................................... 1-2
Section 2 Installation ................................................................................... 2-1
2.1 Unpacking and Inspection ................................................... 2-1
2.2 Mounting ................................................................................ 2-2
2.3 Ambient Temperature ........................................................... 2-2
2.4 Power Connection ................................................................. 2-2
Section 3 Operation ...................................................................................... 3-1
3.1 Front Panel Controls and Indicators ................................... 3-1
3.2 Back Panel Connections ........................................................ 3-3
3.3 Changing the Temperature Setpoint ................................... 3-4
3.4 Changing the Controller Parameters .................................. 3-4
3.5 Target Plate Temperature Transition Chart ........................ 3-5
3.6 Replacing Probe Well Inserts in the CL900A ..................... 3-5
3.7 Fanning System ...................................................................... 3-6
3.8 Overhead Reset Switch .......................................................... 3-7
Section 4 Maintenance ................................................................................ 4-1
4.1 Calibration .............................................................................. 4-1
4.2 Cleaning .................................................................................. 4-1
4.2.1 Main Body ....................................................................... 4-1
4.2.2 Target Plate ..................................................................... 4-1
4.2.3 Fan and Vent Guards ..................................................... 4-1
4.3 Fuse Replacement .................................................................. 4-1
Section 5 RC232 Communications ............................................................ 5-1
Section 6 Specifications .............................................................................. 6-1
Section 7 Troubleshooting Guide ............................................................. 7-1
Section 8 Glossary of Terms Used in This Manual ................................ 8-1
Section 9 The OMEGA Family of Blackbody Calibrators .................. 9-1
i
CL900A/CL950A SERIES Table of
Contents
TM

Table of Figures
Figure Description: ......................................................... Page:
1. IEC Symbols ...............................................................................................1-1
2. Probe Well Inserts for the CL900A ......................................................... 1-2
3. CL900A Probe Well.................................................................................... 2-1
4. CL950A Probe Well ................................................................................... 2-1
5. CL950A-230 Probe Well ........................................................................... 2-1
6. Front Panel ................................................................................................. 3-1
7. Back Panel .................................................................................................. 3-3
8. Controller Menu Hierarchy Showing Factory Default Parameters
Settings ....................................................................................................... 3-4
9. Approximate Target Plate Temperature Transition Times Chart ...... 3-5
10. Removal of Probe Well Insert in CL900A ...............................................3-6
11. Connecting the CL900A to a Computer's Serial Port .......................... 4-3
ii
CL900A/CL950A SERIES
Table of
Figures

1-1
Section 1 - Introduction
Your CL900A/CL950A hot point“ Thermocouple, RTD and thermistor Probe
Calibrators have been designed for ease of use and reliability whenever you
have the need to test or calibrate temperature probes. It is important that you
read this manual completely and follow all safety precautions before operating
this instrument.
1.1 Precautions
• Follow all safety precautions and operating instructions outlined in this
manual.
• Never leave your calibrator unattended when in use.
• Keep out of reach of children.
• Never touch the probe well area when hot.
• Never place any object within 3 inches of the probe well opening when hot.
• Do not operate in flammable or explosive environments.
• Never operate with a power cord other than the one provided with your unit.
• Remove and or disconnect main power cord before attempting any
maintenance or fuse replacement.
• Do not connect and or operate this unit to a non-grounded, non-polarized
outlet or power source.
• Do not connect the serial port or reference probe port to equipment with
exposed, hazardous, live voltages.
NOTE:
There are no user serviceable parts inside your unit. Attempting to repair or service your unit
may void your warranty.
1.2 Safety Warnings and IEC Symbols
This device is marked with international safety and hazard symbols in
accordance with IEC 1010. It is important to read and follow all precautions and
instructions in this manual before operating or commissioning this device as it
contains important information relating to safety and EMC. Failure to follow all
safety precautions may result in injury and or damage to your calibrator. Use of
this device in a manner not specified by the manufacturer may impair protection
provided within the unit.
IEC symbols Description
Introduction 1
Caution, risk of electric shock

Figure 1. IEC symbols
1.3
General Description
The CL900A and CL950A are a part of a family of calibrators which allows for
calibration of thermocouples, thermisters, RTD and thermistor probes quickly
and easily with an accuracy to 0.8°C (1.5°F).
An integral RTD sensor assures high measurement accuracy and repeatability. A
built-in microprocessor-based PID digital controller assures exceptional stability.
Setpoint and actual temperature are displayed, simultaneously. Temperature can
be set in one degree increments from 22°C (40°F) above ambient temperature to
482°C (900°F).
The CL900A differs from the CL950A only with regard to the probe well. The
CL900A has a removable, single-port well insert. The CL950A has a built-in
multiport well. The CL900A is shipped with the CL906 insert (diameter=1/4",
depth=6"). The CL900A-230 is shipped with the CL906-M insert (diameter=4.5
mm, depth= 152.4 mm).
1-2
Introduction
1
Caution, refer to accompanying
documents
Caution, hot surface
230 VAC @50Hz (European Models)
115 VAC @60Hz (Domestic Models)

Introduction 1
1-3
Figure 2. Probe Well Inserts for the CL900A
As shown in Figure 1, various inserts may be ordered from OMEGA to meet
your specific probe requirements. The insert slides into the probe well of the
CL900A.
Figure 3. CL900A Probe Well
The CL950A and CL950A-230 have permanently fixed multi-port wells that
accepts 4 different probe sizes. The CL950A and CL950A-230 has 4 standard inch
holes with diameters: 1/16", 1/4"x 2, 1/8", 3/16" with 6" hole depth. The
CL950A-M and CL950A-M-230 has 4 standard metric holes with diameters: 2
mm, 3 mm, 4.5 mm, and 6 mm x 2 with 152.4 mm hole depth.
Figure 4. CL950A Probe Well Figure 5. CL950A-M Probe Well
Probe Well Inserts with "Inch Sizes" Probe Well Inserts with "Metric Sizes"
OMEGA Probe Hole Probe Hole OMEGA Probe Hole Diameter Hole
Part No. Diameter Depth Part No. Probe Depth
CL901 1/8" 4" CL901-M 2 mm 106.6 mm
CL902 1/8" 6" CL902-M 2 mm 152.4 mm
CL903 3/16" 4" CL903-M 3 mm 106.6 mm
CL904 3/16" 6" CL904-M 3 mm 152.4 mm
CL905 1/4" 4" CL905-M 4.5 mm 106.6 mm
CL906 1/4" 6" CL906-M 4.5 mm 152.4 mm
CL907 5/16" 4" CL907-M 6 mm 106.6 mm
CL908 5/16" 6" CL908-M 6 mm 152.4 mm
CL909 3/8" 4" - - -
CL910 3/8" 6" - - -
CL911 UNDRILLED 6" Max. - - -
1/4"
1/8"
1/4"
3/16"
1/16"
6 mm
3 mm
6 mm
4.5 mm
2 mm

CL900A/CL950A SERIES
1
1-4
NOTES:

2-1
Installation 2
Section 2 - Installation
2.1 Unpacking
Remove the packing list and verify that you have received all your equipment. If
you have any questions about the shipment, please call our Customer Service
Department at
1-800-622-2378 or 203-359-1660
Website: http://www.omega.com
e-mail: [email protected]
When you receive the shipment, inspect the container and equipment for any
signs of damage. Note any evidence of rough handling in transit. Immediately
report any damage to the shipping agent.
NOTE:
The carrier will not honor any damage claims unless all shipping material is saved for
inspection. After examining and removing contents, save packing material and carton in the
event reshipment is necessary.
The following items are supplied in the box: The following items are supplied in
the box:
*A probe well insert is only included with Model CL900A or CL900A-230.
2.2 Mounting
Mount the unit on a bench, table top or shelf in a horizontal position and operate
at least ten inches from any air obstructions to the fan, front panel, rear panel,
bottom and top of the unit, in an ambient environment between the specified
5°C to 38°C (40°F to 100°F).
2.3 Ambient Temperature
The CL900A/CL950A is designed to operate within an ambient temperature
range from 5°C to 38°C (40°F to 100°F). Failure to operate the unit within this
range may damage your unit. If the unit is operated in an ambient temperature
above 38°C (100°F) a thermal cutoff switch will cut off power to the heater. The
process variable (PV) will no longer approach the setpoint variable (SV). The
heaters will cool down and cease to operate. If this should occur you should
send your unit back to OMEGA for service.
Item: OMEGA Part #:
Hotpoint Calibrator(Removable single port well insert) CL900A /CL900-230
Or Or
Hotpoint Calibrator (Built-in multiport well) CL950A /CL950-230
Probe Well Insert for1/4" Probes (shipped with CL900A)* CL906
Or Or
Probe Well Insert for 4.5 MM Probes (shipped with CL900A-230) * CL906-M
User Manual M-3555
Calibration Certificate CAL-3
Power Cord 200-0028 (Domestic),
200-0107 (International)
Well Insert Removal Tool HP-0037 (CL900A only)

2.4 Power Connection
Standard (115 VAC~, 50/60 Hz models)
The CL900A/CL950A comes with a standard North American 3-prong AC
power cord. Do not use any other power cord other than the one provided. This
cord is of adequate wire gage, grounding features and has been safety tested by
the proper safety agencies.
International (230 VAC~, 50/60 Hz models)
On CL900A-230/CL950A-230 models an International style power cord with the
proper color code and approvals is provided with stripped wire ends for
connection to the proper connector used in your country or local area. The
connector is not provided.
NOTE:
• Electrical connections and wiring should be performed only by suitably trained
personnel.
• Be sure that the line voltage powering your unit does not go above or below 10% of the
rated voltages specified above.
Installation
2
2-2

3-1
Operation 3
Section 3 - Operation
3.1 Front Panel Controls and Indicators
Figure 6. Front Panel
Temperature Controller:
The temperature controller provides a separate digital display for setpoint
temperature as well as process temperature. Buttons are provided on the front
panel for configuring the controller. The CL900A/CL950A is shipped pre-
configured. The customer should not alter any parameters except for the
displayed engineering units (°F/°C).
P.I.D. Indicator:
When this light is illuminated, the unit is heating up the target plate.
NOTE:
P.I.D. Control:
Proportional, integral, derivative control ( P.I.D.) is a temperature control algorithm used in
high-end temperature controllers. The controller causes the process to attain the desired
temperature by turning the process on or off. The process may be a heater or refrigerator. As
the process temperature approaches the setpoint temperature the hot or cold process will be
pulsed to reduce the corrective measures and minimize overshooting. The controller provides
a visual representation of the process status through LED indicators. An indicator may be lit
continuously, blink or shut off entirely to indicate that the process is on, being pulsed, or off,
respectively.
CAUTION: HOT SURFACE
CAUTION: HOT SURFACE
®
Ambient + 40°F/22°C
Temperature
Range 900°F/482°CCL900A SERIES
HOT POINT®Block Calibrator
FINGER GUARD P. I. D.
INDICATOR
TEMPERATURE
CONTROLLER
700 PV
600 SV
PROBE WELL INSERT
LOCK PIN
POWER
SWITCH

Operation
3
3-2
Probe Well:
The CL900A allows for different probe well insert options, whereas the CL950A
comes with a fixed probe well which accepts 4 different probe diameters. The
probe well in both units is chassis grounded. It is critical that a power outlet
with a grounding lug be used. Never defeat the grounding conductor in any
way.
Menu Access Key:
Hold down for 3 seconds, initially, to access the programming mode. Once in the
programming mode, momentarily press this key to scroll through the menus.
Raise Key:
Momentarily press to increase the selected parameter or scroll upward in the list
of possible settings.
Lower Key:
Momentarily press to decrease the selected parameter or scroll downward in the
list of possible settings.
Mode/Enter Key:
Hold down for 3 seconds to enter the standby setup mode, initially. Once in the
program mode, viewing a parameter, use this key to save the current setting and
advance to the next parameter.

3.2 Back Panel Connections
Figure 7. Back Panel
AC Power Input:
The customer connects the power cord to the AC Power Input. Refer to Section
4.3 for information on fuse replacement.
Power Switch
The power switch has two positions, "ON and "STANDBY."
Power Switch
The power switch has two positions, “ON” and “STANDBY.”
ON STANDBY
In the "ON" mode, the entire unit is powered up. The fan will turn on
immediately when entering the "ON" mode. Once the calibrator is no longer
being used and the switch is placed in the "STANDBY" mode, the unit is
powered down except for the fan circuit. The fan will continue to run for two
hours.
WARNING:
Do not disconnect the power cord from the unit while the unit is cooling down. Do not
disconnect the power cord until the unit has completed its cool down period. Never transport
the unit while it is still hot.
Operation 3
3-3
FINGER GUARD THERMAL RESET SWITCH VENT
FAN AC MAIN POWER INLET
AND FUSE COMPARTMENT
RS232 PORT

3.3 Changing the Temperature Setpoint
The layout of the front panel is shown in Figure 2. The CL900A/CCL950A
incorporates a PID digital setpoint controller. The setpoint variable (SV) is
changed by holding in either the key or the key. The setpoint variable
will change at 3 different rates depending on how long a key is being pressed.
The minimum setpoint is 38°C (100°F), the maximum setpoint 482.2°C (900°F).
3.4 Changing the Controller Parameter Settings
The CL900A/CL950A operates at its optimum performance when left with the
factory parameter settings. The only internal parameter that the operator may
need to change is the engineering units (°F or °C). Below are two diagrams: a)
menu hierarchy with factory default settings b) programming procedure. In the
event that some parameters have accidentally been changed, use the factory
default settings shown below.
NOTE:
Changing any other parameter settings besides the engineering units will decrease the
accuracy of your calibrator.
Figure 8. Controller Menu Hierarchy Showing Factory Default Parameter Settings
WARNING:
Do not re-program the controller’s parameter settings or change the wiring inside your unit to
override the maximum setpoint value of 482.2°C (900°F).
3
3-4
Operation
3
Menu 00 Menu 01 Menu 02 Menu 03 Menu 04 Menu 05
Key Lock SETPOINT Ac.Cd = 02 Ac.Cd = 03 Ac.Cd = 04 Ac.Cd = 05
Ac.Cd
Gn.o1 113 ALr1 925 id.no 01 SnSr P
Gr.o2 ALr2 bAUd 12.o.7 Sn.00
rAtE 24 Cy.t1 01 CAL.L dEC.P
rSEt 122 Cy.t2 CAL.H FILt
H.Hys SP
.tt OFF OUt.1 Ht.P
HyS.1 L.SP.L 80 OUt.2 Air
C.HyS L.SCL CoL.t nor
HyS.2 U.SP.L 900 A1.HL HI
C.SPr H.SCL A1.Pd Pr
SPr.2 A1.OP LAt
dPnG Nl A2.HL Hl
A2.Pd Pr
A2.OP OFF
Unit F

Changing the controller’s parameter settings:
3.5 Approximate Target Plate Temperature Transition Chart
Figure 9. Approximate Target Plate Temperature Transition Times
The CL900A/CL950A heat-up and cool-down characteristics are illustrated in
Figure 8. The chart illustrates the approximate time required to make a transition
from one probe well temperature to another. First, determine the current probe
well temperature and go to the corresponding row. Next, decide the new target
plate temperature and go to the appropriate column. Note that there are X’s
along the diagonal where original and target temperatures are the same.
3.6 Replacing the Probe Well Inserts in the CL900A
As shown in Figure 1, there are several different probe well inserts available for
the CL900A/CL900A-230. The CL900A is shipped with the CL906 insert
(diameter=1/4", depth=6") and the CL900A-230 is shipped with the CL906-M
insert (diameter=4.5 mm, depth=152.4 mm). 2 operations are required to be done
at the same time to remove the probe well:
Operation 3
3-5
1. Press the key to enter the programming mode. The lower display will
alternately display the menu level and “Ac.Cd.”
2. Use the and keys to change to the desired menu level.
3. Once you have chosen the desired menu use the key to scroll through the
parameters. To change the setting of a given parameter, use the and
keys.
4. To save settings press the key. The controller now exits the programming
menu and return to the normal operating mode.
5. To change settings on other menu levels, you must re-enter the programming
menu (from step #1).
100°F
100°F 500°F
9 min.
25 min.
21 min.
15 min.
900°F
500°F 108 min.
900°F 132 min.
FROM:
TO:

CAUTION:
• Remove all electrical connections and power before attempting any maintenance.
• Never attempt to remove or insert a probe well insert while the probe well is still hot.
1. Pull the probe well insert release pin from the key ring loop, allowing the well
insert clearance for removal. See Figure 2.
2. Remove the probe well insert using the extraction tool (HP-0037). The tool is
first squeezed, inserted into the aperture of the probe well insert (aligning the
pins of the tool with the holes insert). Then relaxed such that the pins separate,
locking into the holes of the insert on either side of the shaft. Pull the pin out
slowly. See Figure 6.
Figure 10. Removal of Probe Well Insert in CL900A
3.7 Fanning System
The CL900/950 has 2 cooling fans. One is mounted just under the top panel. The
other is mounted just behind the rear panel.
The fans are activated whenever the unit is plugged into a live power outlet.
Regardless of whether the power switch is on, the fan will run for a period of 2
hours or until the power is turned off. The fans will remain on as long as the unit
is turned on. Once the the unit is switched from “ON” mode to “STANDBY”
mode the fans will again run for 2 hours. Never disconnect the power cord
while the unit is still cooling down. A safety hazard may result and the unit
may get damaged.
Operation
3
3-6
EXTRACTION HOLESEXTRACTION TOOL PROBE WELL INSERT
PROBE HOLE

CAUTION:
Never disconnect the power cord while the fan is still cooling down. A safety hazard
may result and the unit may get damaged.
3.8 Overheat Reset Switch
In the event one or both of the fans fail and the temperature inside the unit raise
to an unacceptable level, a thermal cutoff switch will disconnect the heater
power. The controller will still display the desired setpoint temperature,
however, the process temperature will keep falling or not rise at all. At this point
the unit should be sent back to OMEGA for service.
3-7
Operation 3

Section 4 - Maintenance
4.1 Calibration
This unit has been fine tuned at the factory and calibrated to give optimum
performance of its full temperature range. It is recommended that the unit be
returned annually for re-calibration.
4.2 Cleaning
CAUTION:
Remove all electrical connections and power before attempting any maintenance or cleaning.
4.2.1 Main Body
Only a damp soft rag with a mild cleaning solution should be used when
cleaning the main body of this unit.
4.2.2 Probe Well
Send the unit back to OMEGA in the event that the probe well becomes dirty.
Do not attempt remove the probe well from the unit.
4.2.3 Fan and Vent Guards
The fan guard and vent guards should be cleaned as a minimum, annually. A
medium power vacuum cleaner with a brush attachment is recommended.
4.3 Fuse replacement
WARNING:
Disconnect power from source before replacing fuse.
CAUTION:
For continued protection against the risk of fire replace with only the same size, type and
rating fuse indicated here and on the rear panel of your unit.
For model:
CL900A/CL950A use Fuse, 1 ea. T12A, 250 VAC~, (Time Delay)
VDE APPROVED (1⁄4” dia. x 1 1⁄4long).
CL900A-230/CL950A-230 use Fuse, 2 ea. T6.3A, 250 VAC~, (Time Delay)
VDE APPROVED (5mm dia. x 20mm long).
NOTE:
Note that for the CL900A-230/CL950A-230 both fuses need to be checked if there is a
suspicion that a fuse has been blown. One or both fuses may have been damaged.
4-1
Maintenance
4

Section 5 - RS232 Communication
This method allows bi-directional data transfer via a three conductor cable
consisting of signal ground, receive input, and transmit output. It is
recommended that less than fifty feet of cable be used between the computer and
this instrument. Note that multiple instruments cannot be tied to the same port
in this configuration. The RS232 port is optically isolated to eliminate ground
loop problems.
Below is a pinout diagram for the serial port of the CL900A/CL950A as well as
the pinout for a 9-pin PC serial port. Use a straight DB9(female) to DB9(male)
connector cable to connect your computer to the CL900A. The cable should be
attached when only when the computer and CL900A are off.
Only parameters in the parameter list should be modified or queried via the
serial port. Other parameters should be viewed or queried from the controller,
directly. It is highly recommended that baud rate for the controller be modified
on the controller, directly. Note that both the CL900A and the computer must be
communicating with the same serial communications parameters to establish a
working communication link.
The serial communications feature can be tested using terminal emulation
package. Note that this controller does not time out waiting for the next
character to be transmitted. Be sure not to use the XON/XOFF or hardware
handshaking. Lastly, it should be noted that following a complete transmission
to the CL900A, a response it sent back. If the message was valid, the changed or
queried parameter is echoed back (following the same format). If the message
was not according to acceptable format or was attempting to force a parameter
out of range, an "ERROR" message is echoed.
Note, only RS232 protocol is supported by the serial port. Voltage levels are not
to exceed ±12VDC. A standard 9-wire cable should be used, with shielding and
DB9 connectors. The CL900A/CL950A connections are female. Most computers
have a 9-pin male connection. Hence, a male-female cable with straight through
connections is appropriate for interfacing.
Figure 11. Connecting the CL900A to a Computer’s Serial Port
5-1
1
6789
6789
234 5
123 4 5
RX
TX
GND
TX RX GND
RS232 Communication 5

Parameter List (only relevant parameters shown):
PAR#: Parameter: Range/Units:
00 Process Temp. Input determined
01 Setpoint Input determined
19 Baud Selection bAUd
Baud Selections:
Code: Baud: Parity: Data Bits: Stop Bits:
3.o.7 300 odd 7 2
6.o.7 600 odd 7 2
12.o.7 1200 odd 7 2 (factory default settings)
24.o.7 1200 odd 7 2
3.n.8 300 no 8 1
6.n.8 600 no 8 1
12.n.8 1200 no 8 1
24.n.8 2400 no 8 1
General Message Format:
#[controller id][command][parameter number]<new value><units>[CR/LF]
Definitions:
# - This character initiates an "escape sequence" that the controller will recognize.
[controller id] – Up to 2 numeric characters, ’00 to ‘99’ (factory default=’01’)
[command] – 1 character, upper case or lower case
‘R’ – To read a parameter from the controller
‘M’ – To temporarily modify a controller parameter (lost upon shutdown)
‘E’ – To modify a controller param. in non-volatile mem. (saved even after
shutdown)
[parameter #] – Up to 2 numeric characters, ‘00’ to ‘99’
<new value> - This control word is used only when entering or modifying a
parameter.
Up to 6 characters may be entered. The first character can be a space, a ‘+’, or a ’-
‘. The next 4 characters are for entering the new value parameter value. Be sure
to use the exact same field format as is currently being used. (i.e. if the XXX.X
format is used to express temperature, be sure to enter a new value that
conforms to the same format).
<units> - This optional control word is used to specify units, F for °F, C for °C.
[CR/LF] – Every transmission must be terminated with a carriage return [CR]
character.
The line feed [LF] character is optional.
5-2
RS232 Communication
5