3Com DIN Digital Indicator 59039-2 User manual

18-DIN DIGITAL INDICATOR
PRODUCT MANUAL
59039-2

CAUTION: REFER TO MANUAL
THE INTERNATIONAL HAZARD SYMBOL IS INSCRIBED ADJACENT TO
THE REAR CONNECTION TERMINALS. IT IS IMPORTANT TO READ THE
MANUAL BEFORE INSTALLING OR COMMISSIONING THE UNIT.
PREFACE
This manual comprises two volumes:
Volume I:This supports normal operation of the
1
8
-DIN
Digital Indicator. In normal operation, all actions
taken by the user are to be in front of the panel.
Volume II: This supports the installation, commissioning and
configuring of the 1
8
-DIN Digital Indicator. It is
intended for use only by personnel who are trained,
equipped and authorised to carry out these functions.

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Product Manual - Volume I
18-DIN DIGITAL INDICATOR
PRODUCT MANUAL
VOLUME I
OPERATING INSTRUCTIONS
In normal operation, the operator must not remove the
Indicator from its housing or have unrestricted access to the
rear terminals, as this would provide potential contact with
hazardous live parts.
Installation and configuration must be undertaken by
technically competent servicing personnel. This is covered in
Volume II of this manual.

Contents
1INTRODUCTION1-1
2OPERATOR MODE2-1
3SET UP MODE3-1
4RS485 SERIAL COMMUNICATIONS4-1
Appendices
AAlphabetical IndexA-1
(ii)November, 2000SM067-V1
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8
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Product Manual - Volume I

SECTION 1
INTRODUCTION
The
1
8
-DIN Digital Indicator is an easy-to-operate microprocessor-based instrument,
incorporating the latest in surface-mount and CMOS technology. The standard features
include:
*Large four-digit LED display (orderable as red or green).
*Display for units indication
*Universalsensorinput-thermocouple,three-wireRTDorDClinear
(mA, mV or V)
*Input range selected from the front panel.
*Alarm 1 latching or non-latching (user-selectable) relay output
*Alarm hysteresis
*Maximum Hold, Minimum Hold and Time Elapsed features.
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*90 - 264V AC power supply.
*Designedto complywith EN50081Part 2(Emission) andEN50082
(Immunity) EMC specifications.
*Front panel sealing to IP65 (NEMA 4) standard.
*Programmable digital filter.
*Process Variable offset facility
*Alarm type selected from front panel.
*Sensor Break indication.
and the many optional features include:
*Alarm 2 and Alarm 3 relay outputs
*Remote reset of latched alarm
*Re-transmitted Process Variable output
*Transmitter power supply
*ASCII and MODBUS communications protocols
*RS485 serial communications.
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SECTION 2
OPERATOR MODE
2.1INTRODUCTION
The Operator Mode is the normal mode of the Indicator, once it has been set up and
configured as required. The front panel displays, indicators and keys are shown in
Figure 2-1.
2.2 FOUR-DIGIT DISPLAY
In Operator Mode, this normally displays the process variable value. Using the Scroll
key, the operator may view, in a sequence according to the Operator Mode Display
Strategy parameter in Set Up Mode (see NOTES ON TABLE 3-1):
(i)Currentmaximumvalueattainedbyprocessvariable(sincethemaximum
value was last reset)- MAXindicator ON when this is displayed. Also saves
the Sensor Break (see Subsection 2.6) and Over-Range (see Subsection
2.5) conditions.
(ii) Current minimum value attained by process variable (since the minimum
value was last reset) - MINindicator ON when this is displayed. Also saves
the Sensor Break (see Subsection 2.6) and Under-Range (see Subsection
2.5) conditions.
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Figure 2-1Front Panel Controls, Displays and Indicators

(iii) Time elapsed in the Alarm 1 active condition (units display shows ).
The display is in the format mm.ss [mm = minutes, ss = seconds] or mmm.s
[mmm=minutes,s=seconds(tens)].Ifelapsedtimeisgreaterthan999min-
utes 59 seconds, display will show:
NOTE: This does not include time when Alarm 1 is latched but alarm condi-
tion is cleared
(iv)Alarm1value (unitsdisplayshows or,ifonlyAlarm1present, ).
(v) Alarm 2 value, if fitted and configured (units display shows ).
(vi) Alarm 3 value, if fitted and configured (units display shows ).
(iv) Process variable value.
Further depressions of the Scroll key will repeat this display sequence.
2.3ALARM STATUS INDICATORS
The Alarm Status indicators show the current state of the alarm(s):
AL1 - Flashes when Alarm 1 is active (with latching alarm, ON when
Alarm 1 is latched but alarm condition has cleared)
AL2 - Flashes when Alarm 2 is active
AL3 - Flashes when Alarm 3 is active
For descriptions of the operation of the various types of alarm available, see Section 3.
2.4RESETTING THE MAXIMUM VALUE/MINIMUM VALUE OR TIME ELAPSED
VALUE
To reset the maximum value, minimum value (to the process variable value at the
instant of resetting) or time elapsed value (to zero):
1. Select the display of the maximum value, minimum value or time
elapsed value (as appropriate - see above).
2. Depress the Raise key or Lower key for three seconds.
The resetting of the value is indicated by the four-digit display showing:
for two seconds before reverting to the maximum value or minimum value display.
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2.5OVER-RANGE/UNDER-RANGE DISPLAYS
If the process variable attains a value higher than the input scale maximum limit
(over-range) or lower than the input scale minimum limit (under-range), the upper
display will show:
for the over-range condition and:
for the under-range condition.
2.6SENSOR BREAK INDICATION
If a break is detected in the sensor circuit, the four-digit display will show:
The reaction of the alarms to a detected sensor break is dependent upon the input type.
2.7 COLD JUNCTION COMPENSATION DISABLED
If a thermocouple input is fitted, the Cold Junction Compensation should
be enabled. If it is disabled, whenever the process variable is displayed,
the unit display will be as shown on the right.
2.8 RESETTING THE LATCHED ALARM
If Output 1 is configured to be a latched alarm output, once it becomes active it will
remain active (even if the alarm condition itself is cleared) until reset either from the
front panel or via the Remote Reset hardware option. To reset the latched alarm from
the front panel:
1. Ensure that the normal Operating Mode display (i.e. process variable)
is shown.
2. Press either the Raise key or the Lower key for at least three seconds.
The four-digit display will then show:
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for two seconds, indicating that the latched alarm has been reset. The latched Alarm 1
can be reset only if the original alarm condition has been cleared; this reset has no
effect whilst the alarm condition prevails.
2.9VIEWING THE HARDWARE DEFINITION CODE
The operator may view the current Hardware Definition Code setting in the four-digit
display by simultaneously depressing the Lower and Scroll keys. A return may be made
to the normal Operator Mode display by simultaneously depressing the Lower and
Scroll keys.
NOTE: An automatic return is made to the normal Operator Mode
display after 30 seconds.
To view the Hardware Option setting, press the Scroll key whilst the Hardware
Definition Code is displayed. To return to the Hardware Definition Code display,
depress the Lower and Scroll keys simultaneously.
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SECTION 3
SET UP MODE
3.1ENTRY INTO SET UP MODE
To enter Set Up Mode, with the instrument initially in Operator Mode displaying the
process variable value, depress the Raise and Scroll keys simultaneously for three
seconds. The instrument will then enter Set Up Mode and the SETindicator will come
ON, the instrument still displaying the process variable value.
NOTE: If the four-digit display shows:
(i.e. all decimal point positions illuminated), this indicates that one or
more of the critical Configuration Mode parameters - typically input
range - have been altered in value/setting and, as a consequence, all
Set Up Mode parameters have been automatically set to their default
values/settings. To clear this display, simply alter the value/setting of
any Set Up Mode parameter (see below).
The parameters available for view/adjustment in Set Up Mode are summarised in Table
3-1. When Set Up Mode is active, the units display (normally
o
F,
o
C or blank) will show
the single-character legend for the selected parameter and the value for that parameter
will be shown in the four-digit display. The user may step through the Set Up Mode
parameters by depressing the Scroll key. The value/setting may be altered using the
Raise/Lower keys.
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Table 3-1Set Up Parameters
Parameter
Alarm 1 Value
1
Alarm 1 Hysteresis
Alarm 2 Value 2
Alarm 2 Hysteresis 2
Alarm 3 Value 3
Alarm 3 Hysteresis 3
Process Variable Offset
Digital Filter Time Const.
Linear Input Decimal
Point Position
4
Linear Input Scale
Range Minimum
4
Linear Input Scale
Range Maximum
4
Recorder Output Scale
Minimum
Recorder Output Scale
Maximum
Operator Mode Display
Strategy 5
Legend
orAdjustment Range Range Min. to Range Max.
1 LSD to 10% of span expressed
as display units
Range Min. to Range Max.
1 LSD to 10% of span expressed
as display units
Range Min. to Range Max.
1 LSD to 10% of span expressed
as display units
input span of instrument
0.0 secs. (OFF) to 100.0 secs. in
0.5 sec. increments.
0 (XXXX), 1 (XXX.X), 2 (XX.XX)
or 3 (X.XXX)
–1999 to 9999
–1999 to 9999
–1999 to 9999
–1999 to 9999
0, 1, 2, 3 or 4
Default
Range Max. (Proc. High)
Range Min. (Proc. Low)
1 LSD
Range Max. (Proc. High)
Range Min. (Proc. Low)
1 LSD
Range Max. (Proc. High)
Range Min. (Proc. Low)
1 LSD
0
2.0 secs.
1
0000
1000
Range Min.
Range Max.
0

3.2ALARM 1 VALUEor
If Alarm 1 is selected to be a Process High alarm, this defines the process variable
value at or above which Alarm 1 will be active; the default value will be Input Range
Maximum. If Alarm 1 is selected to be a Process Low alarm, this defines the process
variable value at or below which Alarm 1 will be active; the default value will be Input
Range Minimum. Its value may be adjusted between Input Range Maximum and Input
Range Minimum. Alarm operation is illustrated in Figure 3-1.
3.3 ALARM 1 HYSTERESIS
This parameter applies a hysteresis band on the “safe” side of the Alarm 1 value. The
effect of the hysteresis value on alarm operation is shown in Figure 3-2.
3.4ALARM 2 VALUE
If Alarm 2 is selected to be a Process High alarm, this defines the process variable
value at or above which Alarm 2 will be active; the default value will be Input Range
Maximum. If Alarm 2 is selected to be a Process Low alarm, this defines the process
variable value at or below which Alarm 2 will be active; the default value will be Input
Range Minimum. Its value may be adjusted between Input Range Maximum and Input
Range Minimum. Alarm operation is illustrated in Figure 3-1.
3.5 ALARM 2 HYSTERESIS
This parameter applies a hysteresis band on the “safe” side of the Alarm 2 value. The
effect of the hysteresis value on alarm operation is shown in Figure 3-2.
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NOTES ON TABLE 3-1
1. The legend for this parameter will be if only Alarm 1 is fitted/configured or if o ther
alarms are fitted/configured.
2. These parameters appear in the display sequence only if Alarm 2 is fitted/configured.
3. These parameters appear in the display sequence only if Alarm 3 is fitted/configured.
4. Only applicable if a DC Linear input is fitted.
5. Defines the parameters displayed in sequence in Operator Mode:
0
PV value
Max. PV value
Min. PV value
Elapsed Time
1
PV value
Max. PV value
Min. PV value
2
PV value
Alarm 1 value
Alarm 2 value *
Alarm 3 value *
3
PV value
Max. PV value
Min. PV value
Alarm 1 value
Alarm 2 value *
Alarm 3 value *
4
PV value
Max. PV value
Min. PV value
Elapsed Time
Alarm 1 value
Alarm 2 value *
Alarm 3 value
Parameter Setting
* If configured/fitted

3.6ALARM 3 VALUE
If Alarm 3 is selected to be a Process High alarm, this defines the process variable
value at or above which Alarm 3 will be active; the default value will be Input Range
Maximum. If Alarm 3 is selected to be a Process Low alarm, this defines the process
variable value at or below which Alarm 3 will be active; the default value will be Input
Range Minimum. Its value may be adjusted between Input Range Maximum and Input
Range Minimum. Alarm operation is illustrated in Figure 3-1.
3.7 ALARM 3 HYSTERESIS
This parameter applies a hysteresis band on the “safe” side of the Alarm 3 value. The
effect of the hysteresis value on alarm operation is shown in Figure 3-2.
3.8PROCESS VARIABLE OFFSET
This parameter is used to modify the actual process variable value (measured at the
input terminals) in the following manner:
Offset PV value = Actual PV value + Process Variable Offset value.
The offset process variable value is used for all PV-dependent functions (display,
alarm, recorder output).
CAUTION:Thisis,ineffect,acalibration adjustment.Injudiciousapplication
ofvaluestothisparametercouldleadtothedisplayedprocessvariablevalue
bearing no meaningful relationship to the actual process variable value.
There is no front panel indication when this parameter is in effect (i.e.
has been set to a non-zero value).
The default value is 0.
3.9 INPUT FILTER TIME CONSTANT
The input is equipped with a digital filter which is used to filter out any extraneous
impulses on the process variable. This filtered PV is used for all PV-dependent
functions (alarms etc.). The time constant for this filter may be adjusted in the range 0.0
seconds (filter OFF) to 100.0 seconds in 0.5 second increments. The default setting is
2.0 seconds.
CAUTION:If this parameter is set excessively high, the indication
quality may be significantly impaired. The value chosen should be
sufficiently large to attenuate stray noise but no larger.
3.10LINEAR INPUT SCALE RANGE MINIMUM
This parameter, applicable only if a linear input is fitted, defines the scaled input value
when the process variable input is at its minimum value. It is adjustable between –1999
and 9999 (with decimal point as defined by Linear Input Decimal Point Position). The
default value is 0. This parameter can be set to a value greater than (but not equal to)
Linear Input Scale Range Maximum, in which case the sense of the input is reversed.
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3.11LINEAR INPUT SCALE RANGE MAXIMUM
This parameter, applicable only if a linear input is fitted, defines the scaled input value
when the process variable input is at its maximum value. It is adjustable between –1999
and 9999 (with decimal point as defined by Linear Input Decimal Point Position). The
default value is 1000. This parameter can be set to a value less than (but not equal to)
Linear Input Scale Range Minimum, in which case the sense of the input is reversed.
3.12RECORDER OUTPUT SCALE MINIMUM
This parameter defines the value of the process variable at which the Recorder Output
reaches its minimum value; for example, for a 0 - 5V Recorder Output, this value
corresponds to 0V. It may be adjusted within the range –1999 to 9999. The decimal
point position for the Recorder Output is always the same as that for the process
variable input range. The default value is Input Range Minimum. This parameter is not
applicable if the Recorder Output option is not fitted.
NOTE: If this parameter is set to a value greater than that for the
Recorder Output Scale Maximum(see Subsection 3.13), the
relationship between the process variable value and the Recorder
Output is reversed.
3.13 RECORDER OUTPUT SCALE MAXIMUM
This parameter defines the value of process variable at which the Recorder Output
reaches its maximum value; for example, for a 0 - 5V Recorder Output, this value
corresponds to 5V. It may be adjusted within the range –1999 to 9999. The decimal
point position for the Recorder Output is always the same as that for the process
variable input range. The default value is Input Range Maximum. This parameter is not
applicable if the Recorder Output option is not fitted.
NOTE:IfthisparameterissettoavaluelessthanthatfortheRecorder
Output Scale Minimum(see Subsection 3.12), the relationship
between the process variable/setpoint value and the Recorder Output
is reversed.
3.14 OPERATOR MODE DISPLAY STRATEGY
This defines the sequence of parameter displays available in Operator Mode (see
NOTES ON TABLE 3-1).
3.15EXIT FROM SET UP MODE
To leave Set Up Mode, select the initial Operator Mode display (process variable value)
then depress the Raise and Scroll keys simultaneously, whereupon the SETindicator
will go OFF and the instrument will return to Operator Mode.
NOTE: An automatic return to Operator mode will be executed if there
is no key activity in Set Up Mode for one minute.
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Figure 3-1Alarm Operation
Process Low Alarm
direct-acting
Process Low Alarm
reverse-acting
Process High Alarm
direct-acting
Process High Alarm
reverse-acting
Figure 3-2Alarm Hysteresis Operation
Alarm Hysteresis
Alarm Hysteresis
Alarm Value
Process Variable
Alarm Inactive
Alarm Inactive Alarm InactiveAlarm Active
Alarm Value
Alarm Inactive
Alarm Active
Process Variable
PROCESS
HIGH
ALARM
PROCESS
LOW
ALARM

SECTION 4
RS485 SERIAL COMMUNICATIONS
This three-wire RS485-compatible serial communications option is the means by which
communication may occur between the instrument and a master device (e.g. a
computer or terminal).
4.1PHYSICAL REQUIREMENTS
There are two communications protocols available with this option:
(a) ASCII
(b) MODBUS
4.1.1Character Transmission
Data format is fixed to be seven data bits and one stop bit. The Baud rate may be
selected to be 1200, 2400, 4800 (default) or 9600 Baud. For ASCII protocol, the parity
is even. For MODBUS protocol, the parity is selectable to be even, odd or none.
4.1.2Line Turn-Round
ASCII Protocol:The communications link is operated as a multi-drop half
duplexsystem.Whenadeviceistransmitting,itdrivesthetransmissionlines
to the appropriate levels; when it is not transmitting, its outputs are set to a
highimpedance inorder thatanother devicecantransmit.Itisimportantthat
a transmitter releases the transmission lines before another device starts
transmission. This imposes the following restraints on the master device:
(a) The transmitter must release the transmission lines within 6ms of
theendof the lastcharacterof a messagebeingtransmitted. Note that
delays due to buffers such as those used in universal asynchronous
receivers/transmitters(UARTs)withinthemasterdevicemustbetaken
into account.
(b) The transmitter must not start transmission until 6ms has elapsed
since the reception of the last character of a message.
All instruments in this range having an RS485 communications facility ad-
here to this standard; thus, provided that the master device conforms simi-
larly to the standard, there should be no line contention problems.
MODBUSProtocol:Thelineturn-roundtimingsadheretotheindustrystan-
dard.
4.2ASCII PROTOCOL
This protocol assumes half duplex communications. All communication is initiated by
the master device. The master sends a command or query to the addressed slave and
the slave replies with an acknowledgement of the command or the reply to the query.
All messages, in either direction, comprise:
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(a) A Start of Message character
(b) One or two address characters (uniquely defining the slave)
(c) A parameter/data character string
(d) An End of Message character
Messages from the master device may be one of four types:
Type 1:L {N} ? ? *
Type 2:L {N} {P} {C} *
Type 3: L {N} {P} # {DATA} *
Type 4: L {N} {P} I *
where all characters are in ASCII code and:
Lis the Start of Message character (Hex 4C)
{N}is the slave address (in the range 1 - 32); addresses 1 - 9
may be represented by a single digit (e.g. 7) or in two-digit
form, the first digit being zero (e.g. 07).
{P} is a character which identifies the parameter to be interro-
gated/modified - see Table 4-2.
{C}is the command (see below)
#indicates that {DATA} is to follow (Hex 23)
{DATA}isastringofnumericaldatainASCIIcode(seeTable4-1)
*is the End of Message character (Hex 2A)
No space characters are permitted in messages. Any syntax errors in a received
message will cause the slave to issue no reply and await the Start of Message
character.
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Table 4-1{DATA} Element - Sign and Decimal Point Position
+abcd
+abc.d
+ab.cd
+a.bcd
–abcd
–abc.d
–ab.cd
–a.bcd
{DATA} Content
abcd0
abcd1
abcd2
abcd3
abcd5
abcd6
abcd7
abcd8
Sign/Decimal Point Position
Table 4-2Commands/Parameters and Identifiers
Identifier
Character
A
B
C
D
E
F
G
H
J
L
M
N
O
Q
T
Z
[
\
]
m
Parameter/Command
Maximum Process Variable value
Minimum Process Variable value
Alarm 1 value
Alarm 1 Hysteresis value
Alarm 2 value 1
Alarm 2 Hysteresis value 1
Scale Range Maximum
Scale Range Minimum
Process Variable Offset value
Instrument Status
2
Process Variable value
Alarm 3 value
3
Alarm 3 Hysteresis
3
Scale Range Decimal Point Position
Time Elapsed
Instrument Commands 4
Recorder Output Scale Maximum 5
Recorder Output Scale Minimum 5
Scan Table
6
Input Filter Time Constant value
NOTES
1. Applicable only if Alarm 2 is configured.
2. See Subsection 4.3.15.
3. Applicable only if Alarm 3 is configured.
4. See Subsection 4.3.16.
5. Applicable only if Output 2 is configured as a Recorder Output.
6. See Subsection 4.3.17.
Operation
Read Only
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write (linear inputs
only) - otherwise Read Only
Read/Write (linear inputs
only) - otherwise Read Only
Read/Write
Read Only
Read Only
Read/Write
Read/Write
Read/Write (linear inputs
only) - otherwise Read Only
Read Only
Write Only
Read/Write
Read/Write
Read Only
Read/Write

4.2.1Type 1 MessageL {N} ? ? *
This message is used by the master device to determine whether the addressed slave
is active. The reply from the slave instrument, if it is active, is
L {N} ? A *
An inactive instrument will give no reply.
4.2.2 Type 2 MessageL {N} {P} {C} *
This type of message is used by the master device to interrogate or modify a parameter
in the addressed instrument. {P} identifies the parameter (as defined in Table 4-2) and
{C} represents the command to be executed, which may be one of the following:
+ (Hex 2B) - Increment the value of the parameter defined by {P}
– (Hex 2D) - Decrement the value of the parameter defined by {P}
? (Hex 3F) - Determine the current value of the parameter defined by {P}
The reply from the addressed instrument is of the form:
L {N} {P} {DATA} A *
where {DATA} comprises five ASCII-coded digits whose format is shown in Table 4-1.
The data is the value requested in a query message or the new value of the parameter
after modification. If the action requested by the message from the master device would
result in an invalid value for that parameter (either because the requested new value
would be outside the permitted range for that parameter or because the parameter is
not modifiable), the instrument replies with a negative acknowledgement:
L {N} {P} {DATA} N *
The {DATA} string in the negative acknowledgement reply will be indeterminate.
Scan Tables
A parameter identifier character “]” in the message from the master device indicates
that a “Scan Table” operation is required. This provides a facility for interrogating the
values of a group of parameters and status in a single message from the master
device. The reply to such a command would be in the form:
L {N} ] 25 aaaaa bbbbb ccccc ddddd eeeee A *
The digits aaaaa, bbbbb etc. are expressed as shown in Table 4-1. For further
information, refer to Subsection 4.3.17.
4.2.3Type 3 Message L {N} {P} # {DATA} *
This message type is used by the master device to set a parameter to the value
specified in {DATA}. The command is not implemented immediately by the slave
instrument; the slave will receive this command and will then wait for a Type 4 message
(see below). Upon receipt of a Type 3 message, if the {DATA} content and the specified
parameter are valid, the slave reply is of the form:
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