Novus N1040i User manual

NOVUS AUTOMATION 1/7
N1040i Indicator
UNIVERSAL INDICATOR –INSTRUCTIONS MANUAL –V2.0x A
PRESENTATION
N1040i is a quite versatile process indicator. With a wide list of input
types - thermocouples, thermo-resistance, voltage and current –the
N1040i is capable of measuring the majority of the variables and
sensors encountered in industrial processes.
The configuration can be performed directly on the indicator or through
the USB interface. The NConfig software (free) is the configuration
management tool. Connected to the USB of a Windows computer, the
indicator is recognized as a serial communications port (COM) running
with a Modbus RTU protocol.
Through the USB interface, even if disconnected from the power
supply, the configuration performed in a piece of equipment can be can
be saved in a file and repeated in other pieces of equipment that
require the same configuration.
It also features various alarm functions, display offset, configuration
with password protection, serial communication, indication in degrees
Celsius (°C) or Fahrenheit (°F), among others.
FEATURES
SIGNAL INPUT (INPUT)
The input type to be used by the indicator is defined in the equipment
configuration. Table 01 presents the input options available for the
user.
TYPE
CODE
RANGE OF MEASUREMENT
J
Tc j
Range: -110 to 950 ºC (-166 to 1742 ºF)
K
Tc k
Range: -150 to 1370 ºC (-238 to 2498 ºF)
T
Tc t
Range: -160 to 400 ºC (-256 to 752 ºF)
N
Tc n
Range: -270 to 1300 ºC (-454 to 2372 ºF)
R
Tc r
Range: -50 to 1760 ºC (-58 to 3200 ºF)
S
Tc s
Range: -50 to 1760 ºC (-58 to 3200 ºF)
B
Tc b
Range: 400 to 1800 ºC (752 to 3272 ºF)
E
Tc e
Range: -90 to 730 ºC (-130 to 1346 ºF)
Pt100
Pt
Range: -200 to 850 ºC (-328 to 1562 ºF)
0-20 mA
L0.20
Analog Linear Signal
Indication programmable from -1999 to
9999.
4-20 mA
L4.20
0–50 mV
L0.50
0-5 Vdc
L0.5
0-10 Vdc
L0.10
4-20 mA
NON
LINEAR
Lnj
Non Linear Analog Signal
Indication range according to the
associated sensor.
Ln k
ln t
ln n
ln r
ln s
ln b
ln E
Ln.Pt
Table 01 –Inputs Types
ALARMS
The 1040i can have none, one or two alarms. Each alarm present is
associated to one output with the same name (ALARM1 and ALARM2).
OUTPUT ALARM1 - Relay SPDT. Available in terminals 10, 11 and
12 of the indicator.
OUTPUT ALARM2 - Relay SPST-NA. Available in terminals 13 and
14 of the indicator.
The alarms can assume the functions described on Table 02.
off
Alarm off.
lo
Alarm of the Absolute Minimum
Value. It triggers when the
value of the PV is below the
value defined by the alarm
Setpoint (SPA1 or SPA2).
SPA1
PV
ki
Alarm of the Absolute
Maximum Value. It triggers
when the value of the PV is
above the value defined by the
alarm Setpoint.
SPA1
PV
dif
Alarm of the Differential Value. In this function the
parameters “SPA1” and “SPA2” represent errors
(difference) between the PV and one reference value
ALrF.
ALrF
PV
ALrF+SPA1
ALrF–SPA1
ALrF
PV
ALrF –SPA1
alarme
ALrF + SPA1
alarme
SPA1 positive
SPA1 negative
difl
Alarm of the Minimum Differential Value. It triggers when
the value of the PV is below the point defined by:
ALrF-SPA1 (using alarm 1 as an example).
ALrF
PV
ALrF –SPA1
ALrF
PV
ALrF –SPA1
SPA1 positive
SPA1 negative
difk
Alarm of the Maximum Differential Value. It triggers when
the value of the PV is above the point defined by:
ALrF+SPA1 (using alarm 1 as an example).
ALrF
PV
ALrF + SPA1
ALrF
PV
ALrF + SPA1
SPA1 positive
SPA1 negative
ierr
Alarms of the Sensor Break (Sensor Break Alarm). It is
activated when the Input presents problems such as
interrupted sensor, bad connection, etc.
Table 02 –Alarm Functions
Note: The figures are also valid for Alarm 2 (SPA2).

N1040i Indicator
NOVUS AUTOMATION 2/7
BLOCKING INITIAL OF THE ALARM
The initial blocking option inhibits the alarm from being recognized
if an alarm condition is present in the process when the indicator is
first energized. The alarm will be enabled only after the occurrence of
no alarm condition.
The initial blocking is useful, for example, when one of the alarms is
set up as a minimum value alarm, which may cause the activation of
the alarm soon upon the process start-up; an occurrence that may
undesirable in many cases.
The initial blocking is not valid for the function ierr (Sensor Break).
OFFSET
Allows the user to perform fine adjustments to the PV indication. It
allows the correction of measuring errors that appear, for example,
on the replacement of the temperature sensor.
USB INTERFACE
The USB interface is used for CONFIGURING or MONITORING the
indicator. The NConfig software must be used for the configuration. It
makes it possible to create, view, save and open configurations from
the equipment or files in your computer. The tool for saving and
opening configurations in files makes it possible to transfer
configurations between pieces of equipment and to make backup
copies. For specific models, the NConfig software also makes it
possible to update the firmware (internal software) of the indicator
through the USB.
For MONITORING purposes you can use any supervisory software
(SCADA) or laboratory software that supports the MODBUS RTU
communication on a serial communications port. When connected to
the USB of a computer, the indicator is recognized as a conventional
serial port (COM x). Use the NConfig software or consult the
DEVICE MANAGER in the Windows CONTROL PANEL to identify
the COM port that was assigned to the indicator. Consult the
mapping of the MODBUS memory in the indicator’s communications
manual and the documentation of your supervisory software to
conduct the MONITORING process.
Follow the procedure below to use the USB communication of the
equipment:
1. Download the NConfig software from our website and install it on
your computer. The USB drivers necessary for operating the
communication will be installed together with the software.
2. Connect the USB cable between the equipment and the
computer. The indicator does not have to be connected to a
power supply. The USB will provide enough power to operate the
communication (other equipment functions cannot operate).
3. Open the NConfig software, configure the communication and
start recognition of the device.
The USB interface IS NOT SEPARATE from the
signal input (PV) or the indicator’s digital inputs and
outputs. It is intended for temporary use during
CONFIGURATION and MONITORING periods. For
the safety of people and equipment, it must only be
used when the piece of equipment is completely
disconnected from the input/output signals. Using the
USB in any other type of connection is possible but
requires a careful analysis by the person responsible
for installing it. When MONITORING for long periods
of time and with connected inputs and outputs, we
recommend using the RS485 interface, which is
available or optional in most of our products.
RETRANSMISSION OF PV
The indicator may include an analog output which performs the
retransmission of the values of PV into a signal of 0-20 mA or 4-20
mA. The analog retransmission can be scaled, i.e., there are
minimum and maximum limits to establish the retransmission range,
defined in the parameters “rtLL” and “rtkL”.
The analog output is available on terminals 13 and 14 for models
N1040i-RA and N1040i-RA-485.
In order to obtain retransmission in electrical voltage, the user shall
install a shunt resistor (500 max.) across the analog output
terminals. This resistor value depends on the desired voltage range.
The analog retransmission output is not electrically isolated from the
RS485 serial communication.
24 Vdc AUXILIARY VOLTAGE SOURCE
Another feature that may be available in the indicator is an auxiliary
power supply for exciting field transmitters (two-wire 4-20 mA
transmitters).
The 24 Vdc output is on terminals 13 and 14 for models N1040i-RE
and N1040i-RE-485.
The 24 V auxiliary power supply is not electrically isolated from the
RS485 serial communication.
INSTALLATION / CONNECTIONS
The indicator shall be fastened on a panel, following the sequence of
steps described below:
Prepare a cut-out of 46 x 46 mm on the panel;
Remove the mounting clamp from the indicator;
Insert the indicator into the cut-out from the front side of the
panel;
Place the clamp on the indicator again, pressing until firm grip to
the panel.
SAFETY ALERTS
The symbols below are used on the equipment and throughout this
manual in order to draw the user´s attention to important information
related to the equipment safety and operation.
CAUTION:
Read the manual thoroughly
before installing and operating
the equipment
CAUTION OR DANGER:
Electrical shock hazard
All safety related instructions that appear in the manual must be
observed to ensure personal safety and to prevent damage to either
the instrument or the system. If the instrument is used in a manner not
specified by the manufacturer, the protection provided by the
equipment may be impaired.
ELECTRICAL CONNECTIONS
The position of the features on the indicator back panel is shown on
Figure 01:
Figure 01 –Inputs connections and power supply

N1040i Indicator
NOVUS AUTOMATION 3/7
In the models with two alarms and serial communication, the
connections are:
Figure 02 - Alarms and serial communication connections
In the models with one alarm, retransmission of PV and serial
communication, the connections are:
Figure 03 - Alarm, retransmission and serial communication connections
In the models with one alarm, 24 Vdc auxiliary voltage source and
communication, the connections are:
Figure 04 - Alarm, auxiliary source and communication connections
A typical application of the auxiliary voltage source is to supply loop
power for field transmitters (two-wire 4-20 mA). Figure 05 shows the
necessary wiring for this application.
Figure 05 –Example for the use of the indicator auxiliary voltage source
RECOMMENDATIONS FOR THE INSTALLATION
To minimize the pick-up of electrical noise, the low voltage DC
connections and the sensor input wiring should be routed away
from high-current power conductors. If this is impractical, use
shielded cables. In general, keep cable lengths to a minimum.
The input signals conductors shall be positioned throughout the
factory separate from the output and the power supply
conductors, in grounded conduits if possible.
The power supply of the electronic instruments shall come from a
proper source for the instrumentation network.
It is recommended to use RC FILTERS (0.1 uF in series with 100
ohms) to suppress the noise generated by contactors coils,
solenoids, etc.
OPERATION
The indicator front panel, together with its elements, can be seen on
Figure 06:
Figure 06 - Identification of the front panel parts
Display: Shows the process variable PV, the configuration
parameters prompts and their respective values/ conditions.
Indicators A1 and A2: signalize the occurrence of an alarm
condition.
Key P: used to walk through the parameters in the menu cycles.
Increment key and
Decrement key: Used to change
parameter values.
Key: A key used to retrocede to the previous displayed
parameter.
START UP
When the indicator is powered up, its firmware version is displayed
for 3 seconds, after which the N1540 starts normal operation, when
the value of PV is displayed and the outputs are enabled.
Before the indicator is ready to be used in a given process, it requires
some basic configuration, consisting of assigning values to the
parameters according to the desired behavior. The user shall
understand the importance of each parameter and determine a valid
condition or a valid value for each one of them.
The configuration parameters are grouped in parameters levels
according to their functionalities. The 4 parameters levels are:
1 –Operation
2 –Alarms
3 –Input
4 –Calibration
The “P”key provides the access to the levels and to the parameters
of these levels.
Keeping the Pkey pressed, at every 2 seconds, the indicator jumps
from one level to another, presenting the first parameter of each
level:
PV >> fva1 >> type >> pass >> PV …
To enter into a particular level, simply release the Pkey when the
first parameter in that level is displayed.
To walk through the parameters in a level, press the P key with short
strokes. To go back to the previous parameters, use the
Key.
Each parameter symbol is shown on the upper display while its
respective value/condition is shown on the lower display.
Depending on the level of parameter protection adopted, the
parameter PASS precedes the first parameter in the level where the
protection is active. See section PROTECTION CONFIGURATION.

N1040i Indicator
NOVUS AUTOMATION 4/7
DESCRIPTION OF THE PARAMETERS
OPERATION CYCLE
PV
Indication Display of PV. The value of the measured
variable (PV) is shown on the upper display (red).
Sp.a1
Sp.a2
SetPoint
Alarm
Alarm SP: Value that defines the alarm activation
point. For the alarms set up with the functions of the
type Differential, these parameters define the
maximum differences accepted between PV or a
reference value defined in the parameter ALrF.
For the alarm function ierr, this parameter is not used.
Parameters shown in this level only when enabled in
the parameters sp1.E and sp2.E.
ALARMS CYCLE
Fva1
Fva2
Function
Alarm
Alarm Functions. It defines the functions of the alarms
among the options in Table 02.
al.rf
Alarm
Reference
Reference value used by the alarms with differential
function, minimum differential or maximum
differential.
Sp.a1
Sp.a2
SetPoint
Alarm
Alarm SP: Value that defines the point of activation of
the alarm outputs.
For the alarms programmed with the functions of the
type Differential, these parameters represent the
deviations.
For the ierr alarm function, this parameter has no
meaning.
Sp1.e
sp2.e
SP Enable
It allows the display of the parameters SPA1 and
SPA2 also in the indicator operation cycle.
YES shows the parameters SPA1/SPA2 in the
operation cycle
NO DOES NOT show the parameters SPA1/SPA2
in the operation cycle
bla1
bla2
Blocking Alarm
Alarms Initial Blocking.
YES enables the initial blocking
NO inhibits the initial blocking
xya1
xya2
Hysteresis of
Alarm
Alarm Hysteresis. It defines the difference between the
value of PV at which the alarm is triggered and the
value at which it is turned off.
flsh
Flash
It allows signalization of an alarm conditions occurrence
by flashing the indication of PV on the indication display.
YES Enables alarm signalization by flashing PV.
NO Does not enable alarm signalization by flashing
PV.
INPUT CYCLE
Type
Type
Input Type. Selection of the input type, used by the
indicator. Refer to Table 01.
fltr
Filter
Digital Input Filter –Used to improve the stability of
the measured signal (PV). Adjustable between 0 and
20. At 0 (zero) it means filter turned off and 20 means
maximum filter. The higher the filter value, the slower
is the response of the measured value.
Dp.po
Decimal Point
It determines the position of the decimal point on the
display.
vnit
Unit
It defines the temperature unit to be used:
( indication in Celsius.
f indication in Fahrenheit.
0ffs
Offset
Parameter that allows the user to make corrections in
the value of PV indicated.
inll
Input Low
Limit
It defines the lower value of the indication range when
the input types of 0-20 mA, 4-20 mA, 0-50 mV, 0-5 V
and 0-10 V are used.
inxl
input High
Limit
It defines the upper value of the indication range when
the input types of 0-20 mA, 4-20 mA, 0-50 mV, 0-5 V
and 0-10 V are used.
Retr
Retransmission
It allows the definition of the mode of retransmission
of PV.
P020 Determines retransmission in 0-20 mA.
P420 Determines retransmission in 4-20 mA.
Parameter shown when there is retransmission of PV
available on the indicator.
Rtll
Retransmission
Low Limit
It defines the lower limit of the retransmission range of
PV. Parameter shown there is retransmission of PV
available on the indicator.
Rtkl
Retransmission
High Limit
It defines the upper limit of the retransmission range
of PV. Parameter shown there is retransmission of PV
available on the indicator.
bavd
Baud Rate
Baud Rate of the serial communication. In kbps.
1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6 and 115.2
prty
Parity
Parity of the serial communication.
none Without parity
Even Even parity
0dd Odd parity
Addr
Address
Communication Address. A number that identifies the
indicator in the serial communication network,
between 1 and 247.
CALIBRATION CYCLE
All types of input are calibrated in the factory. In case a
recalibration is required; it shall be carried out by a specialized
professional. In case this cycle is accidentally accessed, do not
perform alteration in its parameters. The factory calibration can
be restored in the parameter rstr.
pass
Password. Entering the Access password. This
parameter is presented before the protected cycles.
See item Protection of Configuration.
(alib
Calibration. Enables the possibility for calibration of
the indicator. When the calibration is not enabled, the
related parameters are hidden.
inL(
Input Low Calibration. Indication of the low scale
calibration signal applied to the input.
ink(
Input High Calibration. Indication of the full scale
calibration signal applied to the input.
ovL(
Output Low Calibration. Enter the analog value as
measured at the analog output.
ovk(
Input High Calibration. Enter the analog value as
measured at the analog output.
rstr
Restore. It restores the factory calibrations of the
input, disregarding any modifications carried out by the
user.
(j
Cold Junction. Temperature of the indicator cold
junction.
Pas.(
Password Change. It allows the definition of a new
access password, always different from zero.
Prot
Protection. Sets up the Level of Protection. See Table
03.
Freq
Frequency. Frequency of the local electrical network.

N1040i Indicator
NOVUS AUTOMATION 5/7
CONFIGURATION PROTECTION
The indicator allows the protection of the configuration performed by
the user, not allowing improper modifications. The parameter
Protection (PROt), in the Calibration level, determines the
protection strategy to be adopted, limiting the access to the levels,
according to the table below.
Protection Level
Protected Levels
1
Only the Calibration level is protected.
2
Input and Calibration levels are protected.
3
Alarms, Input and Calibration levels are
protected.
Table 03 –Levels of Protection of the Configuration
ACCESS PASSWORD
The protected levels, when accessed, request the user to provide the
Access Password for granting permission to change the
configuration of the parameters on these levels.
The prompt PASS precedes the parameters on the protected levels.
If no password is entered, the parameters of the protected levels can
only be visualized.
The Access Password is defined by the user in the parameter
Password Change (PAS.(), present in the Calibration Level. The
factory default for the password code is 1111.
PROTECTION OF THE ACCESS PASSWORD
The protection system built into the indicator blocks for 10 minutes
the access to protected parameters after 5 consecutive frustrated
attempts of guessing the correct password.
MASTER PASSWORD
The Master Password is intended for allowing the user to define a
new password in the event of it being forgotten. The Master
Password doesn’t grant access to all parameters, only to the
Password Change parameter (PAS(). After defining the new
password, the protected parameters may be accessed (and
modified) using this new password.
The master password is made up by the last three digits of the serial
number of the indicator added to the number 9000.
As an example, for the equipment with serial number 07154321, the
master password is 9 3 2 1.
The indicator serial number can be obtained by pressing
for 5
seconds.
MAINTENANCE
PROBLEMS WITH THE INDICATOR
Connection errors and inadequate programming are the most
common problems en ountered during the indicator operation. A final
revision can avoid loss of time and damages.
The indicator displays some messages to help the user identify the
problems.
MESSAGE
DESCRIPTION OF THE PROBLEM
----
Open input. Without sensor or signal.
Err1
Err6
Connection and/ or configuration problems. Check
the wiring and the configuration.
Other error messages may indicate hardware problems requiring
maintenance service. When contacting the manufacturer, inform the
instrument serial number, obtained by pressing the key
for more
than 3 seconds.
INPUT CALIBRATION
All inputs are factory calibrated and recalibration should only be done
by qualified personnel. If you are not familiar with these procedures
do not attempt to calibrate this instrument.
The calibration steps are:
a) Configure the type of input to be calibrated.
b) Configure the lower and upper limits of indication for the
maximum span of the selected input type.
c) At the input terminals inject a signal corresponding to a known
indication value a little above the lower display limit.
d) Access the parameter “inL(”. With the keys
and
, f adjust
the display reading such as to match the applied signal. Then
press the
P
key.
e) Inject a signal that corresponds to a value a little lower than the
upper limit of indication.
f) Access the parameter “ink(”. With the keys
and
, adjust
the display reading such as to match the applied signal. Then
press the
P
key.
Note: When checking the indicator calibration with a Pt100 simulator,
pay attention to the simulator minimum excitation current
requirement, which may not be compatible with the 0.170 mA
excitation current provided by the indicator.
ANALOG OUTPUT CALIBRATION
1. Configure analog input for 0-20 mA retransmission (retr =p.0.20 ).
2. Attach a milliamp meter to terminals 13 and 14.
3. Enter Calibration Cycle.
4. Access “ovl(”calibration parameter and press
followed by
.
5. Using
or
Keys, set “ovLC” parameter to the same value
read in the milliamp meter
6. Access “ovk(”calibration parameter and press
followed by
.
7. Using
or
Keys, set “ovkC” parameter to the same value
read in the milliamp meter.
8. Exit Calibration Cycle.
SPECIFICATIONS
DIMENSIONS:............................................................48 x 48 x 80 mm
Approximate Weight: ...............................................................75 g
POWER SUPPLY: .........................100 to 240 Vac (±10 %), 50/60 Hz
Optional 24 V......................12 a 24 Vdc / 24 Vac (-10 % / +20 %)
................................... 24 to 240 Vdc (±10 %) for model N1040i-F
Maximum consumption: ........................................................ 6 VA
ENVIRONMENTAL CONDITIONS:
Operation Temperature: ................................................ 0 to 50 ºC
Relative Humidity:....................................................80 % @ 30 ºC
For temperatures above 30 ºC, reduce 3 % per ºC
Indoor use; Installation Category II, Pollution Degree 2; altitude <
2000 meters
INPUT................................................................According to Table 01
Internal Resolution:...................................... 32767 levels (15 bits)
Display Resolution:................................................0.1 / 1 (°C / °F)
Input reading rate: ..........................................up to 55 per second
Precision @ 25 °C:.... J, K, T, E: 0.25 % of the span 0.1 °C / °F
..................................... N, R, S, B: 0.25 % of the span 1 °C / °F
................................................................Pt100: 0.2 % of the span
.....................4-20 mA, 0-50 mV, 0-5 V, 0-10 V: 0.2 % of the span
Input impedance:........ Pt100, thermocouples, 0-50 mV: > 10 M
................................................................. 0-5 V, 0-10 V: > 500 k
..............................................................................4-20 mA: 100 
Measuring of the Pt100: .........................3 wire type, (=0.00385)
With compensation of the cable length, max 50 meters,
excitation current of 0.170 mA.

N1040i Indicator
NOVUS AUTOMATION 6/7
OUTPUT ALARM1:.....................Relay SPDT; 240 Vac / 30 Vdc / 3 A
OUTPUT ALARM2:........... Relay SPST-NA; 240 Vac / 30 Vdc / 1,5 A
RETRANSMISSION OF PV: ................................................................
..................................0-20 mA / 4-20 mA / 500 max. / 12.000 levels
24 Vdc SOURCE:..................................24 Vdc (±10 %) / 20 mA max.
CASE:.................................................. Polycarbonate (PC) UL94 V-2
BACK PANEL: .......................................................ABS+PC UL94 V-0
ELECTROMAGNETIC COMPATIBILITY: ............... EN 61326-1:1997
and EN 61326-1/A1:1998
SAFETY: .......................... EN61010-1:1993 and EN61010-1/A2:1995
ADEQUATE CONNECTIONS FOR TERMINALS OF THE CLAMP
TYPE;
STARTS OPERATION: after 3 seconds connected to the power
supply;
CERTIFICATIONS:and .
IDENTIFICATION
N1040i -
A -
B -
C
A: Outputs Features
RR 2 relays available (ALARM1 / ALARM2)
RA 1 relay and one analog output 0-20 / 4-20 mA
RE 1 relay and one auxiliary 24 Vdc voltage source
B: Digital Communication
485 RS485 available
C: Power Supply Features (POWER)
Blank 100 a 240 Vac/dc
24V 12 a 24 Vdc / 24 Vac
F 24 a 240 Vac/dc
SAFETY INFORMATION
Any control system design should take into account that any part of
the system has the potential to fail. This product is not a protection or
safety device and its alarms are not intended to protect against
product failures. Independent safety devices should be always
provided if personnel or property are at risk.
Product performance and specifications may be affected by its
environment and installation. It’s user’s responsibility to assure
proper grounding, shielding, cable routing and electrical noise
filtering, in accordance with local regulations, EMC standards and
good installation practices.
SUPPORT AND MAINTENANCE
This product contains no serviceable parts inside. Contact our local
distributor in case you need authorized service. For troubleshooting,
visit our FAQ at www.novusautomation.com.
LIMITED WARRANTY AND LIMITATION OF
LIABILITY
NOVUS warrants to the original purchaser that this product is free
from defects in material and workmanship under normal use and
service within one (1) year from the date of shipment from factory or
from its official sales channel to the original purchaser.
NOVUS liability under this warranty shall not in any case exceed the
cost of correcting defects in the product or of supplying replacement
product as herein provided and upon the expiration of the warranty
period all such liability shall terminate.
For complete information on warranty and liability limitations, check
appropriate section in our web site:
www.novusautomation.com/warranty.

N1040i Indicator
NOVUS AUTOMATION 7/7
APPENDIX 1 - SERIAL COMMUNICATION
The indicator may be supplied with an asynchronous serial
communication RS-485 interface, with a master-slave connection for
communication with a host computer (master). The indicator is
always the slave. The communication is always initiated by the
master, which sends a command to the slave address with which to
communicate. The addressed slave recognizes the command and
sends a response to the master. The indicator also accepts
broadcast commands.
CHARACTERISTICS
Signals compatible with RS-485 standard. MODBUS (RTU)
Protocol. Two wire connection between 1 master and up to 31
(addressing up to 247 possible) instruments in bus topology.
Communication signals are electrically isolated from the INPUT
and POWER terminals. Not isolated from the retransmission
circuit and the auxiliary voltage source when available.
Maximum connection distance: 1000 meters.
Time of disconnection for the indicator: Maximum 2 ms after last
byte.
Programmable baud rate: 1200 to 115200 bps.
Data Bits: 8
Parity: Even, Odd or None
Stop bits: 1
Time at the beginning of response transmission: maximum 100 ms
after receiving the command.
The RS-485 signals are:
D0
Bi-directional inverted data line.
Other names: D/, D- or A
D1
Bi-directional data line.
Other names: D, D+ or B
GND
Optional connection that improves the performance
of the communication.
CONFIGURATION OF SERIAL COMMUNICATION PARAMETERS
Three parameters must be configured in the device for serial
communication:
bavd: Communication speed.
Prty: Parity of the communication.
addr: Communication address for the indicator.