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NOVUS N1540 Indicator User Manual

N1540 indicator registers table

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N1540 Indicator
Registers Table

1.1 SERIAL COMMUNICATION

The optional serial interface RS485 allows to address up to 247 indicators in

a network communicating remotely with a host computer or master indicator.
RS485 Interface
• Compatible line signals with RS485 standard.
• 3 wire connection from master to up to 31 slaves indicators in a

multidrop bus. It is possible address 247 nodes with multiple outputs

converters.

• Maximum communication distance: 1000 meters
• The RS485 signals are:

D1 = D:

Bidirectional data line.

D0 = D: Bidirectional inverted data line.

C = GND: Optional connection which left communication better.

General Characteristics
• Optically isolated serial interface.
• Programmable baud rate: 1200, 2400, 4800, 9600, 19200, 38400,

57600 and 115200 bps.

• Data Bits: 8
• Parity: None, Even or Odd.
• Stop Bits: 1
Communication Protocol
The MOSBUS RTU slave is implemented, available in most SCADA

softwares in the market.
All configurable parameters can be accessed (for reading or writing) through

the Registers Table. Broadcast commands are supported as well (address 0).
The available Modbus commands are:

03 - Read Holding Register
05 - Force Single Coil
06 - Preset Single Register
16 - Preset Multiple Register

The registers are arranged in a table in such a way that several registers can

be read in the same request.

1.2 CONFIGURATION OF SERIAL COMMUNICATION

PARAMETERS

Three parameters must be configured in the device for serial communication:

bavd

: Baud rate. All devices with same baud rate.

addr

: Device communication address. Each device must have an

exclusive address.

Prty

: Parity.

1.3 CONNECTIONS

1.4 REGISTERS TABLE

Equivalent to the holding registers (referenced as 4X).
The holding registers are basically a list of the internal indicator parameters.

All registers above address 12 can be read or written. The registers up to this

address in more are read only. Please verify each case. Each table

parameter is a 16 bits two complement signed word.

Holding

Registers Parameter

Register Description

0000

ALrf

Differential alarm reference.
Maximum range: SPLL to SPkL (or the sensor

span)

0001

PV

Read: Process Variable.
Write: Not allowed.
In case of temperature reading, the value read

is always multiplied by 10, independently of
dppo

value.

0002

Reserved Internal use

0003

Reserved Internal use

0004

Display

Value

Read: Current value shown on display.
Write: Current value shown on display.
Range: -2000 to 30000. The range depends on

the displayed parameter.

0005

Prompt

index

Read: Current prompt position in the parameters

flowchart.
Write: no allowed. Range: 0000h to 060Ch
Prompt number format: XXYYh, where:

XX→ menu cycle number

YY→ prompt number

0006 Status Word

1

Read: Status bits.
Write: no allowed.
Valor lido: See Table 2.

0007

Software

Version

Read: The firmware version of indicator. If

V1.00, the read value will be 100.
Write: not allowed.

0008

ID

Read: indicator identification number: 69
Write: not allowed.

0009 Status Word

2

Read: Status bits. See Table 2.
Write: no allowed.

0010 Status Word

3

Read: Status bits. See Table 2.
Write: no allowed.

0011~0015 Reserved Internal use

0016

Freq

Read/Write: Mains frequency.

Range: 0 – 1 (60/50Hz)

0017

Reserved

0018

FLtr

Read/Write: PV digital filter gain.
Range: 0 – 20

0019

Reserved Internal use

0020

SP1.E

Controls the presence of the parameter SPA1 in

the indicator operation cycle.
0→ Disables;
1→ Enables;

0021

SP2.E

Controls the presence of the parameter Alarm 2

in the indicator operation cycle.
0→ Disables;
1→ Enables;

0022

Reserved Internal use

0023

Serial

number H

Serial number first four digits.
Range: 0 to 9999. Read only.

0024

Serial

number L

Serial number last four digits.
Range: 0 to 9999. Read only.

0025

Reserved Internal use

0026

i

NLL

Defines the minimum PV indication value for

analog input types (used to scale the analog

inputs).