Novus NC400-6 User Manual download pdf

NC400-6

Communication Protocol

1. SERIAL COMMUNICATION

RS485 Interface

• Compatible line signals with RS485 standard

• 2 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 Bidirectional data line.

Bidirectional inverted data line.

C Communication common signal. Interconnect this terminal in all devices of the

bus for protection (optional).

General Characteristics

• Optically isolated serial interface

• Baud rate: 9600 bps.

• Data bits: 8

• Parity: None

• Stop Bits: 1

Communication Protocol

The MOSBUS RTU slave is implemented, available in most SCADA softwares in the

market.

The available Modbus commands are:

03 - Read Holding Register

16 - Write Multiple Registers

Each “03” (Read Holding Register) and “16” (Write Multiple Registers) command can

accept the reading/writing of up to 4 registers.

1.1 CONFIGURATION OF NC400-6

NC400-6 devices with RS485 serial communication interface will have the Addr

AddrAddr

Addres

eses

parameter in its Hardware Configuration cycle. This parameter must be set with the

Modbus address of the device on the communication bus. Each device must have a

unique address. Valid addresses must be between 1 and 247.

addr

addraddr

addres

eses

Device communication address. Each device must have a unique

address.

1.2 REGISTERS TABLE

Registers are internal parameters of the device. Each parameter of the table is a 16 bit

signed (two’s complement) word.

Holding

Registers

Parameter

0000

Main Counter

(HIGH)

Read: Main Counter, most significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0001

Main Counter

(LOW)

Read: Main Counter, less significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0002

Batch Counter

(HIGH)

Read: Batch Counter, most significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0003

Batch Counter

(LOW)

Read: Batch Counter, less significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0004

Totalizer

Counter

(HIGH)

Read: Totalizer Counter, most significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0005

Totalizer

Counter

(LOW)

Read: Totalizer Counter, less significant word

Write: Not allowed.

Format: Floating Point (IEEE-754)

0006

Set point 1

Main Counter

(HIGH)

Read: Set point 1 for the Main Counter, most significant word

Write: Set point 1 for the Main Counter, most significant word

Format: Floating Point (IEEE-754)

0007

Set point 1

Main Counter

(LOW)

Read: Set point 1 for the Main Counter, less significant word

Write: Set point 1 for the Main Counter, less significant word

Format: Floating Point (IEEE-754)

0008

Set point 2

Main Counter

(HIGH)

Read: Set point 2 for the Main Counter, most significant word

Write: Set point 2 for the Main Counter, most significant word

Format: Floating Point (IEEE-754)

0009

Set point 2

Main Counter

(LOW)

Read: Set point 2 for the Main Counter, less significant word

Write: Set point 2 for the Main Counter, less significant word

Format: Floating Point (IEEE-754)

0010

Set point

Batch Counter

(HIGH)

Read: Set point for the Batch Counter, most significant word

Write: Set point for the Batch Counter, most significant word

Format: Floating Point (IEEE-754)

0011

Set point

Batch Counter

(LOW)

Read: Set point for the Batch Counter, less significant word

Write: Set point for the Batch Counter, less significant word

Format: Floating Point (IEEE-754)

0012

Set point

Totalizer

Counter (HIGH)

Read: Set point for the Totalizer Counter, most significant word

Write: Set point for the Totalizer Counter, most significant word

Format: Floating Point (IEEE-754)

0013

Set point

Totalizer

Counter (LOW)

Read: Set point for the Totalizer Counter, less significant word

Write: Set point for the Totalizer Counter, less significant word

Format: Floating Point (IEEE-754)

0014

Status

Read: Output Status, Overflow, MAX and MIN.

Write: Not allowed.

Format: Binary

Bit - Function

0 - OUT1

1 - OUT2

2 - MAX (Main Counter)

3 - MAX (Batch Counter)

4 - MAX (Totalizer Counter)

5 - MIN (Main Counter)

6 - MIN (Batch Counter)

7 - MIN (Totalizer Counter)

8 - HOLD

9 - Overflow (Main Counter)

10 - Overflow (Batch Counter)

11 - Overflow (Totalizer Counter)

0015

Serial Number

(HIGH)

Read: Device serial number, most significant word

Write: Not allowed.

Format: Decimal

0016

Serial Number

(LOW)

Read: Device serial number, less significant word

Write: Not allowed.

Format: Decimal

Table 1 - Registers table

Note:

The Floating Point coding format used follows the standard IEEE-754 in mode

HIGH:LOW.

1.3 EXCEPTION RESPONSES – ERROR CONDITIONS

The MODBUS RTU protocol checks the CRC in the data blocks received

Reception errors are detected by the CRC, causing the controller to discard the packet,

not sending any reply to the master.

After receiving an error-free packet, the device processes the packet and verifies

whether the request is valid or not, sending back an exception error code in case of an

invalid request. Response frames containing error codes have the most significant bit of

the Modbus command set.

If a Write command sends an out-of-range value to a parameter, no write is done (the

parameter keeps the value it had before the command) and an Error Code 03 is

returned as a response.

The controller ignores broadcast READ commands; the controller processes only

broadcast WRITE commands.

Error Code Error Description

01 Invalid Command or noninexistent

02 Invalid Register Number or out of range

03 Invalid Register Quantity or out of range

Table 2 - Exception response error codes

NC400-6 1

Summary of Contents

Page 1 - NC400-6

NC400-6 Communication Protocol 1. SERIAL COMMUNICATION RS485 Interface • Compatible line signals with RS485 standard • 2 wire connection from maste

Comments to this Manuals

No comments

Novus NC400-6 User Manual

Browse online or download User Manual for Sensors Novus NC400-6. NOVUS NC400-6 User Manual

Summary of Contents

Comments to this Manuals

Related products and manuals for Sensors Novus NC400-6