NOVUS N321S Differential Temperature Controller Instruction Manual

NOVUS N321S Differential Temperature Controller

SERIAL COMMUNICATION

RS485 Interface

• Compatible line signals with RS485 standard.
• 2 wire connection between master and up to 31 slave controllers in bus topology.
• With multiple output converters up to 247 knots.
• Maximum communication distance: 1000 meters.
• The RS485 signals are:

General Characteristics

• Serial interface not isolated from input circuitry.
• Serial interface isolated from input circuitry, except in 24 V powered model.
• Baud rate : 9600 bps.
• Data Bits : 8.
• Parity : None.
• Stop Bits : 1.

Communication Protocol
Modbus RTU slave protocol is supported, available in most of the supervisory software found in the market.

The available Modbus commands are as follows:

• 03 – Read Holding Register (Record Readers)
• 06 – Preset Single Register (Written in Recorder)

The 03 Read Holding Register command accepts the reading of up to four consecutive registers.

CONTROLLER CONFIGURATION

Controllers that have the built-in RS485 serial communication interface have the Addr parameter at their programming level. In this parameter the user defines a communication address for each element of the network. The address you set must be between 1 and 247 Communication address of the controller. Each controller must have a unique address

REGISTERS TABLE

The registers are the controller’s internal parameters. Each table parameter is a 16-bit word with a signal represented by a complement of 2.

Holding

Registers

|

Parameter

|

Registers Description

---|---|---

0000

|

Value T1

| Reading: Measured temperature value T1. Writing: Not allowed.

Range: According to the sensor type used.

0001

|

Value T2

| Reading: Measured temperature value T2. Writing: Not allowed.

Range: According to the sensor type used.

0002

|

DIF

| Reading: Value of T1-T2.

Writing: Not allowed.

0003

|

D0n

| Reading: Differential setpoint for activating the pump. Writing: Differential setpoint for activating the pump.

Range: Adjustable from d0f to 20 °C.

0004

|

d0f

| Reading: Differential setpoint for deactivating the pump. Writing: Differential setpoint for deactivating the pump.

Range: Adjustable between 1 °C and D0n.

0005

|

IND

| Reading: Temperature value exhibited on the display. Writing:

0 Temperature of the collectors (T1);

1 Temperature of the storage tank (T2);

2 Temperature difference between the sensors (T1 – T2);

3 Alternates the indication of T1, T2 and T1-T2 at every 3 seconds.

---|---|---

0006

|

Serial Number High

| Reading: First 3 digits of the controller serial number. Writing: Not allowed.

Screen number format: XXXXh.

0007

|

Serial Number Low

| Reading: Last 3 digits of the controller serial number. Writing: Not allowed.

Screen number format: XXXXh.

0008

|

I[E

| Reading: Anti-frost temperature setpoint. Writing: Low temperature setpoint.

Range: Adjustable between spl and spk.

0009

|

KT1

| Reading: Temperature setpoint T1 overheating. Writing: Temperature setpoint T1 overheating.

Range: Adjustable between spl and spk.

0010

|

KT2

| Reading: Temperature setpoint T2 critical maximum in the tank.

Writing: Temperature setpoint T2 critical maximum in the tank. Range: Adjustable between spl and spk.

0011

|

KYS

| Reading: Anti-frost temperature T1 hysteresis ( i(e ). In degrees.

Range: Adjustable between 0.1 and 50.0 °C.

0012

|

KY1

| Reading: Hysteresis of the overheating temperature T1 ( kt1 ). In degrees.

Range: Adjustable between 0.1 and 50.0 °C.

0013

|

KY2

| Reading: Hysteresis of the overheating temperature T2 ( kt2 ). In degrees.

Range: Adjustable between 0.1 and 50.0 °C.

0014

|

Ik m Status

| Reading: IHM status. Writing: Not allowed. Value format:

bit 0 – Status P1 (OUT1); bit 1 – Status P2 (OUT2);

bit 2 – True when PV is showing;

bit 3 – True when command is received by the serial; bit 4 – Internal control;

bit 5 – Status Led T1;

bit 6 – Status Led defrost; bit 7 – Status Led T2;

bit 8 – Internal control; bit 9 – Internal control;

bit 10 – True if the Value has decimal point; bit 11 – Internal control;

bit 12 – Internal control; bit 13 – Internal control; bit 14 – Internal control;

bit 15 – Internal control.

0015

|

Control Status

| Reading: Measurement status.

Writing: Not allowed.

0016

| Value of Displayed Screen| Reading: Screen parameter value shown. Writing: Not allowed.

Maximum range: -199 a 999. The range depends on the parameter being displayed on the screen.

0017

|

Version Screen N°

| Reading: Version of the software implemented in the controller and number of the current screen.

Writing: Not allowed.

Screen number formation: XXYYh, where: XX ® Version and YY ® Screen number.

---|---|---

0018

|

OF1

| Reading: Offset value for sensor 1 measurement. Writing: Offset value for sensor 1 measurement.

Range: -10,0 to 10,0 °C.

0019

|

OF2

| Reading: Offset value for sensor 2 measurement. Writing: Offset value for sensor 2 measurement.

Range: -10,0 to 10,0 °C.

0020

|

I[E ,

KT1 and KT2

Status

| Reading: Status de ICE, HT1 e HT2. Writing: Not allowed.

Value format: BIT 0 – ICE BIT 1 – HT1

BIT 2 – HT2

0021| SP1| Support Setpoint Value.
0022| B1y| Support output hysteresis value.
0023| A[1| Support output control action.

Notes : The SP, PV and Hysteresis values are always multiplied by 10 to account for the decimal point

EXCEPTION RESPONSES – ERROR CONDITIONS

Upon receiving a command, the CRC check is performed on the received data block. If there is a CRC error at reception, no response will be sent to the master. For commands received without error, a consistency of the command and the requested registers is realized. If invalid, an exception response is sent with the corresponding error code. In exception responses, the field corresponding to the Modbus command in the response is summed as 80h. If a value write command in a parameter has a value outside the allowed range, no value will be written to this parameter, returning error code 03 as a response. Broadcast read commands are ignored by the controller and there is no response. You can only write in Broadcast mode.

ELECTRICAL CONNECTIONS

Characteristics of the Physical Environment

• Twisted pair cable, shielded, 3 x 24 AWG and grounded wire at both ends;
• 16 pF of capacitance every 30 m in length;
• 100 Ohms characteristic impedance;
• 1000 m maximum length

N321S model connections

N322S model connections

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