2VV IC-ModBus Manuale di installazione e assistenza - Pagina 8

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7. CONTROL

7.1. COMMUNICATION PROTOCOL - MODBUS RTU

*Address of module 0x01

Operational parameters of communication line RS485 MODBUS (RTU):

9600Bd

1 start bit

8 data bits

1 bit even parity

1 stop bit

Each module must support even parity. If parity is not used, it is replaced by second stop bit.

Communication method:

Master – control system (BMS)

Slave – electronics Module D (Modbus module)

Only the control system can be connected.

After the first connection of power supply, the module is in the OFF state. The requested operational mode must be sent by the superior control system! After

the subsequent disconnection of the power supply, the module remembers its last operational mode.

Communication connector numbers:

A - 6

B - 7

GND - 8

MODBUS RTU:

In the RTU mode, every 8-bit byte of message contains two 4-bit hexadecimal characters. The transmission of a message must be continuous, the spaces

between the characters must not be longer than 1.5 character. The beginning and end of the message is identified according to the bus rest longer than 3.5

character. The RTU frame format is shown in the picture.

General structure of telegram [hex]:

Beginning

> 3.5 characters

Data block length

Size of ADU on RS-485 = 253 bytes PDU + address(1 byte) + CRC (2 bytes) = 256 bytes

Address

Master has not any specific address, only slave units have to have an address unique in all MODBUS site.

CRC

Field with generating polynom x16 + x15 + x2 + 1.

7.2. TABLE OF KEY CHARACTERS AND CONFIGURATION DATA

Factory Driver:

Intended for hardware setup (READ/WRITE)

Address

10001

10002

10003

10004

10005

10006

At the IC-ModBus regulator, it is necessary to always set AC5 on address 10001 (five-degree module)

Address

Function

8 bits

Name

Factory set register - without valid FactoryPass only read

0 - AC3

AC_Switch

1 - AC5

MaxFlowManual

% of fan power

MinFlowManual

% of fan power

0 - none

Postheat_1

1 - electric

2 - water

0 - PWM

MotorEC_set

1 - analog (0-10V)

0 - non

TempEXT1

1 - used

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Data

CRC

N * 8 bits

16 bits

Info

Min. Value

End

> 3.5 characters

Max. Value

Default

100