Dwyer SCD Manuale Utente Scaricare il pdf (Pagina 10)

RTU Mode:

To Read Instruction

To Read Response

Message

To Write Instruction

To Write Response

Message

Machine address

01H

Machine

address

01H

Machine

address

01H

Machine

address

01H

Instruction 03H

01H

Instruction 03H

01H

Instruction

06H

05H

Instruction 06H

05H

10H

08H

10H

08H

10H

08H

Starting address of

reading data

00H

10H

Response data

length (byte)

04H

02H

To write

data

address

01H

10H

To write data

address

01H

10H

00H

01H

17H

03H

FFH

03H

FFH

To read data length

(word/bit)

02H

09H

Data content 1

F4H

01H

To write

data

content

20H

00H

To write data

content

20H

00H

CRC low byte

C0H

BBH

03H

CRC low

byte

DDH

8FH

CRC low byte

DDH

8FH

CRC high byte

CBH

A9H

Data content 2

20H

CRC high

byte

E2H

9FH

CRC high byte

E2H

9FH

CRC low byte

BBH

77H

CRC high byte

15H

88H

CRC (Cyclical Redundancy Check) program example:

unsigned int reg_crc = 0xffff; i = 0;

while (length--)

{

reg_crc ^= RTUData[i];

i ++;

for (j = 0; j < 8; j++)

{

if (reg_crc & 0x01) reg_crc = (reg_crc >> 1) ^ 0xA001;

else reg_crc = reg_crc >> 1;

}

return (reg_crc);

INSTALLATION

SCD series can be extended up to 8 modules and installed by DIN rail mounting.

SCD unit

Mounting Panel

DIN rail

HOW TO SET UP CURRENT INPUT

For normal input

For current input (4 ~ 20mA, 0 ~ 20mA)

JUMPER

PIN HEADER

JP1

DEFAULT SETTING

JUMPER

PIN HEADER

JP1

1 2 3 4 5 6 7 8 9 10

Commenti su questo manuale

Nessun commento

Dwyer SCD Manuale Utente Pagina 10

Commenti su questo manuale

Prodotti e manuali riguardandi Sensori Dwyer SCD