Delta Electronics DTC1000R User Manual download pdf (Page 12)

To Read Instruction To Read Response

Message

To Write Instruction To Write Response

Message

Machine

address

01H 01H

Machine

address

01H 01H

Machine

address

01H 01H

Machine

address

01H 01H

Instruction

03H 02H

Instruction

03H 02H

Instruction

06H 05H

Instruction

06H 05H

10H 08H 10H 08H 10H 08HStarting

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 00H 01H 17H 03H FFH 03H FFHTo read

data length

(word/bit)

02H 09H

Data content

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

20H CRC high

byte

E2H 9FH CRC high

byte

E2H 9FH

CRC low

byte

BBH 77H

CRC high

byte

15H 88H

Following is a 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);

11 INSTALLATION

DTC modules can be expanded up to 8, and installed with DIN rail mounting

Delta Electronics, Inc. 31-1 Shien Pan Road, Kuei San Industrial Park, Taoyuan Shien 33341, Taiwan, R.O.C.

TEL: 886-3-362-6301 FAX: 886-3-362-7267

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Delta Electronics DTC1000R User Manual Page 12

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