Delta DVP-ES2 User Manual download pdf (Page 337)

100

101

3. Instruction Set

3-221

Value Error Description

H0005 Communication data length error

9. Corresponding table between D1167~D1169 and the associated interrupt pointers. (Only

lower 8 bits are valid)

COM Port

I1□0 interrupt

Special D

COM1 I140 D1167

COM2 I150 D1168

COM3 I160 D1169

10. Take standard MODBUS format for example:

ASCII mode

Field Name Descriptions

STX Start word = ‘: ’ (3AH)

Address Hi

Address Lo

Communication address:

The 8-bit address consists of 2 ASCII codes

Function Hi

Function Lo

Function code:

The 8-bit function code consists of 2 ASCII codes

DATA (n-1)

…….

DATA 0

Data content:

n × 8-bit data content consists of 2n ASCll codes

LRC CHK Hi

LRC CHK Lo

LRC check sum:

8-bit check sum consists of 2 ASCll code

END Hi

END Lo

End word:

END Hi = CR (0DH), END Lo = LF(0AH)

The communication protocol is in Modbus ASCII mode, i.e. every byte is composed of 2 ASCII

characters. For example, 64Hex is ‘64’ in ASCII, composed by ‘6’ (36Hex) and ‘4’ (34Hex). Every

character ‘0’…’9’, ‘A’…’F’ corresponds to an ASCII code.

Character ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’

ASCII code 30H 31H 32H 33H 34H 35H 36H 37H

Character ‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’

ASCII code 38H 39H 41H 42H 43H 44H 45H 46H

Start word (STX): ‘: ’ (3AH)

Address:

‘0’ ‘0’: Broadcasting to all drives (Broadcast)

‘0’ ‘1’: toward the drive at address 01

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Delta DVP-ES2 User Manual Page 337

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