Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual COM Port I10 interrupt Special D, COM1, COM2, Data

3. Instruction Set

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	Communication address:
Address Lo	The 8-bit address consists of 2 ASCII codes
Function Hi	Function code:
Function Lo	The 8-bit function code consists of 2 ASCII codes
DATA (n-1)	Data content:
…….
	n × 8-bit data content consists of 2n ASCll codes
DATA 0
LRC CHK Hi	LRC check sum:
LRC CHK Lo	8-bit check sum consists of 2 ASCll code
END Hi	End word:
END Lo	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’
ASCII code	30H	31H	32H
Character	‘8’	‘9’	‘A’
ASCII code	38H	39H	41H

Start word (STX): ‘: ’ (3AH) Address:

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

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

‘3’

33H

‘B’

42H

‘4’	‘5’	‘6’	‘7’
34H	35H	36H	37H
‘C’	‘D’	‘E’	‘F’
43H	44H	45H	46H

3 - 2 2 1