Delta DVP-ES2/EX2/SS2/SA2/SX2/SE Field Name Data Hex, Example program of RS-485 communication

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

Step 6: Repeat step 2 – 5 until the operation of all the messages are completed. The final value obtained in the CRC register is the CRC checksum. Care should be taken when placing the LOW byte and HIGH byte of the obtained CRC checksum.

Example:

Read 2 continuous data stored in the registers of the drive at address 01H (see the table below). The start register is at address 2102H

Inquiry message:

Field Name	Data (Hex)
Address	01 H
Function	03 H
Start data	21 H
address	02 H
Number of data	00 H
(count by word)	02 H
CRC CHK Low	6F H
CRC CHK High	F7 H

Response message:

Field Name

Address

Function

Number of data (count by byte)

Content of data address

2102H

Content of data address

2103H

CRC CHK Low

CRC CHK High

Data (Hex)

01H

03H

04 H

17H

70H

00H

00H FE H 5C H

Example program of RS-485 communication:

M1002				D1120 Setting communication protocol 9600, 7, E, 1
		MOV	H86
		SET	M1120	Communication protocol latched
		MOV	K100	D1129	Setting communication time out 100ms
	Transmission
	request
X0
		Write transmitting data in advance
	Pulse
		SET	M1122	Sending request
X20
		RS	D100	K2	D120	K8

Receiving completed

M1123

Process of receiving data

RST M1123 Receiving completed and flag reset

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