Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Communications

Communications

This chapter introduces information regarding the communications ports of the PLC. Through this chapter, the user can obtain a full understanding about PLC communication ports.

Chapter Contents

4.1	Communication Ports		4-2
4.2	Communication Protocol ASCII mode		4-3
	4.2.1	ADR (Communication Address)	4-3
	4.2.2 CMD (Command code) and DATA		4-3
	4.2.3	LRC CHK (checksum)	4-5

4.3 Communication Protocol RTU mode		4-7
4.3.1	Address (Communication Address)	4-7
4.3.2 CMD (Command code) and DATA		4-8
4.3.3	CRC CHK (check sum)	4-9

4.4	PLC Device Address	4-11
4.5	Command Code	4-13
	4.5.1 Command Code: 01, Read Status of Contact (Input point X is not included)	4-13
	4.5.2 Command Code: 02, Read Status of Contact (Input point X is included)	4-14
	4.5.3 Command Code: 03, Read Content of Register (T, C, D)	4-15
	4.5.4 Command Code: 05, Force ON/OFF single contact	4-16
	4.5.5 Command Code: 06, Set content of single register	4-17
	4.5.6 Command Code: 15, Force ON/OFF multiple contacts	4-18
	4.5.7 Command Code: 16, Set content of multiple registers	4-18

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