Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Points to note, Flag Function Action

3. Instruction Set

Sending data: (PLC→External equipment)

D100L D101L D102L D103L

Source data register, starting from lower 8 bits of D100

Length = 4

Receving data: (External equipment→PLC)

D120L D121L D122L D123L D124L D125L D126L

Registers for received data, starting from lower 8 bits of D120

Length = 7

Points to note:

1.PLC COM1 RS-232:Associated flags (Auxiliary relays) and special registers (Special D) for communication instructions RS / MODRD

Flag	Function	Action
	COM1 retain communication settings. Communication settings will be
	reset (changed) according to the content in D1036 after every scan
	cycle. Users can set ON M1138 if the communication protocol	User
	requires to be retained. When M1138 = ON, communication settings
M1138		sets and
	will not be reset (changed) when communication instructions are	resets
	being processed, even if the content in D1036 is changed.
	Supported communication instructions: RS / MODRW
	COM1 ASCII / RTU mode selection, ON: RTU mode, OFF: ASCII	User
	mode.
M1139		sets and
	Supported communication instructions: RS / MODRW	resets
	COM1 sending request. Before executing communication instructions,
	users need to set M1312 to ON by trigger pulse, so that the data	User
M1312	sending and receiving will be started. When the communication is	sets and
		system
	completed, PLC will reset M1312 automatically.
		resets
	Supported communication instructions: RS / MODRW
	COM1 data receiving ready. When M1313 is ON, PLC is ready for
M1313	data receiving	System
	Supported communication instructions: RS / MODRW

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