Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Data sending and receiving will be started. When

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

Special register	Function
	The specific end word to be detected for RS instruction to execute an
D1168	interruption request (I150) on COM2 (RS-485).
	Supported communication instruction: RS
	For COM2 RS-485 MODRW instruction. D1256~D1295 store the sent
	data of MODRW instruction. When MODRW instruction sends out data,
D1256~D1295	the data will be stored in D1256~D1295. Users can check the sent data
	in these registers.
	Supported communication instruction: MODRW
	For COM2 RS-485 MODRW instruction. D1296~D1311 store the
D1296~D1311	converted hex data from D1070 ~ D1085 (ASCII). PLC automatically
	converts the received ASCII data in D1070 ~ D1085 into hex data.
	Supported communication instruction: MODRW

3.PLC COM3 RS-485:Associated flags (Auxiliary relays) and special registers (Special D) for communication instructions RS / MODRW and FWD / REV / STOP / RDST / RSTEF when M1177 = ON.

Flag	Function	Action
	COM3 retain communication settings. Communication settings will
	be reset (changed) according to the content in D1109 after every	User
	scan cycle. Users can set ON M1136 if the communication protocol	sets and
M1136		resets
	requires to be retained. When M1136 = ON, communication settings
	will not be reset (changed) when communication instructions are	User
	being processed, even if the content in D1109 is changed	sets and
		resets
M1320	COM3 ASCII / RTU mode selection. ON : RTU mode, OFF: ASCII
	mode.
	COM3 sending request. Before executing communication	User
	instructions, users need to set M1316 to ON by trigger pulse, so that
M1316		sets,
	the data sending and receiving will be started. When the	system
		resets
	communication is completed, PLC will reset M1316 automatically.
M1317	Data receiving ready. When M1317 is ON, PLC is ready for data	System
	receiving.	sets
		System
M1318	COM3 data receiving completed.	sets,
		user
		resets

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