Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Ascii Mode M1143 = OFF, Modrw

3. Instruction Set

3.In ASCII or RTU mode, when PLC’s COM2 sends out data, the data will be stored in D1256~D1295. The feedback data will be stored in registers starting with S and converted into D1296~D1311 in Hex automatically.

4.Take the connection between PLC1 (PLC COM2) and PLC2(PLC COM1) for example, the tables below explains the status when PLC1 reads Y0~Y17 of PLC2.

M1002				D1120 Set communication protocol as 9600, 8, E, 1
		MOV	H87
		SET	M1120	Retain communication protocol
		MOV	K100	D1129 Set communication timeout as 100ms						M1143 = ON
		RST	M1143	M1143 = OFF			SET	M1143
	X0			ASCII mode						RTU mode
			M1122	Sending request
		SET
X0				K2	H0500	D0	K16
		MODRW	K1						Data length (bit)
									Data storing register
									Data address Y0=H0500
									Function code K2
									read multiple bits
Receiving completed									Connection device
M1127									address K1
		Processing received data

ASCII mode: The received data is stored in registers starting from D0 in ASCII format and PLC converts the content to registers D1296~D1311 in hexadecimal automatically.

RTU mode: The received data is stored in registers starting from D0 in Hex.

RST M1127 Reset M1127

ASCII Mode (M1143 = OFF):

When X0 = ON, MODRW instruction executes the function specified by Function Code 02. PLC1Ö PLC2，PLC1 sends: “01 02 0500 0010 E8”

PLC2 ÖPLC1，PLC1 receives: “01 02 02 3412 B5”

Registers for data to be sent (sending messages)

Register		Data			Descriptions
D1256 Low		‘0’	30 H	ADR 1	Device address: ADR (1,0)
D1256	High	‘1’	31 H	ADR 0
D1257 Low		‘0’	30 H	CMD 1	Control parameter: CMD (1,0)
D1257 High		‘2’	32 H	CMD 0
D1258	Low	‘0’	30 H
D1258	High	‘5’	35 H	Y0 = H0500
D1259	Low	‘0’	30 H	Starting Data Address
D1259	High	‘0’	30 H

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