7 Application Instructions API 50-99 2. STX/ETX setting function (M1126/M1130/D1124~D1126) is not supported. 3. High byte of 16-bit data is not available. Only low byte is valid for data communication. 4. Write the data to be transmitted in advance into registers starting from D100 and set M1312 (COM1 sending request) as ON 5. When X0 = ON, RS instruction executes and PLC is ready for communication. D100 will then start to send out 4 data continuously. When data sending is over, M1312 will be automatically reset. (DO NOT apply RST M1312 in program). After approximate 1ms, PLC will start to receive 7 data and store the data in 7 consecutive registers starting from D120. 6.
When data receiving is completed, M1314 will automatically be ON. When data processing on the received data is completed, M1314 has to be reset (OFF) and the PLC will be ready for communication again. However, DO NOT continuously execute RST M1314. M1002 Setting communication protocol as 9600,8,E,1 Retain communication protocol Pulse for sending request Set up communication time out as 100ms Pulse Write transmitting data in advance X0 Sending request M1314 Processing received data Receiving completed and flag reset Sending data: (PLC → External equipment) Source data register, starting from lower 8 bits of D100 Length = 4 Receving data:
(External equipment → PLC) DVP-PLC APPLICATION MANUAL 7-103 MOV H87 D1036 SET M1138 MOV K100 D1249 SET M1312 RS D100 K4 D120 K7 RST M1314 D100L D101L D102L D103L D120L D121L D122L D123L D124L D125L D126L Registers for received data, starting from lower 8 bits of D120 Length = 7