Delta AS Series Programming Manual page 947

AS Ser ies Pro gra mm in g M anu al
Example 8
The mode in D is 7 (the data received ends with a specific character and generates communication interrupts) and you
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set the mode of sending and receiving data to 8-bit mode (SM106=ON).
Communication interrupt programs:
1. Clear the interrupt: D30=0.
2. The length for the data to be sent: D20=4.
3. The contents for the data to be sent: D100=16#0031, D101=16#0032, D102=16#0033, D103=16#0034.
4. Set D10=16#0007 (mode: 7), D11=16#000A (16#0A is the ending character).
5. Enable the contact X0.0.
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6. The PLC sends out 4 pieces of data.
Sending data: PLC→external equipment 31 32 33 34
7. D30=0 (the programs in the interrupt are not executed).
8. The external equipment sends data to the PLC.
External equipment → PLC 31 32 33 34 35 0A
9. D200=6 (number of the data received), and the content of the received data: D201=16#0031, D202=16#0032,
D203=16#0033, D201=16#0034, D202=16#0035, D203=16#000A.
10. SM100=ON: reception of data is complete.
11. D30=1 (the interrupt is triggered and then INC D30 is executed).
12. To send more data, set the flag SM100 to OFF to start the operation again.
NOTE: When the data sending is complete, the receiving flag SM98 is ON and then the PLC is ready to receive data.
When receiving the set ending character (16#06), SM100 is ON. If the communication timeout occurs but the set
ending character is still not received, the communication timeout flag SM104 is ON.
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