NAiS FP2, Техническое руководство

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6.6.1 Data to be Sent/Received with MCU
Remember the followings when accessing data in the MCU send and receive buffers:
•
If a header has been chosen in the communication format settings, the code STX (H02) will
automatically be added at the beginning of the data begin sent.
•
The data without the Code STX at the reception is stored in the receive buffer, and the “reception
done” flag turns on when the terminator is received.
However, if the code STX is added in the middle of the data, the data is stored from the beginning of
the receive buffer.
•
A terminator is automatically ad ded to the end of the data being sent.
•
There is no terminator on the d ata stored in the receive buffer.
Sending data:
Data written to the send buffer will be sent just as it is.
Example:
The data “12345” is transmitted as an ASCII code to a device with RS232C port.
1. Data sent using the F95 (ASC) instruction should be converted to ASCII code data.
2. If DT100 is being used as the send buffer, data will be stored in sequential order in the data registers
starting from the next register (DT101), in two-byte units consisting of the upper and the lower byte.
Receiving data:
Data received using F161 (MRCV) instruction will be copied as it is and stored in specified data registers.
Example:
The data “12345
C
R
” is transmitted from a device with RS232C port.
•
If DT200 is being used as the b eginning of the receive buffer, received data will be stored in the
registers starting from DT201, in sequential order of first the lower byte and then the upper byte.