Panasonic FPS Series, User Manual

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FP Σ User's Manual
8.6 Program Controlled Communication
191
POU Header and LD Body
ST Body
When the variable bSend is set to TRUE, the function F10_BKMV copies the characters of
the string sSendData to the buffer awSendBuffer beginning at awSendBuffer[1] .
The first two words of a string contain the string header information (maximum number of
characters and the current number of characters). The string header must not be copied into
the buffer. Therefore, enter an offset of 2 to the starting address of the string before copying
the data.
Make sure that the send buffer is big enough for all the data to be sent. To determine its size
you must take into account that two characters of the string
SendString can be copied into
each element of the array SendBuffer . SendBuffer[0] is reserved for the total number of
bytes to be sent by F159_MTRN.
3. Sending the data using the instruction F159_MTRN
Execute F159_MTRN to
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specify the amount of data to be sent
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specify the communication port to be used
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output the data from the communication port to the external device.
When the execution condition of F159_MTRN turns to TRUE and the "transmission done" flag
is TRUE, transmission starts. (For details on flag operation, see page 198.)
When sending data, operation is as follows:
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The number of bytes to be sent is set in offset 0 of the send buffer.
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The "transmission done" flag turns to FALSE.
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The data in the send buffer is sent starting with the low order byte in offset 1.
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The start and end codes specified in the system registers are automatically added
to the data sent.
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During transmission, F159_MTRN cannot be executed again.