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RS232,TTY,RS485 750-650,651,653
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The PLC is able to control transmission and reception of data by means of the control
byte and the status byte.
Initialization of the module:
• set IR in the control byte
• transmit/receive functions are blocked
• output/input buffers are erased
• serial interface module will load its configuration data
Transmitting data:
• TR≠TA: put characters into output byte 0 to 2
• amount of characters is specified in OL0 to OL2
• TR is inverted and read out
• characters are put into output buffer if TR=TA
Receiving data:
• RR≠RA: in input byte 0 to 2 characters are available
• amount of characters is specified in IL0 to IL2
• charactersin IL0 to IL2 are read out
• RA is inverted and read out
• all characters are read when RR=RA
The transmitting and receiving of data can be done simultaneously. The initialization
request has prioirity and will stop transmitting and receiving of data immediately.
Message: input buffer full (Bit 3)
Input buffer is full. Data which are received now are lost.