Specifications

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C-12
C Buep 19e-Expander driver
It is the master´s task to set up the communication and to send orders to
the PLC. PCS and PLC communicate with the following settings: TTY or
RS-232C, 19200/9600/4800/1200 baud, 8 bit, EVEN parity, 1 stop bit.
Only the interchange of the packets is described in this manual. Refer to
the BOSCH „BUEP 19 transfer protocol“ manual for the structuring of the
packets.
Structure of the reading cycle:
PCS —— PLC
ENQ →
← ACK
READ DATA →
DB AREA
← ACK
EOT →
← ENQ
ACK →
← DATA THE DB AREA
ACK →
← EOT
Structure of the writing cycle:
PCS —— PLC
ENQ →
← ACK
WRITE DATA →
DB AREA
← ACK
EOT →
← ENQ
ACK →
← ORDER SUCCESSFULLY PERFORMED
ACK →
← EOT
The packets designated above as „data“ specific the real content of the
communication. These data are written into the receive buffer of the
communication data block of the programmable controller (write cycle)
and are processed by the communication program of the programmable
controller. Information is written into the send buffer in the communication
data block of the program-mable controller if the processing of the data
has been completed. This send buffer is read by the reading cycle. The
validity of an order is verified via an order number in the data. The send
and receive buffers use 138 bytes in a data block and are not adjustable
within this data block.