Specifications

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B-11
B Buep 19-Expander driver
The tasks are listed below in detail:
TASK PRIOR. LENGTH START CRITERION
1. Write keyboard status 8 3 When pressing or releasing a key
2. Reset message bit 7 2 Press CLR for delete behavior 2
3. Write PLC setpiont 6 2..3 Always after changing a setpoint variable
and leaving the entry field
4. Read actual values 5 2..24*) In priorities 0..6, 12 continuously, other-
wise when display is refreshed
5. Read message bits 4 9 max. Continuously
6. Send PCS status 4 5 After changes
7. Read LEDs, flashing 3 4 Continuously
LEDs, memory and
display behavior
8. Read command word 3 3 Continuously (menu selections only if the
temporary buffer is empty)
*) Depends on the number of variables displayed and if the addresses
are adjacent. If the addresses are not adjacent, one header is required
per non-adjacent variable (1 word).
Data transfer procedure When communicating with each other the PCS operates as master (AST).
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.