Specifications

1070 072 131-102 (96.08) GB
BUEP03E Protocol8-2
8.3 Explanation of Terms
UART Receive buffer: The R500 operating system reads all the charac-
ters into this 384-byte buffer via the serial interface. This receive buffer is
located on the R500 module.
BÜP03E Receive buffer: The BÜP03E reads the characters from the
UART receive buffer and writes them to its own BÜP03E receive buffer,
the size of which can be selected from 10 to 256 bytes. This receive buf-
fer is located on the R500 module.
PLC Receive buffer: This receive buffer, defined by the user on the PLC
side, accepts the contents from the BÜP03E receive buffer. This buffer is
therefore the same size. This receive buffer is located on the central
processing unit.
Unrestricted Receive: The Receive process receives all characters and
writes them to the designated Receive buffer; no conditions are taken into
account. The Receive process can be concluded with the monitoring-time
overflow or stopped via the Terminate Job command.
Conditional Receive: The receive process can take account of the con-
ditions with regard to start and end identifiers, termination characters, Re-
ceive-data length and monitoring time. The characters are accepted only
under the preset conditions. The Receive process can be ended by end
identifier(s), Receive-data length or monitoring time, or terminated by ter-
mination character or aTerminate Job command.
Receive Mode: The receive features, e.g. start, end identifiers, cancel
criteria, data length, number of BCC, etc.
Ring buffer: For the intermediate storage of data. The ring buffer is ma-
naged by RD and WR pointers. The WR pointer is counted up to the end
of the ring buffer and is then placed at the start of the ring buffer. If the
RD pointer stops counting due to data being read out previously, the RD
pointer may be overtaken by the WR pointer.
RD pointer: For reading out the data from the ring buffer.
WR pointer: For writing the data to the ring buffer.
User pointer: Situated in the first word of the PLC Receive buffer. It indi-
cates the relative position of the character which was received last.
Job parameter list: Specifies command parameters and is addressed by
R5REQ parameters P0 - P2.
Command chain: Links several commands with the Start command via
the command position number.