Specifications

1070 072 131-102 (96.08) GB
BUEP03E Protocol 8-9
8.6.3 PLC Receive Buffer
The PLC Receive buffer is the same as the BÜP03E Receive buffer. The
received data is collected in this buffer and is provided to the user for in-
terpretation.
The Data Copy command writes all the data which is in the BÜP03E Re-
ceive buffer into the PLC Receive buffer in one cycle.
8.6.4 Data Exchange Between Receive Buffers
The previous section explained in detail the internal design and manage-
ment of the three Receive buffers (UART, BÜP03E, and PLC Receive
buffers). This section describes how data exchange and data flow has
been organised.
*User pointer *RD pointer Character 1 RD pointer
Character 1 Character 2
‘’ *WR pointer ‘’ WR pointer
Character n Character n
Character
n+1
Character
n+1
V24
BÜP03 Receive
buffer
UART Receive
buffer
/Data
20 mA
System bus HW interface
Transmit
data
*User pointer
Character 1
‘’
Character n
Character
n+1
PLC Receive
buffer
Fig. 8-5 BÜP03E — Data exchange between Receive buffers
The characters in the UART Receive buffer are read into the BÜP03E
Receive buffer character by character. The user can use Data Copy to
read all the data which is in the BÜP03E Receive buffer into the PLC Re-
ceive buffer.
The Transmit command defines a transmit area on the PLC side.
BÜP03E reads this transmit area into a transmit buffer and transmits the
data out of this buffer to the serial interface.