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50
MA 255
i
Le
u
ze electronic
Bit 7: New data: ND
10.3.3
Detailed description of the bits (output byte 1)
Bit 0: Read-Acknowledge: R-ACK
This bit is only relevant for writing slave data in blocks (Collective mode), see chapter 11.1.2.
Bit 2: Send data from buffer: SFB
This bit is only relevant for writing slave data in blocks (Collective mode), see chapter 11.1.2.
Output data
Description
Addr.
Data
type
Value range
Default
ND
N
ew
d
ata
This bit is needed if several identical pieces of data are to be
sent in sequence.
0.7
Bit
0->1; 1->0:
On each status
change for new data
0
Output data
Description
Addr.
Data
type
Value range
Default
R-ACK
R
ead-
Ack
nowledge
(read confirmation)
Toggle bit: Indicates to the fieldbus gateway that the "old"
data has been processed and that new data can be
received. At the end of a read cycle, this bit must be toggled
in order to be able to receive the next data set. This toggle
bit is switched by the master after valid received data has
been read out of the input bytes and the next datablock can
be requested. If the gateway detects a signal change in the
R-ACK bit, the next bytes are automatically written from the
receive buffer to the input data words and the BLR bit tog-
gled. Further toggling erases the memory (to 00h).
1.0
Bit
0->1 or
1->0: Successfully
written & ready for
the next
transmission
0
Output data
Description
Addr.
Data
type
Value range
Default
SFB
S
end
d
ata from
b
uffer
(send data from the gateway transmit buffer to the RS 232)
Toggle bit: changing this bit causes all data which was copied
to the transmit buffer of the fieldbus gateway via the CTB bit
to be transmitted to the RS 232 interface or the connected
Leuze device.
1.2
Bit
0->1: Data to
RS 232
1->0: Data to
RS 232
0
