BL20 - Communication in CANopen
D301087 0308 - BL20 CANopen4-170
Table 107:
Meaning of the
data bits for
RS232/485-
modules
Designation Value Description
STAT 0-1 1: Communication with the data
terminal device is OK.
0: Communication with the data
terminal device is faulty. A diagnos-
tics signal is sent if DisableDiagnos-
tics = 0 (diagnostics activated). The
diagnostics data indicates the cause
of the communication fault.
This bit must be reset by the user with
STATRES in the process output data
field (object 5602
hex
).
TX_CNT_ACK 0-3 The value TX_CNT_ACK is a copy of
the value TX_CNT. The value TX_CNT
was transferred together with the last
data segment of the process output
data.
The value TX_CNT_ACK is a confir-
mation of successful acceptance of
the data segment using TX_CNT.
RX_CNT 0-3 The value RX_CNT is linked and
transferred together with every data
segment of the process input data.
The sequence of the RX_CNT values
is:
00->01->10->11->00...
(decimal: 0->1->2->3->0...)
A faulty sequence indicates that data
segments are missing.
RX_BYTE_CNT 0-7 Number of valid bytes in this data
segment.
BufOvfl Bit 7 0 = ok
1 = Buffer overflow
The receive buffer (RX buffer) has
overflowed.
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