
9–5Diagnostic Counters
Publication
17706.5.16 - October 1996
1747L541, L542, and L543 (SLC 5/03 and 5/04 processors)
DH485 Diagnostic Counters
This counter byte Counts the number of
0 Total message packets received, low byte
1 Total message packets received, high byte
2 Total message packets sent, low byte
3 Total message packets sent, high byte
4 Message packet retries
5 Retry limit exceeded
6 NAK, no memory sent
7 NAK, no memory received
8 Total bad message packets received
9 Bad messages due to illegal type (i.e., control byte bad)
10 Bad messages due to bad CRC
11 Bad messages due to character with parity error
12 Bad messages due to character with framing error
13 Bad messages due to overrun error
14
Number of unexpected characters received
À
À
If
this counter is not zero, it could indicate that an internal hardware problem has occurred. This
problem could be that the communication channel's receiver has been disabled, but the DH485
driver is still receiving characters. If the controller is operating properly, this counter should remain
at zero.
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