
Appendix E
DL305 Memory Map
E–3
DL305 Data Types and Memory Map
You can use Data Type 39 to obtain DirectNET diagnostic status. The only valid
address for the DL305 products is 0000 (hex). There are 5 status words that can be
read or cleared. You must access these words as a complete group. The following
tables show the reference addresses for the various types of information and the
DirectNET error codes (used for word 1).
Address Read/Write Word Diagnostic Status
0000 (h) Read
Write 0
1 Last error and previous error*
Previous error code
Write 0
(to clear)
2 Number of successful communications
3 Number of erroneous communications
4 Number of retries for header
5 Number of retries for data
* The last error code is contained in the most significant byte. The previous
error code is in the least significant byte. Two codes that are displayed are
cleared by two successful communication exchanges.
Data Type 39
Diagnostic Status
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