Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 129)

Chapter 8
Host Commands Using the RS-485 Interface
8–17
Read Diagnostic Status - Seven diagnostic status parameters can be read:
1) Mode/Status (00) (1 byte)
2) Extender Type (EE hex) (1 byte)
3) Interface Type (22 hex) (1 byte)
4) Processor Type (21 hex) (1 byte)
5) Series/Revision (00) (1 byte)
6) Bulletin Number/Name (ASCII) (11 bytes)
7) Product Information (unused) (8 bytes)
The read diagnostic status reply message has the following organization.
Characters in quotes ‘ ’ are ASCII equivalent characters all other values are
hexadecimal.
READ DIAGNOSTIC STATUS REPLY
00000000 01000110
TRANSACTION WORD
HI Byte LOW Byte
EE 00
21 22
‘2’ 00
‘5’ ‘7’
‘-’ ‘5’
‘M’ ‘D’
0 ‘9’
20 20
20
Next eight bytes = 00
The Reply (Byte 0) is a value of 46 (hex).
The Status (Byte 1) is listed in Table 8.D
The Transaction Word (Bytes 2 & 3) are returned the same as sent in the read
command.
The Mode/Status (Byte 4) is unused. A value of 00 (hex) will be returned.
The Extender Type (Byte 5) is unused. A value of EE (hex) will be returned.
The Interface Type (Byte 6) will be returned as a value of 22 (hex).
The Processor Type (Byte 7) will be returned as a value of 21 (hex).
The Series/Revision (Byte 8) indicates the decoder series and revision levels.
The first three most significant bits indicate the series and the five other bits
indicate the revision. A value of 0 (hex) = A, 1 (hex) = B, etc. For
example:
Read Diagnostic Status Reply