Diagnostic Registers - HMS Anybus X-gateway User Manual

Diagnostic Registers

Due to the fact that many Modbus devices do not support the diagnostic functions
(function 8), the diagnostic information has been made available at a special range
of register addresses to allow it to be accessed using the register read and write
functions. Every operation that is available through the function 8 interface is also
available using common register functions.
Note: Do not confuse these registers with the J1939 diagnostic tables. These reg-
isters contain diagnostics for the module itself and its network interfaces.
Note: The Swap I/O Bytes option does not have any effect on the diagnostic and
status registers. All diagnostic and status registers are in little endian format.
The following register addresses are defined to retrieve diagnostic information
from the JMI. They can be read using Modbus function 4.
functions" on page 4-3 for an explanation of each diagnostic value.
Register
32001
32002
32003
32004
32005
32006
32007
32008
32009
32010
32011
32012
© 2012 HMS Industrial Networks AB
Modbus diagnostic register.
Modbus bus message counter.
Modbus communication error counter.
Modbus exception response counter.
Modbus slave message counter.
Modbus no response counter.
Modbus receive overrun counter.
J1939 status register.
J1939 fault register.
J1939 CAN error counter.
J1939 CAN bus-off counter.
J1939 CAN receive overrun counter.
Table 4-7 Input Register Addresses for Diagnostics
Modbus Interface 4-9
See "Diagnostic Sub-
Description
Doc.Id. HMSI-168-25