Product Description XI/ON - Eaton Automation

XI/ON: Gateways for Modbus TCP 5 Implementation of Modbus TCP
Table 13:
results of the
service request
A service request may have the following results:
Service code Meaning
0×0000 error free execution of service
0×FFFE service parameters
incorrect/ inconsistent
0×FFFF service code unknown
Note
The services "indirect reading of registers" and "indirect writing of
registers" offer an additional possibility to access any Modbus
register.
Current Modbus-masters support only a limited number of registerareas
that can be read or written during the communication with a
Modbus-server. These areas can not be changed during operation.
In this case, the services mentioned above enables non-cyclic access
to registers.
5.6.1 Indirect reading of registers
1 to 122 (Count) Modbus-registers are read, starting with address
x (Addr).
service-request
2000h 2001h 2002h 2003h 2004h 2005h 207Fh
service
no.
service-response
0×0000 0×0003 Addr Count reserved
2080h 2081h 2082h 2083h 2084h 2085h 20FFh
service
no.
result 0×0003 Addr Count register contents
78 M001973-01, 07/2007