Error Messages; Modbus Error Codes - JUMO LOGOSCREEN nt Interface Description

Example 1

4.9 Error messages

4.9.1 Modbus error codes

No response
from the
recorder
Error codes
Request status of relay output 1.
Instruction: read one word from address 0x1631
01 03 1631
Response (CRC = 0x8479):
01 03 02
Word 1
Word 1 = 1 indicates that relay 1 is active.
The slave will not respond if one of the following errors occurs:
- the baud rate or data format for the master (PC or notebook) does not
match the slave (paperless recorder)
- the device address for the recorder does not match the address contained
in the protocol
- the checksum (CRC16) is not correct
- the instruction from the master is incomplete or over-defined
- the number of words to be read is zero
In these cases, when the time-out of 2seconds has expired,
the data will have to be retransmitted.
If the data request from the master is received by the paperless recorder
without any transmission error, but cannot be processed, then the recorder will
answer with an error code.
The following error codes may appear:
- 01 invalid error code
- 02 invalid address or
too many words or bits to be read or written
- 03 value is outside the permitted range
- 08 write-protected value
4 Modbus protocol description
0001 D18D
0001 7984
25