Loopback/Maintenance (Fn=8); Preset Multiple Registers (Fn=16); Error Responses (Fn= +128) - Toptech MultiLoad II Manual

Chapter 1 – Protocol Specification
1.5.3 L /M
OOPBACK AINTENANCE
Note: only loopback of command supported.
Tx:
Quiet Time ADR FN=8
Rx:
Quiet Time ADR FN=8
1.5.4 P M
RESET ULTIPLE
Note: Both Modbus registers MUST be written at the same time when writing 32-bit values.
Tx:
Start
Quiet
ADR FN=16 Register
Time
MSB
Rx:
FN=16
Quiet Time ADR
(+128 if
1.5.5 E R
RROR ESPONSES
Rx:
Quiet Time ADR
Error Sub codes are:
1 = Invalid Function Code. Indicates that the use of an invalid or unimplemented function has been
attempted.
2 = Invalid Address Field. Indicates that a read or write was made to an invalid address. Can also
indicate that a read or write to a single register of a 32-bit value has been attempted.
3 = Invalid Data Field. Indicates that an attempt to write an invalid value to a register has occurred.
This error code will also be returned if an attempt is made to change a value under Weights and Measures
control without with W&M switch being in the active state.
4 = Query Processing Failure. This code is not returned.
( =8)
FN
Diagnostic Diagnostic
Code MSB Code LSB
Diagnostic Diagnostic
Code MSB Code LSB
R ( =16)
EGISTERS FN
Number
Start
Of
Register
Registers
LSB
MSB
Register
Start Start
Register Register
MSB LSB
error)
( = +128)
FN
FN+128
Data MSB Data LSB
Data MSB Data LSB
Number
of Byte
Registers Count
LSB
st
1
st
1 Next
Register Register
MSB
LSB MSB
Number
Number
Of of
Registers Registers
LSB
MSB
Error
Subcode
CRC1 CRC2
CRC1 CRC2
Next
...
Register CRC1 CRC2
MSB
CRC1 CRC2
CRC2
10
Quiet Time
Quiet Time
Quiet
Time
Quiet Time
CRC1