Functions - MGE UPS Systems SineWave JBUS Manuel D'installation Et D'utilisation

If the message is incorrect (unequal
CRC 16 values), the slave does not
respond.
If the message received is correct but
the slave is unable to process it
(incorrect address, incorrect data, etc.),
the slave returns an error message with
the following contents:

functions

functions 3 and 4: read n words
The number of words must be less than
or equal to the word field size
(see memory board).
function 3: read output or internal
words;
function 4: read input words.
MGE UPS SYSTEMS
response
slave
address
(1 to FF)
1 byte
example
01 06 H
01 16 H
request
slave address
1 byte
request
slave address
1 byte
example
reading words at location 90 to 99 of slave at address 28H (voltage fields)
request
28 03 0090
response
28 03 14
word 0090
SineWave™ JBUS communication system installation: E-51027160XT/AC
error codes:
1. unknown function code
2. incorrect address
3. incorrect data
4. station not ready
9. field overlap
function code
received and
MS bit = 1
1
1 byte 1 byte
00 00 00 00 DD CB request
01 86 50 response
address of
3 or 4
first bit
MSB
1 byte 2 bytes
number of
3 or 4
bytes read
1 byte 1 byte
000A A8 45
XXXX YYYY CRC 16
word 009A
errors handled
by the
communication
port
CRC 16
2 bytes
number of
CRC 16
words
LSB MSB LSB
2 bytes 2 bytes
first word last word
PF pf PF pf
2 bytes 2 bytes
CRC 16
2 bytes
11