Modbus protocol description and set-up, 5 long long (64 bit integer), transmit sequence, 6 maximum number requested items – KROHNE ALTOSONIC V12 EN User Manual
Page 125: Doubles transmit order, Example, Transmit order 64 bit integer
MODBUS PROTOCOL DESCRIPTION AND SET-UP
10
125
ALTOSONIC V12
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04/2013 - 4002643502 - MA ALTOSONIC V12 R02 en
Doubles transmit order
10.6.5 Long long (64 bit integer), transmit sequence
Example
64 bit integer value 4.616.330.355.545.210.880 (= 4010 8000 0020 0000 hexadecimal).
64 bit integers could be transmitted in two ways. The transmit order in both modes:
Transmit order 64 bit integer
10.6.6 Maximum number requested items
The maximum amount of data that can be sent in a single response limits the amount of items
that can be requested in a single query.
The table below shows the maximum number of items per data type:
IEEE 754
(1)
40
h
(2)
10
h
(3)
80
h
(4)
00
h
(5)
00
h
(6)
20
h
(7)
00
h
(8)
00
h
Normal
mode
(1)
40
h
(2)
10
h
(3)
80
h
(4)
00
h
(5)
00
h
(6)
20
h
(7)
00
h
(8)
00
h
Reversed
mode
(3)
80
h
(4)
00
h
(1)
40
h
(2)
10
h
(7)
00
h
(8)
00
h
(5)
00
h
(6)
20
h
Normal
mode
(1)
40
h
(2)
10
h
(3)
80
h
(4)
00
h
(5)
00
h
(6)
20
h
(7)
00
h
(8)
00
h
Reversed
mode
(3)
80
h
(4)
00
h
(1)
40
h
(2)
10
h
(7)
00
h
(8)
00
h
(5)
00
h
(6)
20
h
Data type
Number of items
Boolean
2000
Integer (16 bit)
125
Long integer (32 bit)
62
Float (32 bit floating point)
62
Double (64 bit floating point)
31
Long long (64 bit integer)
31