SM3000
Multipoint Videographic Recorder
Appendix B – Modbus Guide
146
IM/SM3000–EN Rev. L
B.4.2 Operating Mode Modbus Registers
Tables B.18 to B.39 detail the contents of the Modbus registers
accessible while the instrument is in the operating mode.
Two data types are used:
n
32-bit single precision floating point data in IEEE format
n
64-bit double precision floating point data in IEEE format
Note.
When writing to a parameter that occupies more
than one register position then all registers relating to that
parameter MUST be written to as part of a multiple register
write. If this is not achieved a NAK exception response is
issued. Individual registers can be read without causing an
exception response.
When accessing a parameter that occupies more than one
register position, the lowest numbered register contains the
most significant data.
Analog Inputs
Modbus Registers
Read only, 32-bit single precision floating point
A1
0001 and 0002
A2
0003 and 0004
A3
0005 and 0006
A4
0007 and 0008
A5
0009 and 0010
A6
0011 and 0012
B1
0013 and 0014
B2
0015 and 0016
B3
0017 and 0018
B4
0019 and 0020
B5
0021 and 0022
B6
0023 and 0024
C1
0025 and 0026
C2
0027 and 0028
C3
0029 and 0030
C4
0031 and 0032
C5
0033 and 0034
C6
0035 and 0036
D1
0037 and 0038
D2
0039 and 0040
D3
0041 and 0042
D4
0043 and 0044
D5
0045 and 0046
D6
0047 and 0048
E1
0049 and 0050
E2
0051 and 0052
E3
0053 and 0054
E4
0055 and 0056
E5
0057 and 0058
E6
0059 and 0060
F1
0061 and 0062
F2
0063 and 0064
F3
0065 and 0066
F4
0067 and 0068
F5
0069 and 0070
F6
0071 and 0072
Table B.18 Analog Inputs