Query - Sigma 980 Operating And Maintenance Manual

Unit
ML
AF
CF
GAL
L
M3
IN
CM
FT
M
CM2
FT2
IN2
M2
AFD
CFS
CFM
CFH
CFD
CMS
CMM
CMH
CMD
GPS
GPM

Query

Start Slave Function
':' Address
Table 37 SCADA-Modbus Units of Measure Codes
Code
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
The Modbus ASCII query must take the form shown below that specifies the
starting register and number of registers to be read:
Start Start
Address Address
(03)
High Low
For example, to read the level channel of the 980 Flow Meter, the query must
be as indicated in
The master queries the flow meter using a Read Holding Registers request,
which implies a 4XXXX register reference, to slave device address 01.
The message requests data from holding registers 40007–40008 to obtain the
level information, which requires two registers to store the floating point value.
Note that registers are referenced from zero in the data field.
Unit
GPH
LPS
LPM
LPH
MGD
PH
ORP
PPM
PPB
MGL
PCTSAT
MSIEMENS
MICROSIEMENS
GRAMSPERKG
PCTPERDEGC
DEGREE_C
DEGREE_F
MILS
VOLTS
FPS
MPS
PCT_O2
PCT_H2S
PCT_LEL
VDC
No. of Pts. No. of.
High Pts. Low
Table 38.
SCADA-Modbus® System Guidelines
Appendix E
Code
26
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28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
LRC <CR> <LF>
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