MEATEST
Electromagnetic flowmeter M921
Operation manual
37
5.2.2.3
Input/output
5.2.2.3.1
Current output
Current output mode setting
SCM(?)<CPD> { 0 | 1 | 2 | 3 | 4 | 5 }
Following modes can be set:
0
Off
1
Positive Flow
2
Negative Flow
3
Absolute Flow
4
Bipolar Flow
5
Fixed
M921 confirms execution with string „Ok<cr>”.
Example:
Command „SCM1<cr>” sets mode “Positive flowrate” for current output. If query „SCM?<cr>” is sent,
flowmeter returns response in format „1<cr>”.
Current output constant Qi setting
SCO(?)<DNPD>
Command sets constant Qi, which represents flowrate value for current 20 mA.
<DNPD>
It represents required flowrate in actual units. M921 confirms execution with string „Ok<cr>”. In case of
query M921 returns set value in actual units.
Example:
Command „SCO10.5<cr>” sets value Qi to 10.5 in actual units. After query „SCO?<cr>” flowmeter returns
string „10.500000<cr>”.
Fixed current setting
SFC(?)<DNPD>
Command sets fixed current in range between 4 mA and 20 mA. Current output must be set to “Fixed” mode.
<DNPD>
It represents current for “Current output” in mA. M921 confirms execution with string „Ok<cr>”. In case of
query M921 returns set value in mA.
Example:
Command „SFC10<cr>” sets current output to 10 mA (it must be set to “Fixed current” mode). After query
„SFC?<cr>” flowmeter returns string „10.000000<cr>”.
Current loop test
FCE(?)<CPD> { 0 | 1 }
Internal current loop test can be switched:
0
Off
1
On
M921 confirms current loop test state with string „Ok<cr>”.
Example:
