Command
aC!
aCC!
aC1! ... aC9!
aCC1! ... aCC9!
aR0! ... aR9!
aRC0! ... aRC9!
aD0! ... aD9!
aV!
Send Identification
Example: Address = 2, Sensor = PULSC 21, device revision = 1 and serial number = 43210123
214VEGA____PSC 2100143210123
Initial Command
aI!
Start Measurement and Send Data
Command
Response
aM!
atttn<CR><LF>
a<CR><LF>
VEGAPULS C 21 • SDI-12
Response
atttn<CR><LF>
atttn<CR><LF>
atttn<CR><LF>
atttn<CR><LF>
a<values><CR><LF>
a<values><CRC><CR><LF>
a<values><CR><LF> or
a<values><CRC><CR><LF>
attn<CR><LF>
Response
aiiccccccccmmmmmmvvvxxx..xxx<CR><LF>
a: sensor address
ii:SDI-12 version number (14)
cccccccc: 8 char for vendor identification (VEGA)
vvv: 3 char for sensor version (001)
xxxxxxxx: 8 characters for. serial number (Ser-Nr)
Example
a2VEGAbbbbPSC 2100143210123<CR><LF>
Description
Start Concurrent Measurement
Start Concurrent Measurement and Request CRC
Additional Concurrent Measurements
Additional Concurrent Measurements and Request
CRC
Continuous Measurements
Continuous Measurements and Request CRC
Send Data (M*, C*, V)
Start Verification
Description
Start measurement
a: sensor address
ttt: the time in seconds, until the sensor will have the
measurement ready
n: the number of measurement values the sensor will ma-
ke and return
a<CR><LF>: service request
13 Bijlage
49