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In a PakBus network, each datalogger is assigned a unique address. The default PakBus address
in most devices is 1. To communicate with the datalogger, the datalogger support software must
know the datalogger PakBus address. The PakBus address is changed using Device Configuration
Utility, datalogger Settings Editor, or PakBus Graph software.
CRBasic PakBus instructions include:
l
GetDataRecord()
l
GetVariables()
l
SendData()
l
SendGetVariables()
l
SendVariables()
7.7 SDI-12 communications
SDI-12 is a 1200 baud communications protocol that supports many smart sensors, probes and
devices. The datalogger supports SDI-12 communications through two modes — transparent
mode and programmed mode (see
(p. 13) for wiring terminal information).
Conflicts can occur when a control port pair is used for different instructions
(
TimerInput()
,
PulseCount()
,
SDI12Recorder()
,
WaitDigTrig()
). For example,
if C1 is used for
SDI12Recorder()
, C2 cannot be used for
TimerInput()
,
PulseCount
()
, or
WaitDigTrig()
.
Transparent mode facilitates sensor setup and troubleshooting. It allows commands to be
manually issued and the full sensor response viewed. Transparent mode does not record data.
See
(p. 94) for more information.
Programmed mode automates much of the SDI-12 protocol and provides for data recording. See
SDI-12 programmed mode/recorder mode
(p. 96) for more information.
CRBasic SDI-12 instructions include:
l
SDI12Recorder()
l
SDI12SensorSetup()
l
SDI12SensorResponse()
The datalogger uses SDI-12 version 1.4.
7.7.1 SDI-12 transparent mode
System operators can manually interrogate and enter settings in probes using transparent mode.
Transparent mode is useful in troubleshooting SDI-12 systems because it allows direct
communications with probes.
7. Communications Protocols
94
Содержание CR1000X
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Страница 16: ...Appendix A Glossary 176 Appendix B Index 214 Table of Contents viii ...
Страница 20: ...l Smart sensors o SDI 12 o RS 232 o Modbus o DNP3 o TCP IP o RS 485 1 Data acquisition system components 4 ...
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Страница 237: ...wiring panel 5 Appendix B Index 220 ...