CHAPTER 4
Sensor Connections
169
Note: To find out which internal sensors your devices are
equipped with, please refer to the user manuals of the
respective devices.
Logical Channels and Output Channels
Logical channels and output channel are used at the A740 RTU.
The A740 provides programmable sensor connections which are
combined as LC and OC connections.
Logical channels are used for analog/digital sensors.
Output channels are used for analog/digital actuators.
For details see the A740 user manual.
SDI-12 Bus
The abbreviation “SDI-12” is an acronym for "Serial Data Interface
with 1.200 baud". This standard communications protocol was
developed particularly to interface battery powered recording
devices with micro-processor based sensors designed for environ-
mental monitoring. Unlike RS-232/RS-485 devices which usually
require proprietary drivers for communication, the SDI-12 protocol
ensures compatibility between all sensors and loggers featuring
such an interface. If you want to learn more about SDI-12, visit the
website of the SDI-12 Support Group , “http://www.sdi-12.org/”.
The SDI-12 bus built into the A740 addNODE or usable with an
adapter on A723 addITs and A733 addWAVEs is enjoying increas-
ing popularity with manufacturers of low power sensors, particu-
larly in the field of water quality monitoring. Many manufacturers
of multi-parameter probes, like Hydrolab, YSI and Greenspan,
already offer SDI-12 compatible probes.
Note: The A506 SDI-12 Adapter makes A723 addITs and A733
addWAVEs SDI-compatible. If you have SDI-12 sensors,
attach the SDI-12 adapter and the respective sensors. For
more details about installing the SDI-12 adapter and SDI-12
sensors, consult the corresponding users manuals.
Summary of Contents for A850
Page 92: ...CHAPTER 3 Configuring the Gateway 92 Figure 81 PPP Configuration Window ...
Page 128: ...CHAPTER 3 Configuring the Gateway 128 Figure 132 Dialup Modem Window ...
Page 164: ...CHAPTER 3 Configuring the Gateway 164 ...
Page 177: ...CHAPTER 4 Sensor Type Configuration 177 Figure 183 Sensor type Window Analog ...
Page 196: ...CHAPTER 4 Using the Gateway 196 Figure 216 Sensor type Window LC ...
Page 200: ...CHAPTER 4 Using the Gateway 200 Figure 222 Sensor type Window OC ...
Page 204: ...CHAPTER 4 Using the Gateway 204 Figure 228 Sensor type Window SDI ...
Page 215: ...CHAPTER 4 Logs 215 Figure 241 System Log Selection Log types Figure 242 System Log Log types ...
Page 275: ...CHAPTER 4 RTU Network Configuration 275 Sensor details Figure 319 Sensor details Window ...
Page 366: ...CHAPTER 6 Appendix 366 ...