3.3. Sensor Connection
With the exception of the TBS12H, the sensors connect via an M14 socket.
3.3.1. TBS12H
The TBS12H (T-Head) connects to the Otto soil moisture sensors via 5 Pin
JST connectors. For testing you should ensure that at least one sensor (on
address 0) is connected.
3.3.2. TBS12B and TBS12S
The TBS12B and TBS12S connect to the SDI-12 sensors via a 7 pin
waterproof M14 connector. The socket, which is on the bottom of the
enclosure, is wired as follows:
This image is taken looking at the socket on the TBS12 body face on. If you
plug the 7 pin plug into the socket and stand the unit on its head so the
connector is on top, the orientation will be the same when you look down
on the back of the plug from above (after taking off the backshell)
You can test connectivity to and functionality of, the sensors using the
Direct Command mode (Refer section 5.8.2 ).
3.3.3. TBS12PC-FS
The TBS12 PC-FS is used with switches which provide a closed contact
when they are active. These may be reed switches fitted to a rain gauge or
flow meter, or switches fitted to an alarm contact or float switch. In all
cases, the switch must make two contacts available: a Common (which is
wired to the ground terminal on the inputs) and the Switch input. When the
