Xylem Ai1 Series Quick Start Manual page 34

o SET COMMS WATCH. It is possible to watch the traffic on almost any port. Common options include
9 for SDI12 communications on port C1 and 12 for the status of the internal cellular connection. A
shortcut for SET COMMS WATCH is W.
o P. Serial talk-through and listen. Similar to SET COMMS WATCH (with option 2 for ComRS232) it is
possible to both watch traffic AND issue commands to talk to the serial instrument, however any
datalogger commands the read the traffic will fail to read serial data while talk-through is active.
Figure 25 - Serial talk through to communicate directly with serial sensors
o SDI12. Similar to serial talk-through but customised for SDI12 communications. The screenshot
below shows a sample SDI12 session to confirm that an instrument is operating correctly.
Figure 26 – SDI12 interactive session confirming correct sensor operation
Type {enter} several times
Type SDI12{enter}
Type 1{enter} for C1
Type ?!{enter}
Figure 24 - SET COMMS WATCH for debugging
A CR300> command prompt is returned
The Ai1 asks which port to use C1 or C2. C1 is normally used for
SDi12
The Ai1 enters SDI12 terminal mode
The ? asks for any sensors connected to the bus to respond. The !
must be at the end of all SDI12 commands to transmit the request.
This only works if a single sensor is connected, otherwise all sensors