Serial Talk Through And Comms Watch; Transparent Mode - Campbell CR300 Series Product Manual

Table 22-1: CR300 series terminal commands
Command
T
Terminal master
W
Comms Watch (Sniff)
PCAP
Wireshark PCAP file capture Campbell Scientific engineering tool

22.9.1 Serial talk through and comms watch

The P: Serial Talk Through and W: Comms Watch ("sniff") modes do not have a timeout when
connected in terminal mode via PakBus. Otherwise, the timeout can be changed from the default
of 40 seconds to any value ranging from 1 to 86400 seconds (86400 seconds = 1 day).
When using options P or W in a terminal session, consider the following:
Concurrent terminal sessions are not allowed by the CR300 series.
l
Opening a new terminal session will close the current terminal session.
l
The data logger will attempt to enter a terminal session when it receives non-PakBus
l
characters on the RS-232 port unless the port is first opened with the
instruction.
If the data logger attempts to enter a terminal session on the RS-232 port because of an
incoming non-PakBus character, and that port was not opened using SerialOpen(), any
currently running terminal function, including the comms watch, will immediately stop. So, in
programs that frequently open and close a serial port, the probability is higher that a non-PakBus
character will arrive at the closed serial port, thus closing an existing talk-through or comms
watch session.
For more information on Comms Watch, see a video
at: https://www.campbellsci.com/videos/sdi12-sensors-watch-or-sniffer-mode
22.9.2 SDI-12 transparent mode
All SDI-12 probes have just three wires—a signal, ground, and 12 V power line. They are
connected to the data logger according to the following table.
Description
Communicate through the terminal mode of a
remote CR300 series by way of another CR300
series. See also Terminal
Enables monitoring of CR300 series
communications traffic. No timeout when
connected via PakBus.
Use
master (p. 184).
SerialOpen()
.
22. Tips and troubleshooting 181