Campbell CR310 - Serial Talk through and Comms Watch; Transparent Mode

Table 22-1: CR300 series terminal commands
Command Description Use
T
Terminal master
Communicate through the terminal mode of a
remote CR300 series by way of another CR300
series. See also Terminal master(p. 184).
W
Comms Watch (Sniff)
Enables monitoring of CR300 series
communications traffic. No timeout when
connected via PakBus.
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:
l
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
characters on the RS-232 port unless the port is first opened with the SerialOpen()
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.
22. Tips and troubleshooting181