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.

• Opening a new terminal session will close the current terminal session.

• 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 .