Vaisala MMT310 - Manual (Page 41)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 41
Temporarily Open Transmitter from
POLL Mode to Receive Serial Commands
Syntax: OPEN nn<cr>
Where
nn
= Address of the transmitter (0 ... 99)
The OPEN command sets the bus temporarily in STOP mode so that the
SMODE command can be issued.
Example:
>open 4
Device: 4 line opened for operator commands
>
Set Transmitter in POLL Mode
Syntax: CLOSE<cr>
In STOP mode: the command OPEN has no effect, CLOSE sets the
transmitter temporarily in POLL mode.
In POLL mode: the command OPEN sets the transmitter temporarily in
STOP mode, command CLOSE returns the instrument to POLL mode.
Example:
Relative humidity calibration is performed at transmitter 2, which is in
POLL mode.
>open 2
Opens the line to transmitter 2.
>crh
Calibration started.
...
>close
Line closed.