Checking The Serial Port Network Operation; Stop Mode - Vaisala DMP248 Operating Manual

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Checking the serial port network operation

Normally measurement readings are asked when the transmitter is in
POLL mode; then the command must include the address of the
transmitter. If the settings of the transmitter need to be changed, the
transmitter is switched to STOP mode with command OPEN;
commands can then be given without address. When the line to the
transmitter is closed, it returns to POLL mode.

STOP mode

Open the line to the transmitter:
Transmitter no. 22 is now temporarily set to STOP mode; it accepts
commands sent without address until CLOSE command is given.
Individual settings can now be easily modified. Do not open more
than one line at a time.
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>send 22
RH= 24.4 %RH T= 29.1 'C
Disconnect the terminal.
Check that the jumpers in connector X4 are in the right places.
X1
X4
Remount the RS 485/422 serial module.
Close the cover.
Repeat this setting procedure with each transmitter.
When all transmitters on the network have been configured,
switch them off.
open 22<cr>
DMP 22 line opened for operator commands
X2
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EN A