Checking The Serial Port Network Operation; Stop Mode - Vaisala HMP240 SERIES User Manual

M210300en
4.

CHECKING THE SERIAL PORT NETWORK OPERATION

Measurement readings are normally asked with the transmitter in POLL mode;
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.
4.1

STOP mode

Open the line to the transmitter:
Transmitter no. 22 is now temporarily set to STOP mode; it accepts com-
mands sent without address until CLOSE command is given. Individual set-
tings can now be easily modified. Do not open more than one line at a time.
Use command ? to find out the settings of the active transmitter:
When the necessary settings have been given, close the line to transmitters
(the command closes all open lines):
CLOSE command is always given without address. If no line is open, there
will be no response to the CLOSE commands.
open 22<cr>
HMP 22 line opened for operator commands
? <cr>
HMP 240 / 1.02
CPU serial nr :
Keyboard type :
Address : 7
Output units :
Baud P D S :
Serial mode :
Output intrv. :
Mtim : 32
Pressure : 1013.25
Analog outputs
Ch1 0.00 ...
Ch2 0.00 ...
Ch1 ( RH ) lo
Ch1 ( RH ) hi
Ch2 ( T ) lo
Ch2 ( T ) hi
Transducer :
PRB serial nr :
Calibr. date :
>close
line closed
Appendix 2: RS 485/422 serial port module
0
0
metric
4800 E 7 1 FDX
STOP
0 min
10.00 V
10.00 V
0.000 %RH
100.000 %RH
-20.000 'C
180.000 'C
0
0
HMP240
99