Vaisala HMP240 - Manual (Page 101)

HMP240
M210300en Appendix 2: RS 485/422 serial port module
99
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:
open 22<cr>
HMP 22 line opened for operator commands
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:
? <cr>
HMP 240 / 1.02
CPU serial nr : 0
Keyboard type : 0
Address
: 7
Output units : metric
Baud P D S : 4800 E 7 1 FDX
Serial mode : STOP
Output intrv. : 0 min
Mtim
: 32
Pressure : 1013.25
Analog outputs
Ch1 0.00 ... 10.00 V
Ch2 0.00 ... 10.00 V
Ch1 ( RH )
lo 0.000 %RH
Ch1 ( RH ) hi 100.000 %RH
Ch2 ( T ) lo -20.000 'C
Ch2 ( T ) hi 180.000 'C
Transducer :
PRB serial nr : 0
Calibr. date
: 0
When the necessary settings have been given, close the line to transmitters
(the command closes all open lines):
>close
line closed
CLOSE command is always given without address. If no line is open, there
will be no response to the CLOSE commands.