Vaisala HMP230 - Manual (Page 120)

HMP230 SERIES
Appendix 3: RS 485/422 serial port module
M210225en-A
114
4. 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 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:
open 22
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:
>?
HMP 230 / 3.01
CPU serial nr
: S4330008
Keyboard type : 1
Address : 0
Output units : metric
Baud P D S : 4800 E 7 1 FDX
Serial mode : STOP
Output intrv. : 0 s
Mtim : 32
Pressure : 1013.25
Analog outputs
Ch1 0.00 ... 20.00 mA
Ch2 0.00 ... 20.00 mA
Ch1 ( RH ) lo 0.000 %RH
Ch1 ( RH ) hi 100.000 %RH
Ch2 ( T ) lo -40.000 'C
Ch2 ( T ) hi 180.000 'C
Transducer :
PRB serial nr : 9702
PRB cal. date : 970117
When the necessary settings have been made, 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.