Vaisala HMP230 - Manual (Page 94)

HMP230 SERIES
Appendix 1: Serial commands
M210225en-B
88
SEND Outputting a reading once
SEND in STOP state
or
SEND aa in POLL state
aa = address of the transmitter when more than one transmitter is
connected to a serial bus (0...99; set with command ADDR)
Outputs the current measurement readings via the serial line. The output for-
mat depends on which parameters the transmitter can output. Output types are:
RH= 21.9 %RH T= 23.9 'C
RH= 21.9 %RH T= 23.9 'C Td=0.9 'C
RH= 21.9 %RH T=23.9 'C a=4.7 g/m3
x=4.0 g/kg Tw= 12.3 'C
RH= 21.9 %RH T= 23.9 'C Td=0.9 'C a=4.8 g/m3 x=4.0 g/kg
Tw=12.3 'C h=34.4 kJ/kg
RH= 21.9 %RH T= 24.0 'C h= 34.4 kJ/kg
The output mode can be changed with command FORM.
DSEND Outputting readings of all connected transmitters once
DSEND
All transmitters connected to the serial bus send their addresses and current
measurement readings in an order defined by their addresses. After receiving
DSEND command a transmitter sets a delay time according to its address
value and sends the data after this delay. DSEND works also in POLL mode.
With this command the user can, for example, easily find out the addresses of
the transmitters.
The output when four transmitters with addresses 4, 5, 10, 33 have been con-
nected to the serial bus:
>dsend
4 14.43 %RH
5 22.7 'C
10 14.99 %RH
33 22.3 'C
>
ERRS Outputting error messages
ERRS
During operation error messages are not output automatically through the se-
rial interface. If there is any reason to doubt that there is something wrong
with the transmitter, possible error messages can be output with command
ERRS.