Vaisala HMP230 - Manual (Page 99)

HMP230 SERIES
M210225en-B Appendix 1: Serial commands
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The processor does not allow the following combinations:
• no parity, 7 data bits, 1 stop bit: if this combination is given the
HMP230 programme will change the number of stop bits to 2
• even or odd parity, 8 data bits, 2 stop bits: if this combination is given
the programme changes the number of stop bits to 1
NOTE
The serial bus settings become effective only after reset.
When the half-duplex mode is set, it will automatically turn the echo off. Even
then the ECHO command can indicate that echo is on.
UNIT Selecting the output units
UNIT x
x = m(etric units)
n(on-metric units)
quantity metric non-metric
RH = relative humidity %RH %RH
T = temperature °C °F
Td = dewpoint temperature °C °F
a = absolute humidity g/m 3 gr/ft 3
x = mixing ratio g/kg gr/lb
h = enthalpy kJ/kg Btu/lb
Tw = wet bulb temperature °C °F
For example, the command for setting the non-metric units is:
>UNIT N
Output units : non metric
When the command is given with no parameters, the transmitter outputs the
currently valid setting.