Vaisala HMP240 - Manual (Page 85)

HMP240
M210300en Appendix 1: Serial commands
83
The processor does not allow the following combinations:
• no parity, 7 data bits, 1 stop bit: if this combination is given the
HMP240 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
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)
metric units non-metric
units
RH %RH %RH
T
°
C
°
F
Td
°
C
°
F
dT
°
C
°
F
a g/m 3 gr/ft 3
x g/kg gr/lb
Tw
°
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.
ADDR Setting the transmitter address
ADDR aa
aa = address (0...99)
The address is used when more than one transmitter is connected to one serial
bus. The ADDR command makes it possible to communicate with one
transmitter at a time in POLL state.
For example, transmitter is given address 99
>ADDR
Address : 2 ? 99