Vaisala HMP260 User Manual
Page 109
HMP260 SERIES
HMP260-U017en-1.5
Appendix 4: Digital current loop module
POLL mode
If a transmitter has been set to POLL mode, it will respond only to commands sent with
its address:
send 22
RH= 24.4 %RH T= 29.1 'C
Addresses from 1 to 99 can be used. According to the 20 mA current loop standard
current flows with no transmission on line. A maximum of 6 devices can be connected
on same single loop line, but the number can be raised to 9 by using dual loop wiring.
Current loop settings
HMP260 settings
single pair
dual pair
Full duplex/half duplex
HDX
FDX
Echo on/off
OFF
ON
Terminal settings
Line feed after carriage return
yes
no
HDX/FDX
FDX
FDX
When terminal is set to general <lf> (line feed) after <cr> (carriage return), the listings
will have two line feeds where also the HMP260 transmitters send line feed.