Vaisala HMP228 User Manual
Page 102
HMP228
Appendix 5: Digital current loop module
M210282en-A
96
POLL mode
If a transmitter has been set to POLL mode, it will respond only to commands
which include its address:
send 22
aw= 0.244 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 increased to
9 by using dual loop wiring.
Current loop settings
HMP228 settings
single pair
dual pair
Full duplex/half duplex
HDX
FDX
Echo on/off
OFF
ON
Terminal settings
single pair
dual pair
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 when also the HMP228 transmitters send
line feed.