Single loop wiring, Dual loop operation – Vaisala HMP240 User Manual
Page 107
HMP240
M210300en
Appendix 3: Digital current loop module
105
Single loop wiring
•
Set the address of the transmitter; you can choose any number
between 1 and 99. In this example the address is 22:
>addr 22
Address : 22
•
Set the serial bus settings according to your network specifications.
This setting will become valid after next RESET or power off:
>seri 2400 e 7 1 h
2400 E 7 1 HDX
•
Set the transmitter in POLL mode:
>smode poll
Serial mode : POLL
NOTE 1
The SMODE command must be given last.
NOTE 2
The transmitter outputs no prompt (>) after the SMODE
POLL command and it only reacts to commands which
include its address.
•
Check that the transmitter responds to its address:
send 22
RH= 24.4 %RH T= 29.1 'C
•
Disconnect the terminal.
•
Remount the digital current loop module.
•
Close the cover.
•
When all transmitters on the network have been configured, switch
them off.
Dual loop operation
Single pair/dual pair use is configured through wiring (see figure on page 2).
The following procedure must be repeated with all transmitters.
•
Open the transmitter cover.
•
Pull out the digital current loop module, if it is already mounted.