Vaisala HMP260 User Manual

Page 95

HMP260 SERIES
Appendix 3: RS 485/422 serial port module

HMP260-U017en-1.5

•

Set the address of the transmitter; it can be 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.

•

Check that the jumpers in connector X4 are in the right places.

•

Remount the RS 485/422 serial module.

•

Close the cover.

•

When all transmitters on the network have been configured, switch
them off.

Dual loop operation

The following procedure must be repeated with all transmitters.