Vaisala HMT330 Manuel d'utilisateur Page 99

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 209
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 98
Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 97
Outputting Reading Once From All Transmitters
Use the DSEND command to output the reading once from all connected
transmitters that are in STOP or POLL modes. In order to avoid data
collisions, the transmitters will send their response after a suitable delay.
The response includes the transmitters’s address, followed by their
measurement message.
NOTE
The total execution time of the
DSEND command depends on the bit rate
of the serial
port connection. At slow speeds, it will take a considerable
amount of time for devices with large address number to
respond. The
delay will be the same even if there are no other devices at all.
DSEND<cr>
Example (transmitters with addresses 3 and 25 responding):
>dsend
3 RH= 98.4 %RH T= 31.1 'C
25 RH= 71.1 %RH T= 34.0 'C
>
Communicating with a Transmitter in POLL
Mode
OPEN
When all transmitters on the RS-485 bus are in POLL mode the OPEN
command sets one transmitter temporarily to STOP mode so that other
commands can be entered.
OPEN [aa]
where
aa
=
Address of the transmitter (0 ... 255)
CLOSE
The CLOSE command switches the transmitter back to the POLL mode.
Example:
>OPEN 2 (opens the line to transmitter 2, other
transmitters stay in POLL mode)
>CRH (for example, calibration performed)
...
>CLOSE (line closed)
Vue de la page 98
1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 208 209

Commentaires sur ces manuels

Pas de commentaire