Vaisala HMP60 Guía de usuario descargar pdf (Pagina 32)

User's Guide _______________________________________________________________________

30 ___________________________________________________________________ M211060EN-F

Connecting to the Serial Interface

The connection to the serial interface is via the 4-pin connector on the

probe; see connector pinout on page 22.

For temporary use of the serial interface (for example, calibration), you

can use the optional USB cable (Vaisala order code: 219690). Before you

can use the USB cable, you must install the provided USB driver on your

PC, see Installing the Driver for the USB Cable on page 30.

NOTE

The Vaisala USB cable is not designed for permanent installation.

When using the USB cable, no separate power unit is needed. The probe

is powered through the USB port.

For permanent interfacing to a host system, use a shielded cable with a

threaded connector. See list of available cables in section Options and

Accessories on page 70.

The probe does not echo typed characters back to the terminal screen. To

see the commands you type, you need to enable the

"local echo" setting in your terminal program.

A new command cannot be received while the probe is sending data out.

Wait until the instrument has completed its response before entering the

next command.

Table 7 Default Serial Communication Settings

Parameter

Value

Baud rate

19200

Parity

None

Data bits

Stop bits

Flow control

None

You can change the serial settings and operate in RUN, STOP and POLL

modes:

- After power-up the probe (in STOP mode) outputs the software

version and the command prompt.

- In RUN mode, a measurement output starts immediately after power-

up.

- In POLL mode, the probe does not output anything after power-up. It

must be accessed with an addressed command.

For a description of the modes and the SMODE command that is used to

change the mode, see section Set Serial Interface Mode on page 40.

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