Vaisala HMP230 User Manual download pdf (Page 40)

HMP230 SERIES

User's Guide M210225en-B

6. COMMANDS

The HMP230 transmitters use microprocessors; therefore their configuration

can be set according to the user's needs. This is done through commands,

either utilizing the menus on the local display or giving commands through the

serial interface (see Appendix 1). Most often the commands are used to

change the settings of the two analogue channels.

A limited range of commands can be given by using the three press switches -

up, down and enter - inside the transmitter housing. Four LEDs indicate the

command given with the up and down switches. The switches and LEDs are in

all HMP230 transmitters. LED commands can be used to calibrate the trans-

mitters (both humidity and temperature) or to calibrate the analogue outputs.

A full range of commands can be given through the display/keypad or through

the RS 232C serial bus. The commands can be used e.g. to select and scale the

outputs, to calibrate the humidity and temperature channels as well as the

analogue outputs and to set the serial interface.

6.1. Commands and security lock jumper

In order to prevent any tampering with the transmitter settings, the transmitters

cannot be calibrated, the analogue outputs set or the analogue output

quantities selected or scaled unless the security lock jumper has been discon-

nected. The commands involved are:

• all LED commands

• display/keypad commands:

Cali ð RH cal T cal

Analog outputs

Mode ð Analog outputs ð Mode

Scale

More ð More ð Frost

More ð Filt

• serial commands:

CRH, CT, CTA, FCRH, ACAL; AMODE, ASEL, ASCL, FROST,

FILT

In the following, the description of these functions is preceded with a re-

minder of the security lock jumper:

Disconnect the security lock jumper!

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Vaisala HMP230 User Manual Page 40