Vaisala HMP260 - Manual (Page 27)

HMP260 SERIES
HMP260-U017en-1.5 Operating Manual
1997-11-25 21
5. COMMANDS
As the HMP260 transmitters are microprocessor based devices, their
configuration can be set to correspond to the specific needs of the user. This is
done through commands, either utilizing the menus on the local display or by
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 HMP260 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.
5.1 Commands and security lock jumper
In order to prevent any tampering with the transmitter settings, the transmitters
can not be calibrated, the analogue outputs set or the analogue output quanti-
ties selected or scaled unless the security lock jumper has been disconnected.
The commands involved are:
• all LED commands
• display/keypad commands:
Cali RH cal T cal
Analog outputs
Mode Analog outputs Mode
Scale
• serial commands:
CRH, CT, FCRH, ACAL; AMODE, ASEL, ASCL
In the following, the description of these functions is preceded with a re-
minder of the security lock jumper:
Disconnect the security lock jumper!