Chapter 5 Commands; Commands And Security Lock Jumpers - Vaisala DMP248 Operating Manual

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C 5 ________________________________________________________________
HAPTER
COMMANDS
CHAPTER 5
The DMP248 transmitter uses a microprocessor; therefore, its
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 with the three press
switches - up, down and enter - inside the transmitter housing. Four
LEDs indicate the command given with the up and down switches.
LED commands can be used to calibrate the transmitter (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.

Commands and security lock jumpers

In order to prevent any tampering with the transmitter settings, the
transmitter cannot be calibrated, the analogue outputs set or the
analogue output quantities selected or scaled unless the security lock
jumper has been disconnected. The commands involved are:
• all LED commands (except DCAL)
• display/keypad commands:
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AISALA
Cali ð RH
Analog outputs
Mode ð Analog outputs ð Mode
COMMANDS
T
Scale