Serial Line Operation; Default Serial Communication Settings; Important Serial Commands; Multiple Transmitters On Rs-485 Line - Vaisala DPT145 Guide Rapide

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Serial Line Operation

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Default Serial Communication Settings

Property
Baud rate
Parity
Data bits
Stop bits
Flow control

Important Serial Commands

Command
R
S
SEND [address]
FORM [modifier string]
?
??
SMODE [mode]
MIXRATIO [0 ... 100]
ADDR [0 ... 255]
OPEN [0 ... 255]
CLOSE
RESET
HELP

Multiple Transmitters on RS-485 Line

By default, DPT145 transmitters are configured for single transmitter
operation. Serial operation mode is STOP and address is 0.
To configure transmitters for operation on a common line, you must give
each transmitter a unique address (range 0 ... 255) and set their serial
operation mode to POLL.
1. Connect the transmitter to the RS-485 line and power.
2. Change the address of the transmitter using the ADDR command:
addr [0...255]
3. Set the serial mode of the transmitter to POLL using the SMODE
command:
smode poll
4. Reset the transmitter to take the new settings into use.
Description / Value
19200
None
8
1
None
Description
Start the outputting
Stop the outputting
Output readings once (specify address for
transmitters in POLL mode)
Set output format
Device information
Device information (overrides POLL mode)
Show or set startup serial mode:
RUN, STOP, or POLL
Show or set ratio (%) of SF
Show or set transmitter address
Open a line to transmitter at defined address
Close a line to a transmitter
Reset the transmitter
List of serial commands
in the measured gas
6