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_________________________________________________________________________CONTENTS
PTU200 Series
Transmitters
USER'S GUIDE
M210195EN-A
AUGUST 2001
VAISALA ___________________________________________________________________________I
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USER'S GUIDE_______________________________________________________________________
Table of contents
CHAPTER 1 GENERAL INFORMATION ............................................................ 1
Safety.............................................................................................. 1
Warranty......................................................................................... 2
CHAPTER 2 PRODUCT DESCRIPTION............................................................. 3
Pressure measurement ................................................................ 3
Humidity and temperature measurement ................................... 4
CHAPTER 3 GETTING STARTED ...................................................................... 5
Mounting ........................................................................................ 5
Electrical connections .................................................................. 5
Connecting the probe ................................................................... 7
CHAPTER 4 COMMISSIONING .......................................................................... 9
Display and keypad....................................................................... 9
Operating modes......................................................................... 11
SMODE Selecting the sending mode ...................................... 11
Software settings ........................................................................ 12
SERI Serial bus settings .......................................................... 12
ECHO Setting the serial bus echo on/off ................................. 12
FORM Defining the output format ............................................ 13
EFORM Defining the error output format................................. 14
DFORM Defining the display format ........................................ 15
PROMPT Setting the prompt outputting ON or OFF ............... 16
UNIT Setting the pressure and temperature units ................... 16
AVRG Setting the averaging time ............................................ 17
INTV Setting the output interval ............................................... 18
ADDR Setting the transmitter address (for POLL mode)......... 18
SCOM User specific SEND command..................................... 19
PSTAB Setting the pressure stability indicator ........................ 20
PDMAX Setting the pressure difference limit........................... 20
KEYLOCK Setting the keyboard lock on/off ............................ 21
Hardware settings ....................................................................... 21
CHAPTER 5 OPERATING ................................................................................. 25
RUN and STOP modes................................................................ 25
R Starting the continuous output.............................................. 26
S Stopping the output .............................................................. 26
SEND Outputting a single message only................................. 27
RESET Resetting the transmitter............................................. 27
POLL mode .................................................................................. 27
SEND Outputting one single message .................................... 28
OPEN Setting a transmitter from POLL mode to STOP mode 29
CLOSE Setting a transmitter from STOP mode to POLL mode29
SEND mode.................................................................................. 30
CHAPTER 6 CALIBRATION AND ADJUSTMENT........................................... 31
Pressure ....................................................................................... 31
CORR Listing linear and multipoint pressure corrections ........ 32
LC Linear pressure corrections ................................................ 33
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_________________________________________________________________________CONTENTS
LCI Entering linear pressure corrections ..................................34
MPC Multipoint pressure corrections........................................35
MPCI Entering multipoint pressure corrections ........................36
CALD Storing the date of calibration ........................................37
Humidity........................................................................................38
Humidity adjustment ................................................................. 38
Temperature .................................................................................39
Offset ........................................................................................39
Gain ..........................................................................................40
TXCI Entering corrections for HMP45D and PT100 temperature
measurement............................................................................40
V0XCI Entering corrections for HMP45A-P temperature
measurement............................................................................41
CHAPTER 7 SELF-TESTING AND PROBLEM HANDLING.............................43
Returning the serial communication parameters.....................43
Diagnostic commands ................................................................44
? Basic information on the transmitter settings .......................44
VERS Software version ............................................................ 45
SNUM Serial number ................................................................45
ERRS Error message output ................................................... 45
CHAPTER 8 TECHNICAL DATA .......................................................................47
Barometric pressure....................................................................47
Operating range........................................................................47
Accuracy class..........................................................................47
Humidity........................................................................................48
Temperature .................................................................................48
HMP45A-P & HMP45D.............................................................48
Pt100 sensor head.................................................................... 48
General..........................................................................................49
Mechanics.....................................................................................50
Transmitter body.......................................................................50
HMP45A-P and HMP45D .........................................................50
PT100 sensor head ..................................................................50
Weight.......................................................................................50
Dimensions ...............................................................................51
Transmitter body..................................................................51
HMP45A-P & HMP45D........................................................ 51
Pt100 sensor head ..............................................................52
Electromagnetic compatibility.................................................... 52
Accessories..................................................................................52
APPENDIX A OPTIONAL RS485/422 INTERFACE OF PTU200
TRANSMITTERS...........................................................................53
APPENDIX B ASHTECH PORT A/B 16 PIN CONNECTOR...............................56
APPENDIX C NMEA DATA FORMAT ................................................................. 58
GPS Commands...........................................................................59
Serial number ...........................................................................60
VAISALA __________________________________________________________________________III
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CHAPTER 1_______________________________________________________ GENERAL INFORMATION
CHAPTER 1 GENERAL INFORMATION
Safety
Throughout the manual important instructions regarding the safety
considerations are focused as follows.
WARNING
CAUTION
NOTE
Warning denotes a hazard. It calls attention to a procedure, practice,
condition or the like, which, if not correctly performed or adhered to,
could result in injury to or death of personnel.
Caution denotes a hazard. It calls attention to a procedure, practice,
condition or the like, which, if not correctly performed or adhered to,
could result in damage to or destruction of part or all of the product.
Note highlights important information. It calls attention to an essential
procedure, practice, condition or the like.
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USER'S GUIDE_______________________________________________________________________
Warranty
Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold
hereunder to be free from defects in workmanship or material during a period of twelve (12)
months from the date of delivery save for products for which a special warranty is given. If any
Product proves however to be defective in workmanship or material within the period herein
provided Vaisala undertakes to the exclusion of any other remedy to repair or at its own option
replace the defective Product or part thereof free of charge and otherwise on the same
conditions as for the original Product or part without extension to original warranty time.
Defective parts replaced in accordance with this clause shall be placed at the disposal of
Vaisala.
Vaisala also warrants the quality of all repair and service works performed by its employees to
products sold by it. In case the repair or service works should appear inadequate or faulty and
should this cause malfunction or nonfunction of the product to which the service was
performed Vaisala shall at its free option either repair or have repaired or replace the product in
question. The working hours used by employees of Vaisala for such repair or replacement
shall be free of charge to the client. This service warranty shall be valid for a period of six (6)
months from the date the service measures were completed.
This warranty is however subject to following conditions:
a) A substantiated written claim as to any alleged defects shall have been received by
Vaisala within thirty (30) days after the defect or fault became known or occurred, and
b) the allegedly defective Product or part shall, should Vaisala so require, be sent to the
works of Vaisala or to such other place as Vaisala may indicate in writing, freight and
insurance prepaid and properly packed and labelled, unless Vaisala agrees to inspect and repair
the Product or replace it on site.
This warranty does not however apply when the defect has been caused through
a) normal wear and tear or accident;
b) misuse or other unsuitable or unauthorized use of the Product or negligence or error in
storing, maintaining or in handling the Product or any equipment thereof;
c) wrong installation or assembly or failure to service the Product or otherwise follow
Vaisala's service instructions including any repairs or installation or assembly or service made
by unauthorized personnel not approved by Vaisala or replacements with parts not
manufactured or supplied by Vaisala;
d) modifications or changes of the Product as well as any adding to it without Vaisala's
prior authorization;
e) other factors depending on the Customer or a third party.
Notwithstanding the aforesaid Vaisala's liability under this clause shall not apply to any defects
arising out of materials, designs or instructions provided by the Customer.
This warranty is expressly in lieu of and excludes all other conditions, warranties and
liabilities, express or implied, whether under law, statute or otherwise, including without
limitation ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS
FOR A PARTICULAR PURPOSE and all other obligations and liabilities of Vaisala or its
representatives with respect to any defect or deficiency applicable to or resulting directly or
indirectly from the Products supplied hereunder, which obligations and liabilities are hereby
expressly cancelled and waived. Vaisala's liability shall under no circumstances exceed the
invoice price of any Product for which a warranty claim is made, nor shall Vaisala in any
circumstances be liable for lost profits or other consequential loss whether direct or indirect or
for special damages.
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CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION
CHAPTER 2 PRODUCT DESCRIPTION
The PTU200 transmitter combines three measurement parameters:
pressure, temperature and humidity. The applications of the PTU200
range from calibration laboratory environmental condition monitoring
to laser interferometer active wavelength compensation and GPS
meteorological measurements.
The PTU200 transmitters are available with one or two pressure
transducers. Three different kinds of sensor heads can be used with
PTU200: HMP45A-P, HMP45D and Pt100.
The PTU200 transmitters use a RS232 or RS485 (optional) serial
interface and they are available also with a local display.
In outdoor applications, it is recommended to use the PTU200MIK
mounting kit with the PTU200 transmitters. In addition, a mounting
tripod is available to support the PTU200MIK in temporary field
installations.
Pressure measurement
The PTU200 series transmitters use a BAROCAP® silicon capacitive
absolute sensor developed by Vaisala for barometric pressure
measurement applications. The measurement principle of the PTU200
series digital transmitters is based on an advanced RC oscillator and
three reference capacitors against which the capacitive pressure sensor
and the capacitive temperature compensation sensor are continuously
measured. The microprocessor of the transmitter performs
compensation for pressure linearity and temperature dependence.
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Humidity and temperature measurement
The HMP45A-P and HMP45D probes are designed for the
measurement of relative humidity and temperature. The humidity
measurement is based on a capacitive thin film polymer sensor,
HUMICAP180. The temperature measurement is based on resistive
platinum sensors. Both the humidity and the temperature sensors are
located at the tip of the probe and protected by a membrane filter.
The HMP45A-P probe has the HUMICAP180 polymer sensor and
the Pt 1000 resistive platinum sensor for RH and T measurements,
respectively. The 20 metres cable of the HMP45A-P is connected to a
board with a plug and thus the user can cut the cable to suitable length
and reconnect it easily. The HMP45A-P and the HMP45D have a
similar humidity output, but the temperature output is active in the
HMP45A-P (voltage output 0-1V) and passive in the HMP45D
(resistive output Pt 100). The HMP45D comes with a 3.5-meter
connection cable. The cable is soldered directly to the board inside the
transmitter.
When the humidity measurement is not required, the PTU200 can be
supplied with a small, high stability wire-type Pt100 temperature
sensor head.
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CHAPTER 3___________________________________________________________ GETTING STARTED
CHAPTER 3 GETTING STARTED
Mounting
Choose a place, which represents the environment to be measured, and
is as clean as possible. Air should circulate freely around the probe; it
ensures that the sensor head and the ambient air are at the same
temperature.
NOTE
NOTE
For outdoor installation of the PTU200 transmitter, it is
recommended to use a PTU200MIK mounting kit. For further
information, please contact Vaisala or Vaisala distributor.
Please take into a consideration that the pressure fitting supplied with
the transmitter is not a static pressure head and that the transmitter
cannot be used successfully as such in turbulent or high speed static
wind conditions.
The barometric pressure measurement accuracy quoted for the
PTU200 series digital transmitters does not include any wind or air
conditioning system measurement errors.
Electrical connections
PTU200 series transmitters have as a standard a RS 232C and as an
option a RS485/422 serial interface. Connect the RS 232C serial
interface and a power supply according to the following pin
assignment.
5
1234
9
8
67
FIGURE 3-1 9-pin female sub D-connector
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T
ABLE 3-1 Pin assignment for RS 232C/TTL serial output
PIN SIGNAL
1 TX with diode
2 TX/TXD/TXD inverted
3 RX/RXD/RXD inverted
4 external power on/off control
5 ground for the RS 232C
6
7 ground for supply voltage
8
9 supply voltage (10...30 VDC)
TABL E 3-2 Pin assignment for optional RS 232C/485/422
PIN SIGNAL
1 TX with diode
2 TX/TXD/TXD inverted
3 RX/RXD/RXD inverted
4 external power on/off control
5 ground for the RS 232C
6 RS 485/422 LO
7 ground for supply voltage and TTL level serial interface
8 RS 485/422 HI
9 supply voltage (10...30 VDC)
The factory settings of the PTU200 series transmitters are the
following:
TABL E 3-3 Serial interface factory settings
Baud rate 9600
Parity even
Data bits 7
Stop bits 1
Duplex full duplex
After having made the electrical connections, switch the power on,
and the transmitter responds indicating its type and the software
version.
PTU200 / 1.01
>
The transmitter is now ready to respond to any command available.
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CHAPTER 3___________________________________________________________ GETTING STARTED
1
At power-up, the display will first show the transmitter type and the
software version. Then it switches to display the reading as defined
with the DFORM command (page 9).
Set the desired sending form according to software settings (described
starting from page 12) and select the sending mode for the transmitter
(see page 11).
Should there be any problems please check the jumper settings in
connector X15 and the settings in dip switch S1 inside the transmitter.
The settings should be as indicated in the figure below.
RX/RXD
RXD
TX
ON
S
TXD
TXD
X15
FIGURE 3-2 Basic RS 232C jumper and dip switch S1 settings
Connecting the probe
As the cable of HMP45A-P is connected via screw terminals the user
can shorten the cable to desired length and reconnect it easily. The
cable wires are connected as shown in FIGURE 3-3.
NOTE
It is not recommend to unsold and then re-sold the wires of HMP45D
and PT100 sensor head.
OFF
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
FIGURE 3-3 Wire colours of HMP45A-P.
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FIGURE 3-4 Connecting the cable. Dimensions in mm (inches).
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CHAPTER 4_____________________________________________________________COMMISSIONING
CHAPTER 4 COMMISSIONING
Display and keypad
The optional LCD display has an on/off selectable backlight for better
readability at any light conditions. The two rows of the display can be
defined to indicate different kind of information. The keypad of the
display cover can be used to inspect and change the parameters
available.
The format of the display is defined by using the serial command
DFORM (see page 15). There are two rows containing 16 characters
each; the user can define a maximum of 32 characters to be displayed,
16 characters on each row. The following fields in the display format
can be used:
pressure quantities (pressure, average, difference)
three-hour pressure trend and pressure tendency code
temperature quantity and relative humidity
units
error status and stability indicator
number and text fields
The following basic rules apply to the use of the keypad:
1. Use ENT key to acknowledge a new selection.
2. Use CL key to activate a parameter or unit to be changed or to
revert to the original display.
3. Use arrow keys to make a selection between functional
alternatives.
Only the display contrast can be adjusted if the KEYLOCK is ON.
The transmitter displays NO MODIFICATIONS ALLOWED message
for a few seconds before reverting to the original display. It is also
possible to inspect the settings of the transmitter although the
KEYLOCK has been turned ON.
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Example of changing units:
1. Press ENT and the text UNIT starts blinking. Acknowledge it with
the ENT key (enter).
2. Press CL and the pressure unit in use starts blinking. Use arrow
keys to choose a desired unit and acknowledge it with enter.
3. The temperature unit in use starts blinking. Use arrow keys to
choose a desired unit and acknowledge it with enter. The
transmitter now returns to the original display.
Example of changing serial settings:
1. Press ENT and the text UNIT starts blinking. Choose SER by using
the arrow keys and acknowledge with enter.
2. Press CL and BAUD starts blinking. After pressing ENT, all the
available baud rates will be displayed. Use arrow keys to choose a
desired value and acknowledge it with enter. PARI starts blinking.
Press CL to exit or continue to change other serial parameters in
same way as the baud rate.
NOTE
Note that modifications made using the keyboard will affect the serial
interface settings, too.
FIGURE 4-1 Available functions and selections of the local display
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CHAPTER 4_____________________________________________________________COMMISSIONING
Operating modes
Select the desired sending mode for the transmitter. This is done with
a command SMODE.
SMODE Selecting the sending mode
SMODE x <cr>
where:
x = STOP, RUN, SEND or POLL
The SMODE command is used to set or inspect the sending mode of
the transmitter. The PTU200 series transmitters have four sending
modes: STOP, RUN, SEND and POLL.
In STOP mode, after power-up the transmitter outputs its type and
software version and then waits for further commands.
In RUN mode, continuous outputting starts automatically from powerup.
In SEND mode, a single message is automatically output after powerup.
POLL mode allows the communication with multiple transmitters or
other digital instruments connected to one serial bus. The transmitter
does not echo in POLL mode.
Examples:
>smode <cr>
Serial mode : STOP
>smode run <cr>
Serial mode : RUN
>smode send <cr>
Serial mode : SEND
>smode poll <cr>
Serial mode : POLL
>smode stop <cr>
Serial mode : STOP
>reset<cr>
NOTE
Remember to give the RESET command to initialize the new sending
mode.
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Software settings
SERI Serial bus settings
SERI b p d s x <cr>
where: (* = factory setting)
b = baud rate (300...9600*...38400)
p = parity (E = even*, O = odd, N =
none)
d = data bits (7* or 8)
s = stop bits (1* or 2)
x = duplex (F = full* or H = half)
<cr> = carriage return is generated by the
ENTER or RETURN key of the
host computer
The SERI command is used to set or inspect the serial bus settings of
the transmitter.
Examples:
>seri <cr>
9600 E71F
>seri 1200N81H<cr>
1200 N81H
>reset <cr>
PTU200 / 1.01
>
NOTE
Always give the RESET command after the SERI command to
activate the new serial bus settings.
ECHO Setting the serial bus echo on/off
ECHO x <cr>
where:
x=ONorOFF
The ECHO command can be used to set or inspect the echoing
condition of the transmitter. In OFF mode the transmitter does neither
output the '>' prompt character nor echo the given commands.
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CHAPTER 4_____________________________________________________________COMMISSIONING
Examples:
>echo <cr>
Echo : ON
>
>echo off <cr>
Echo : OFF
FORM Defining the output format
FORM <cr>
The FORM command can be used to set or inspect the output format
of the transmitter. The maximum length of FORM is 80 characters.
The user can define the following fields into the output format:
amount of decimals give number of decimals before a
quantity. Giving 4.2 before the
pressure quantity outputs a reading
with the following form: 1013.12
pressure quantities P1, P2, P (average), PD
(difference)
pressure trend *) TRE (three-hour trend)
pressure tendency A (three-hour tendency)
temperature quantity of PT100
and HMP45D sensor heads *) T
temperature quantity
of HMP45A-P *) TH
relative humidity RH
units U, UU, UUU, UUUU, UUUUU
serial number of the transmitter SN
error status ERR (three characters)
stability indicator OK (uses three characters)
checksums CS2, CS4
CSX
number fields n.m where: n = 0 - 9, m = 0 - 9
text fields within “ “ characters
CR \ r or #r
LF \ n or #n
TAB \ t or #t
nnn ASCII code \ nnn or # nnn (cannot be 000)
*) The PTU200 transmitter cannot output + sign for pressure trend or
temperature reading; a space is output instead.
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Example of setting the output format:
>form
P1""UUU""T""UU""RH""UUU\r\n
?4.1P""UUU"""Tend"""1.0A""3.1TUU""
3.0 RH UUU \r \n
>send
1007.9 hPa Tend 7 24.9'C 28%RH
>
Inspecting the output format:
>form
P1""UUU""T""UU""RH""UUU\r\n
?<esc>
Use ESC-key to abort without changing the settings.
EFORM Defining the error output format
EFORM <cr>
The EFORM command can be used to define a user specific error
output format for the serial line. In case of an error, the transmitter
outputs the defined format instead of *****.
Example of an EFORM definition:
>eform <cr>
? "ERROR" \r \n <cr>
>send
1007.8 hPa OK (correct operation)
>send <cr>
ERROR (incorrect operation)
>
Any previous EFORM definition may be removed with the following
command:
>eform * <cr>
>
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DFORM Defining the display format
DFORM <cr>
The DFORM command is used to define the format for the optional
LCD display. There are two rows containing 16 characters each. The
user can define the following fields into the display format:
pressure quantities P1, P2, P (average), PD
(difference)
pressure trend *) TRE (three-hour trend)
pressure tendency A (three-hour tendency)
temperature quantity of PT100
and HMP45D sensor heads *) T
temperature quantity
of HMP45 TH
relative humidity RH
units U, UU, UUU, UUUU, UUUUU
serial number of the transmitter SN
error status ERR (three characters)
stability indicator OK (uses three characters)
number fields n.m where: n = 0 - 9, m = 0- 9
text fields within “ “ characters
*) The PTU200 transmitter cannot output + sign for pressure trend or
temperature reading; a space is output instead.
Any previous DFORM definition may be removed and the original
factory setting restored with the following command:
>dform * <cr>
>
Example of setting the display format to show pressure, stability
indicator, pressure trend and pressure tendency:
>dform <cr>
4.2P""UUUUU OK \r \n
?""4.2P""UUUOK"trend " 2.1 TRE""UUU""A
<cr>
>
The display will look similar to the following:
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The PTU200 transmitter will show * instead of numeric values for
pressure trend and pressure tendency for three hours from power-up.
In case of error, the relevant error message will automatically appear
on the display. In this case, any other information defined using the
DFORM command will be replaced with an error message.
PROMPT Setting the prompt outputting ON or OFF
PROMPT x
where:
x = ON or OFF
>PROMPT<cr>
Prompt : ON
>PROMPT OFF<cr>
Prompt : OFF
send<cr>
1007.9 hPa Tend 7 24.9 'C 28 %RH
PROMPT ON<cr>
Prompt : ON
>
UNIT Setting the pressure and temperature units
UNIT x <cr>
where (* = factory setting)
x = hPa*, kPa, Pa, bar, mbar, inHg, mmHg, torr, mmH2O, psia, C*, F
This command is used to set and inspect the pressure and temperature
unit.
Example of changing the pressure and temperature units:
>unit <cr>
P unit : hPa
T unit : 'C
>unit C <cr>
>send
1018.33 hPa 24.19 'C 32.96 %RH
>unit torr <cr>
P unit : torr
T unit : 'C
>unit F <cr>
>send
763.84 torr 75.62 'F 32.89 %RH
>
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AVRG Setting the averaging time
AVRG x <cr>
where:
x = 1 ... 600 (seconds)
The AVRG command is used to set and inspect the averaging time
during which the individual measurement samples are integrated to
get an averaged reading. The averaging time is the total averaging
time of the transmitter.
In case of two internal pressure transducers, the defined averaging
time is divided by three to get an averaging time for each pressure
transducer. The third transducer is the VMT for measuring RH/T.
Note that if the averaging time is defined to be long, the settling time
at power-up will be long, too.
The output reading is a running average pressure reading. The
measurement is updated in normal measurement mode approximately
every 1 to 4 seconds, depending on the AVRG setting.
A minimum of one-second averaging time is recommended per each
pressure transducer. These selections are used as the factory setting
averaging times.
Example of setting the averaging time to 60 seconds (WMO averaging
time for barometric pressure measurement):
>avrg <cr>
Averaging time: 1.0 ?<cr>
>
>avrg 60 <cr>
Averaging time: 60.0
>
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INTV Setting the output interval
INTV x y <cr>
where:
x = output interval (0...255)
y = unit (s, min, h)
This command is used to set and inspect the output interval. The R
command is used to start the outputting.
Examples:
>intv <cr>
Output intrv. : 0 s
>
>intv 10 s <cr>
Output intrv. : 10 s
>r <cr>
NOTE
In case of the half duplex RS 485/422 serial communication, the user
is requested to set the interval time to one second or more. This
enables an interruption of outputting, if the R command is given by
mistake.
ADDR Setting the transmitter address (for POLL mode)
ADDR x <cr>
where:
x = the address (0 ... 99)
This command is used to set and inspect the address of the transmitter
for the POLL mode. The address feature is important when multiple
transmitters are connected to one RS232C interface or when a
transmitter is used on an RS485/422 serial interface.
Example of setting the address to 7:
>addr 7 <cr>
Address : 7
>
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A new address replaces the previous one. Always set the address to 0
when no address is needed:
>addr 0 <cr>
Address : 0
>
NOTE
If the transmitter is not closed in the POLL mode, it will respond to
any SEND command despite of the address. The transmitter has to be
set to POLL mode and then closed with CLOSE command (see
Chapter POLL mode).
SCOM User specific SEND command
SCOM <cr>
This command is used to define a user specific SEND command for
one message output. The standard SEND command of the transmitter
will always function normally whatever the SCOM definition may be.
The new command must be defined within “ “ signs, then some end
characters also can be defined.
Note that the SCOM command is case sensitive. It is in fact
recommended to use the opposite case characters for SCOM definition
to avoid incocsistency with other commands. Note also that the
PTU200 does not react on <eot> at the end of a command.
Example of setting a P (note the upper case character in comparison to
the rest of the lower case characters) command for one message
output:
>scom <cr>
? "P" \ r <cr>
>P <cr>
1020.30 hPa
>
Example of defining a similar command without an end character:
>scom <cr>
"P" \r
? "P" <cr>
>P1020.30 hPa
>
Any previous SCOM definition may be removed with the following
command:
>scom * <cr>
>
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PSTAB Setting the pressure stability indicator
PSTAB x <cr>
where:
x = pressure reading (in current unit)
The PSTAB command is used to define the pressure stability indicator
reflecting maximum allowed pressure difference between two
successive averaged measurements. The user has to also define the
FORM command to include the "OK" stability indicator field. The
factory setting for the stability indicator level is 0.5 hPa.
>pstab 0.5 <cr>
Stab. level : 0.50 hPa
>form
?4.2P""UUU""OK\r\n
>send <cr>
1020.30 hPa OK (accepted)
>send <cr>
1020.30 hPa (rejected)
>
PDMAX Setting the pressure difference limit
PDMAX x <cr>
where:
x = pressure reading
This command is used to define the maximum pressure difference
between the pressure readings from two pressure transducers (P1 and
P2). If the defined value is exceeded, the relevant digits in the ERR
field will change from 0 to 1. More than one ´1´ in the ERR field
indicates that the pressure reading output is not reliable.
For an acceptable measurement crucial conditions are:
- two transducers: P high - P low ≤ Pdmax
The factory setting for Pdmax is 1 hPa.
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CHAPTER 4_____________________________________________________________COMMISSIONING
Example of setting the limit to 0.5 hPa:
>pdmax <cr>
Pd max : 1.000 ? 0.5 <cr>
>
Example of exceeding the Pdmax limit:
>form <cr>
4.2P""UUUU \r \n
?4.2P1""P2""P""UUU""ERR\r\n<cr>
>send <cr>
1020.30 1020.32 1020.31 hPa 00
>send <cr>
1020.30 1022.30 1021.30 hPa 11
>
Please use the ERRS command to analyze problems.
KEYLOCK Setting the keyboard lock on/off
KEYLOCK x <cr>
where:
x = ON or OFF
The KEYLOCK command is used to set or inspect the keypad lock
condition of the display cover keypad. The PTU200 transmitters with
display cover are supplied with the keypad locked (KEYLOCK OFF).
It is thus possible to inspect the settings but not to change them. With
the keypad locked the settings can be inspected but not changed.
Example:
>keylock on <cr>
Keylock : ON
>
If anyone tries to change the settings using the keypad with the
KEYLOCK ON, the transmitter will display NO MODIFICATIONS
ALLOWED
for a few seconds and then returns to the original display.
Hardware settings
Inside the transmitter, there is a connector X15 (see FIGURE 4-2) and a
dip switch S1 (see
hardware settings of the PTU200.
VAISALA _________________________________________________________________________ 21
FIGURE 4-3). These are used to make the main
Page 26
USER'S GUIDE_______________________________________________________________________
1
1
With the connector X15 the user can select the RS 232C (RX, TX) or
TTL levels for serial communication. With TTL levels, the user also
has phase alternatives available for both input (RXD, RXD inverted)
and output (TXD, TXD inverted).
RX/RXD
RXD
TX
TXD
TXD
X15
FIGURE 4-2 RS 232C/TTL level and phase selections
The half duplex two-wire RS485/422 serial interface of the PTU200
does not require any hardware settings to be made to the transmitter.
See page 53 for quick reference information on how to use the
RS485/422 interface of the PTU200 series digital transmitters.
Normally, the dip switch S1 settings are all OFF as in
ON
S
FIGURE 4-3
OFF
SW3
SW5
SW1
FIGURE 4-3 Basic dip switch S1 settings
SW2
SW4
SW6
SW7
SW8
An external power control can be used to switch the PTU200
transmitter ON/OFF. The control is activated with the switch SW2 in
position
ON as shown in FIGURE 4-4. The TTL signals are: 0VDC OFF
and 5VDC ON.
ON
S
OFF
SW3
SW5
SW1
SW2
SW4
SW6
SW7
SW8
FIGURE 4-4 External power control ON
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CHAPTER 4_____________________________________________________________COMMISSIONING
T
ABLE 4-1 Summarized settings of the dip switch S1.
SW1 OFF not used
SW2 OFFONexternal power control OFF (TTL: 0 VDC)
external power control ON (TTL: 5 VDC
SW3 OFF not used
SW4 OFFONmemory write DISABLE
memory write ENABLE
SW5 OFF not used
SW6 OFF not used
SW7 OFF not used
SW8 OFFONfactory settings OFF / user settings ON
factory settings ON (9600, E, 7, 1, F)
VAISALA _________________________________________________________________________ 23
Page 28
Page 29
CHAPTER 5________________________________________________________________ OPERATING
CHAPTER 5 OPERATING
Only a few commands are needed to operate a PTU200 transmitter in
the RUN, STOP and POLL modes. In the SEND mode, no commands
are needed.
In the RUN or STOP modes, the commands R, S and SEND can be
used. The user may also use his own SEND command if he has
previously specified one using the SCOM command.
In the POLL mode, the transmitter responds to a SEND command
only if it includes the address. OPEN and CLOSE commands are also
available for temporary communication with one single transmitter.
In the SEND mode, no commands are needed. The transmitter will
automatically output one message at power-up, or when triggering the
transmitter on using pin 4.
RUN and STOP modes
TABL E 5-1 summarizes the commands that are used in the RUN and
STOP modes. In addition, the user may use his own SEND command
if he has previously specified one with the SCOM commissioning
command. The commands are not case sensitive except for the SCOM
command.
TABL E 5-1 Commands used in RUN and STOP modes
Function Command
starting output R
stopping output S
single message output SEND
resetting the transmitter RESET
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USER'S GUIDE_______________________________________________________________________
R Starting the continuous output
R <cr>
This command is used to start continuous outputting in the STOP and
RUN modes and after setting the output interval (see page and 18).
Example (in STOP mode):
>reset <cr>
PTU200 / 1.01
>r <cr>
1013.25 hPa 22.9 %RH 22.4 'C
1013.25 hPa 22.9 %RH 22.4 'C
1013.25 hPa 22.) %RH 22.4 'C
...
Example of restarting the outputting (in RUN mode):
>SMODE<cr>
Serial mode : RUN
>RESET<cr>
1009.1 hPa 42.4 %RH 24.2 'C
1009.1 hPa 42.4 %RH 24.2 'C
...
S<cr> (text invisible)
>R<cr>
1009.2 hPa 42.5 %RH 24.2 'C
1009.1 hPa 42.5 %RH 24.2 'C
...
S Stopping the output
This command is used to stop the continuous outputting (activated
with power-up or reset in RUN mode or using the R command).
Example:
>r <cr>
1013.25 hPa 22.9 %RH 22.4 'C
1013.25 hPa 22.9 %RH 22.4 'C
1013.25 hPa 22.9 %RH 22.4 'C
s <cr> (text invisible)
>
S <cr>
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CHAPTER 5________________________________________________________________ OPERATING
SEND Outputting a single message only
SEND <cr>
This command is used to output one message at a time in the STOP
and RUN modes.
>reset <cr>
PTU200 / 1.01
>send <cr>
1013.25 hPa 22.9 %RH 22.4 'C
>
The user may also use his own one-message command if he has
previously specified one using the SCOM command (see Chapter on
page 11).
RESET Resetting the transmitter
RESET <cr>
The RESET command is used to reset the transmitter. All software
settings remain in the memory after reset or any power failure. The
RESET command must always be given if the serial bus settings, DIP
switch settings or the operating mode of the transmitter have been
changed.
Example:
>reset <cr>
PTU200 / 1.01
>
POLL mode
TABL E 5-2 Commands used in RUN and STOP modes
Function Command
single message output SEND
opening a transmitter OPEN
closing a transmitter CLOSE
VAISALA _________________________________________________________________________ 27
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USER'S GUIDE_______________________________________________________________________
The POLL mode is used when several PTU200 series transmitters are
connected to one RS232C serial interface. It is also used when several
intelligent transmitters are connected to a half duplex RS 485/422
serial interface.
In the POLL mode, the transmitter must have a specific address so
that the host system is able to direct the outputting commands to the
particular transmitter. The addressable SEND command is used to ask
for a single message output from the transmitter.
The OPEN command can be used to open a single transmitter
temporarily to STOP mode. The CLOSE command will restore the
POLL mode.
SEND Outputting one single message
SEND a <cr>
where:
a = the address of the transmitter (0...99)
This command is used to output one message from the transmitter in
the POLL mode (see SMODE command).
Example:
>addr 7 <cr>
Address : 7
>smode poll <cr>
Serial mode : POLL
>close <cr>
line closed
send 7 <cr> (text invisible)
1013.25 hPa
28 ___________________________________________________________________ M210195EN-A
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CHAPTER 5________________________________________________________________ OPERATING
OPEN Setting a transmitter from POLL mode to STOP mode
CLOSE Setting a transmitter from STOP mode to POLL mode
OPEN a <cr> CLOSE <cr>
where:
a = the address of the transmitter (0...99)
These commands are used to set a transmitter temporarily to STOP
mode and back to POLL mode again. The OPEN command is useful
when several transmitters are connected to one serial bus and
communication with a single transmitter is needed. The CLOSE
command is a global command and requires no address.
The PTU200 series transmitters must always be closed after the POLL
mode selection. The RESET command and powering-up will close the
PTU200 series transmitters automatically.
>addr 7 <cr>
Address : 7 <cr>
>smode poll <cr>
Serial mode : POLL
>close <cr>
line closed
Example of opening and closing a transmitter with address 7:
open 7 <cr> (text invisible)
PTB 7 line opened for operator commands
>
Any commands (except for the ? command) can now be used for the
transmitter with address 7 without affecting other transmitters with
different addresses connected to the same serial interface. However, if
the RESET command is given or the transmitter is powered-up, the
transmitter will automatically return to the POLL mode.
Example of closing a transmitter:
>close <cr>
line closed
VAISALA _________________________________________________________________________ 29
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USER'S GUIDE_______________________________________________________________________
SEND mode
In the SEND mode, the transmitter will automatically output one
message at power-up or when triggering the transmitter on using pin 4
of the transmitter. The trigger signal must be a TTL level signal. TTL
HIGH (5 VDC) turns the transmitter ON and TTL LOW (0 VDC)
turns the transmitter OFF.
Examples of outputting with the prompt (ECHO ON) and without the
prompt (ECHO OFF):
>echo <cr>
Echo : ON
>smode send <cr>
Serial mode : SEND
>reset <cr>
1013.25 hPa
>
>echo off <cr>
Echo : OFF
reset <cr> (text invisible)
1013.25 hPa
Example of outputting a minimum amount of (six) characters by
excluding the <cr> and <lf> characters, the pressure unit and the
decimal point with the FORM command:
>form <cr>
4.2P""UUUU \r \n
? 6.0 P <cr>
>unit Pa
P unit : Pa
>smode send <cr>
Serial mode : SEND
>echo off <cr>
Echo : OFF
reset <cr> (text invisible)
101325
or
(power-up)
101325
30 ___________________________________________________________________ M210195EN-A
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
CHAPTER 6 CALIBRATION AND
ADJUSTMENT
Pressure
The user can select a simple offset or a two-point offset and gain
adjustment and use the LCI command for adjustment of pressure
transducer. The MPCI command is used for the more sophisticated
multipoint correction capability at up to eight pressure levels.
NOTE
Check first what linear corrections the transmitter is currently using
before attempt to readjust the transducer. As the previous linear
corrections will disappear when new linear corrections are input, the
user has to take into account the previous linear corrections when
deciding about the new ones.
Entering new linear or multipoint corrections will always cancel the
previous corrections. It is advisable to write down the previous linear
and multipoint corrections so that they will not be lost by mistake.
Entering new linear or multipoint corrections or changing their status
will also automatically cancel the date of calibration of the
transmitter (see CALD command).
TABL E 6-1 Adjustment and calibration commands
Function Command
listing corrections CORR
linear corrections on/off LC ON/OFF
multipoint corrections on/off MPC ON/OFF
entering multipoint corrections MPCI
calibration date CALD
The linear and multipoint corrections are protected by switch SW4
(see figure 6.2). The switch SW4 is normally in write DISABLE
position (OFF) and the user must change it to write ENABLE position
VAISALA _________________________________________________________________________ 31
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USER'S GUIDE_______________________________________________________________________
1
(ON) to be able to enter new linear and multipoint corrections to the
transmitter.
ON
S
OFF
SW3
SW5
SW6
SW7
SW8
NOTE
SW1
FIGURE 6-1 Switch SW4 in write ENABLE position (ON)
SW2
SW4
Always remember to return the switch SW4 to write DISABLE
position (OFF).
CORR Listing linear and multipoint pressure corrections
CORR <cr>
The CORR command is used to indicate the status of linear and
multipoint pressure corrections. In case the status is ON, the
corrections and valid date of calibration are listed. The listing varies
according to the number of transducers in the transmitter. The
transmitter lists * in the second column if there exists only one
pressure transducer in the transmitter.
Example of the listing of a transmitter with one pressure transducer:
>corr
Linear adjustments ON
Reading Correction Reading Correction
500.010 0.120*******.**********.***
1100.320 0.150*******.**********.***
Multipoint adjustments ON
Reading Correction Reading Correction
499.660 -0.110*******.**********.***
599.110 -0.080*******.**********.***
698.580 -0.060*******.**********.***
800.950 -0.030*******.**********.***
900.400 0.010*******.**********.***
947.200 0.020*******.**********.***
999.840 0.050*******.**********.***
1099.090 0.070*******.**********.***
32 ___________________________________________________________________ M210195EN-A
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
Transducer 2
CORRECTIONS:
TXD0,TXD1,TXD2 : -0.12000 1.00000 0.00000
V0XD0,V0XD1,V0XD2: 0.00000 1.00000 0.00000
V1XD0,V1XD1,V1XD2: 0.00000 1.00000 0.00000
Calibration date 1998-12-11
>
LC Linear pressure corrections
LC x <cr>
where:
x = ON or OFF
The LC command is used to activate or deactivate the linear offset or
offset/gain pressure corrections. Plain command LC outputs the linear
corrections in use.
NOTE
NOTE
The linear corrections are protected with switch SW4 (see FIGURE 6-1)
Turn the switch SW4 to write ENABLE position (ON) to be able to
turn the linear corrections on or off.
Changing the linear corrections on or off will automatically cancel the
date of calibration of the transmitter.
The listing varies according to the number of pressure transducers.
Example of linear adjustments performed on a transmitter with two
transducers:
>lc off <cr>
Linear adj. : OFF
>lc on <cr>
Linear adj. : ON
>lc <cr>
Reading Correction Reading Correction
1013.250 -0.100 800.000 0.050
1013.250 -0.100 1000.000 -0.020
>
Always remember to return the switch SW4 to write DISABLE
position (OFF).
VAISALA _________________________________________________________________________ 33
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USER'S GUIDE_______________________________________________________________________
LCI Entering linear pressure corrections
LCI n <cr>
where:
n = number of the pressure transducer (1 or 2)
The LCI command is used to enter new linear offset and offset/gain
pressure corrections to the transmitter. Note that the linear corrections
are given to each pressure transducer separately.
Entering new linear corrections is protected by switch SW4. Turn the
switch SW4 to write ENABLE position (ON) to be able to enter new
linear and multipoint corrections to the transmitter.
Deactivate the previous corrections by using the LC OFF. Precalibration of the transmitter then gives the required new corrections.
NOTE
The new linear corrections will always cancel the previous
corrections as well as the valid date of calibration of the transmitter
(see CALD command).
Activate the new linear corrections with the LC ON command. Use
ESC to abort without executing the command.
In the following, an example of performing an offset adjustment for
pressure transducer P1 and an offset and gain adjustment for pressure
transducer P2 is given.
>lc off <cr>
Linear adj. : OFF
>lci 1 <cr>
P1 1. reading ? 1013.25 <cr>
correction ? -0.1 <cr>
P1 2. reading ? <cr>
>lci 2 <cr>
P2 1. reading ? 800.00 <cr>
correction ? 0.05 <cr>
P2 2. reading ? 1000.00 <cr>
correction ? -0.02 <cr>
>lc on <cr>
Linear adj. : ON
Reading Correction Reading Correction
1013.250 -0.100 800.000 0.050
1013.250 -0.100 1000.000 -0.020
>
NOTE
Always remember to return the switch SW4 to write DISABLE
position (OFF).
34 ___________________________________________________________________ M210195EN-A
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
MPC Multipoint pressure corrections
MPC x <cr>
where:
x = ON or OFF
The MPC command is used to activate or deactivate the multipoint
corrections. Plain command MPC outputs the corrections in use.
The multipoint corrections are protected with switch SW4 (see FIGURE
6-1). Turn the switch SW4 to write ENABLE position (ON) to be able
to turn the multipoint corrections on or off.
NOTE
Changing the multipoint corrections on or off will automatically
cancel the previous date of calibration of the transmitter (see CALD
command).
Example of multipoint adjustments performed on a transmitter with
one pressure transducer:
>mpc off <cr>
Multipoint adj: OFF
>mpc on <cr>
Multipoint adjustments ON
>mpc<cr>
Reading Correction Reading Correction
499.660 -0.110*******.**********.***
599.110 -0.080*******.**********.***
698.580 -0.060*******.**********.***
800.950 -0.030*******.**********.***
900.400 0.010*******.**********.***
947.200 0.020*******.**********.***
999.840 0.050*******.**********.***
1099.090 0.070*******.**********.***
Multipoint adj: ON
>
NOTE
Always remember to return the switch SW4 to write DISABLE
position (OFF).
VAISALA _________________________________________________________________________ 35
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USER'S GUIDE_______________________________________________________________________
MPCI Entering multipoint pressure corrections
MPCI n <cr>
where:
n = number of the pressure transducer (1 or 2)
The MPCI command is used to enter new multipoint corrections to the
transmitter. Note that the user must give the multipoint corrections to
each pressure transducer separately.
Turn the switch SW4 to write ENABLE position (ON) to be able to
enter new linear and multipoint corrections to the transmitter.
Deactivate the previous corrections first using the LC OFF and/or
MPC OFF commands. Precalibration of the transmitter then gives the
required corrections.
NOTE
When entering new multipoint corrections, always start at the lowpressure end and then go up the pressure range.
The new multipoint corrections will always cancel the previous
corrections as well as the valid date of calibration of the transmitter
(see CALD command).
Use ESC to abort without executing the command. The new
multipoint corrections are activated with the MPC ON command.
In the following, an example of performing a multipoint adjustment
for pressure transducer P1 is given.
>lc off <cr>
Linear adj. : OFF
>mpc off <cr>
Multipoint adj: OFF
>mpci 1 <cr>
P1 1. reading ? 499.72 <cr>
correction ? -0.07 <cr>
P1 2. reading ? 599.20 <cr>
correction ? -0.08 <cr>
P1 3. reading ? 698.71 <cr>
correction ? -0.01 <cr>
P1 4. reading ? 801.12 <cr>
correction ? -0.01 <cr>
P1 5. reading ? 900.61 <cr>
36 ___________________________________________________________________ M210195EN-A
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
correction ? -0.03 <cr>
P1 6. reading ? 947.42 <cr>
correction ? -0.02 <cr>
P1 7. reading ? 1000.10 <cr>
correction ? -0.04 <cr>
P1 8. reading ? 1099.58 <cr>
correction ? -0.04 <cr>
>mpc on <cr>
Multipoint adj: ON
>
NOTE
Always remember to return the switch SW4 to write DISABLE
position (OFF).
CALD Storing the date of calibration
CALD yyyy-mm-dd <cr>
This command is used to store the date of calibration in the memory
of the transmitter.
Example:
>cald <cr>
Calibration date ????-??-??
>cald 1997-01-01 <cr>
Calibration date 1997-01-01
>
Changing the status (ON/OFF) of the linear or multipoint corrections
or entering new linear or multipoint corrections will automatically
cancel the date of calibration.
NOTE
VAISALA _________________________________________________________________________ 37
position (OFF).
Always remember to return the switch SW4 to write DISABLE
Page 42
USER'S GUIDE_______________________________________________________________________
Humidity
Calibration of the HMP45A-P/D probes should be performed at
regular intervals, depending on the conditions of use and desired
accuracy. The recommended calibration interval is one year.
The HMP45A-P/D probes are easy to maintain, calibrate and adjust.
The probe consists of a probe head and a handle with cable. All
calibration electronics are in the probe head, which can be
disconnected from the handle without disconnecting the wires. The
probe heads are interchangeable.
T
D
W
FIGURE 6-2 Adjustment trimmers and probe head connection/
Humidity adjustment
For a high-accuracy two-point adjustment, use a Vaisala HMK15 or
HMK13B calibrator and saturated salt solutions as described in the
respective manuals. If there is no local display, read the outputs via
the serial line.
Leave the calibrator and the probe head in the same space for at least
four hours so that their temperatures have time to equalize. Unscrew
the plastic grid of the probe.
The adjustment is done first for the dry end and then for the wet end
with trimmer potentiometers marked “D” (dry, <50 %RH) and “W”
(wet, >50 %RH). The potentiometers are located under a protective
plug; see FIGURE 6-2. Use a ceramic screwdriver with 2.5 mm blade for
adjusting the potentiometers. Note: if zero point is adjusted in
Nitrogen (N2), the minimum output signal of 0.008 V corresponds to a
relative humidity of 0.8 %RH.
pull the probe head
off the handle
disconnection
adjustment trimmers:
W = wet D = dry
(T for factory use only!)
TABL E 6-2 Greenspan’s calibration table
Temperature °C 15 20 25 30 35
LiCl %RH *) 11.3 11.3 11.3 11.3
NaCl %RH 75.6 75.5 75.3 75.1 74.9
K2SO
4
*) Do not use or store the LiCl solution in temperatures below +18°C as its humidity
equilibrium may change permanently
38 ___________________________________________________________________ M210195EN-A
%RH 97.9 97.6 97.3 97.0 96.7
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
As the D (dry) and W (wet) adjustments may affect each other, check
again the humidity reading at the low end. If needed repeat the
procedure in low and high ends until the reading is correct.
Temperature
The temperature channels of PTU200 transmitters are very stable and
the probes have been calibrated and adjusted at the factory. Unless
there is a strong reason to believe that the adjustments have changed,
DO NOT perform a temperature adjustment. This is a very demanding
procedure and requires extremely accurate references. Furthermore, it
is important to allow enough time for the stabilization during
calibration. If for some reason, it is necessary to perform the
temperature adjustment, follow attentively the instructions given
below.
NOTE
NOTE
Offset
The temperature channel has to be calibrated if the probe head has
been changed.
The temperature adjustment can be done via the serial line using linear
offset and gain corrections. Entering any corrections is protected by
switch SW4. Turn it to write ENABLE position (ON) to be able to
enter new offset and gain corrections.
If there is need for an adjustment, check first whether there exist any
previously set corrections. Before entering new corrections, it is
recommended to set the offset to 0 and the gain to 1. Then measure
the temperature again at two reference points, and calculate the new
offset and gain corrections.
It is recommended to perform the one-point offset correction in
temperature, which is close to average measurement temperature. The
offset can be calculated by using equation 6-1.
TTOffset −= (6-1)
measref
where:
= T measured with an accurate reference thermometer
T
ref
T
= T measured with PTU200
meas
VAISALA _________________________________________________________________________ 39
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USER'S GUIDE_______________________________________________________________________
()(
)
Gain
Example: T
= 23.15°C
ref
T
meas
= 23.28°C
Offset = -0.13°C
The gain correction can be calculated with the equation 6-2. It is
reasonable to use the low (T1) and the high (T2) end of needed
temperature range.
−−−
TTTT
measrefmeasref
Gain
1
+=
1
1
1
2
−
TT
measmeas
2
2
(6-2)
where:
T
= measured with a reference thermometer at temperature T
T
T
T
ref1
ref2
meas1
meas2
= measured with a reference thermometer at temperature T
= measured with PTU200 at temperature T
= measured with PTU200 at temperature T
1
2
1
2
Example:
T
= -14.97°C and T
ref1
T
= +30.12°C and T
ref2
= -14.90°C
meas1
meas2
=+30.29°C
Gain = 0.99779
Offset = T
-Gain*T
ref2
meas2
= -0.10
T = 0.99779 * 30.29°C - 0.10 = 30.12°C
TXCI Entering corrections for HMP45D and PT100 temperature measurement
TXCI x
where:
x = 2 if there is one pressure transducer installed
3 if there is two pressure transducers installed
The TXCI command is used to enter new offset and offset/gain
corrections for temperature measurement of HMP45D and PT100.
40 ___________________________________________________________________ M210195EN-A
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CHAPTER 6_______________________________________________ CALIBRATION AND ADJUSTMENT
>txci
TXD0 : -1.199999971E-01 ? -0.10<cr> (offset)
TXD1 : 1.000000000E+00 ? 0.99779<cr> (gain)
TXD2 : 0.000000000E-01 ?<cr> (factory use only)
>
The factory setting TXD2 is passed by pressing enter. Use ESC to
abort without executing the command.
Reset the transmitter to activate the given corrections.
NOTE
Always remember to return the switch SW4 to write DISABLE
position (OFF).
V0XCI Entering corrections for HMP45A-P temperature measurement
V0XCI x
where: x = 2 if there is one pressure transducer installed
3 if there is two pressure transducers installed
The V0XCI command is used to enter new offset and offset/gain
corrections for temperature measurement of HMP45A-P.
Entering new corrections is protected by switch SW4. Turn it to write
ENABLE position (ON) to be able to enter new offset/gain
corrections.
The factory setting V0XD2 is passed by pressing enter. Use ESC to
abort without executing the command.
Reset the transmitter to activate the given corrections.
In the following, an example of performing an offset and gain
adjustment:
>V0XCI 2
V0XD0 : 0.000000000E-01 ? -0.10<cr>
V0XD1 : 1.000000000E+00 ? 0.99778<cr>
V0XD2 : 0.000000000E-01 ?<cr>
>
NOTE
Always remember to return the switch SW4 to write DISABLE
position (OFF).
VAISALA _________________________________________________________________________ 41
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Page 47
CHAPTER 7____________________________________________SELF-TESTING AND PROBLEM HANDLING
1
CHAPTER 7 SELF-TESTING AND
PROBLEM HANDLING
Returning the serial communication parameters
To restore factory software and hardware settings, set the dip switch
S1 on the CPU board as in FIGURE 7-1. Other switches except the SW8
must be OFF. In addition, the serial interface has to be set for basic RS
232C operation according to FIGURE 7-1. With these selections, one
single transmitter can be operated through the RS 232C serial
interface using factory serial bus settings as in TABLE 7-1. Returning
the SW8 to OFF will restore the original, application specific software
settings.
RX/RXD
RXD
ON
OFF
SW3
SW5
SW1
FIGURE 7-1 Factory settings for the dip switch S1 and Basic RS
SW2
SW4
SW7
SW6
SW8
S
TX
TXD
TXD
X15
232C settings
TABL E 7-1 Serial interface factory settings
Baud rate 9600
Parity even
Data bits 7
Stop bits 1
Duplex full duplex
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USER'S GUIDE_______________________________________________________________________
Diagnostic commands
The PTU200 series digital transmitters respond to a set of diagnostic
commands, which are useful for analyzing the basic settings and
general operation of the transmitters. The diagnostic commands are
listed in
TABL E 7-2 Diagnostic commands
Function Command
basic information on settings ?
software version VERS
serial number SNUM
outputting error messages ERRS
? Basic information on the transmitter settings
? <cr>
The ? command lists the basic information of the transmitter.
>?
Software version PTU200 / 1.02
Serial number T5030004
Configuration 12
Linear adjustments ON
Multipoint adjustments ON
Calibration date 1999-03-12
Baud Parity Data Stop Dpx 9600 E 7 1 F
Echo ON
Sending mode STOP
Address 0
Output interval 3 s
Output format 4.1P""UUU""2.1RH""UUU#r#n
Error output format
SCOM format
Pressure unit hPa
Temperature unit 'C
Transducer 1:
TYPE: PMT
Transducer 2:
TYPE: VMT
Transducer 3:
TYPE: NONE
>
NOTE
Use this command only for one transmitter at a time. Any PTU200
series transmitter will always respond to ?-command whatever its
settings are, provided that the serial interface settings are correct.
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CHAPTER 7____________________________________________SELF-TESTING AND PROBLEM HANDLING
VERS Software version
VERS <cr>
The VERS command is used to output the software version of the
transmitter.
>vers <cr>
PTU200 / 1.01
>
SNUM Serial number
SNUM <cr>
The SNUM command is used to output the serial number of the
transmitter.
>snum
CPU serial no : T2210005
TR1 serial no : 0
TR2 serial no : 0
TR3 serial no : 0
CTR1 serial no : 0
CTR2 serial no : 0
CTR3 serial no : 0
>
ERRS Error message output
ERRS <cr>
The ERRS command is used to print the error messages. The
command outputs an error code and an error description:
>errs <cr>
E00 Nothing special to report
>
Complete list of error codes:
E00 Nothing special to report
E10 CPU EEPROM ackn. error
E20 CPU EEPROM csum error
E11 TR1 Transducer not present
E21 TR1 EEPROM csum error
E31 TR1 serial number error
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E41 TR1 f out of range
E51 TR1 y-value out of range
E61 TR1 pressure out of range
E71 TR1 P difference too large
E12 TR2 Transducer not present
E22 TR2 EEPROM csum error
E32 TR2 serial number error
E42 TR2 f out of range
E52 TR2 y-value out of range
E62 TR2 pressure out of range
E72 TR2 P difference too large
E13 TR3 Transducer not present
E23 TR3 EEPROM csum error
E33 TR3 serial number error
E43 TR3 f out of range
E53 TR3 y-value out of range
E63 TR3 pressure out of range
E73 TR3 P difference too large
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CHAPTER 8_________________________________________________________ TECHNICAL DATA
CHAPTER 8 TECHNICAL DATA
Barometric pressure
Operating range
Pressure ranges 500 ... 1100 hPa, 50...1100 hPa
Accuracy class
Pressure range 500...1100 hPa 50...1100 hPa
class A class B
Linearity * ± 0.05 hPa ± 0.10 hPa
Hysteresis * ± 0.03 hPa ± 0.03 hPa
Repeatability * ± 0.03 hPa ± 0.03 hPa
Calibration uncertainty ** ± 0.07 hPa ± 0.15 hPa
Accuracy at +20 *C *** ± 0.10 hPa ± 0.20 hPa
Temperature dependence**** ± 0.1 hPa ± 0.1 hPa
Total accuracy including
one year drift ± 0.15 hPa ± 0.25 hPa
Long-term stability ± 0.1 hPa / year
Response time (100% response) class A class B
one sensor 2 seconds 1 second
* Defined as the ±2 standard deviation limits of end-point nonlinearity, hysteresis error or repeatability error.
** Defined as ±2 standard deviation limits of inaccuracy of the
working standard including traceability to NIST.
± 0.20 hPa
± 0.08 hPa
± 0.08 hPa
± 0.20 hPa
± 0.30 hPa
± 0.30 hPa
± 0.45 hPa
± 0.20 hPa/year
*** Defined as the root sum of the squares (RSS) of end-point nonlinearity, hysteresis error, repeatability error and calibration
uncertainty at room temperature.
**** Defined as ±2 standard deviation limits of temperature
dependence over the operating temperature range.
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C
Humidity
Measurement range 0.8 ... 100 %RH
Accuracy at +20 °C (incl. non-linearity and hysteresis)
against factory references ±1 %RH (0...90 %RH)
±2 %RH (90...100 %RH)
field calibration against
references ±2 %RH (0...90 %RH)
±3 %RH (90...100 %RH)
Typical long-term stability < 1 %RH / year
Temperature dependence ±0.05 %RH/ °C
Response time (90%)at +20 °C 15 s with membrane filter
®
Humidity sensor HUMICAP
180
Temperature
HMP45A-P & HMP45D
Measurement range -36 ... +60 °C (HMP45A-P)
Accuracy at 20°C ±0.2 °C
Accuracy over the whole measurement range:
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-40
-30
Temperature sensor
HMP45A-P Pt 1000 IEC 751 1/3 Class B
HMP45D Pt 100 IEC 751 1/3 Class B
Pt100 sensor head
-20
-10 0
-40 ... +60 °C (HMP45D)
10
20
30
40
50 60
°
Measurement range -40 ... +60 °C
Accuracy over
the whole measurement range ±0.2 °C
Temperature sensor Pt 100 IEC 751 1/4 Class B
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CHAPTER 8_________________________________________________________ TECHNICAL DATA
General
(* factory settings)
Temperature range
operating -40 ... +60 ºC
with local display 0 ... +60 ºC
storage -40 ... +60 ºC
with local display -20 ... +60 ºC
Humidity range non-condensing
Supply voltage 10 ... 30 VDC, reverse polarity
protected
Supply voltage sensitivity negligible
Current consumption less than 30 mA
with local display less than 30 mA (without
backlight)
less than 50 mA (with backlight)
hardware shutdown mode less than 0.1 mA
Serial I/O full duplex RS 232C * or
bidirectional TTL level or
half duplex two-wire RS 485/422
code ASCII
parity even*, odd, none
data bits 7* or 8
stop bits 1* or 2
Baud rates 300, 600, 1200, 2400, 4800, 9600*
Electrical connections
excitation supply, GND, CTRL (for
shutdown)
serial communication TX, RX, GND, TXD, RXD, GND,
TXD inverted, RXD inverted,
GND, RS 485/422HI,
RS485/422LO
Units
pressure hPa*, kPa, Pa, mbar, bar, inHg,
mmHg, torr, mmH2O, psia
humidity %RH
temperature °C*, °F
Resolution 0.1 hPa*, 0.1 %RH, 0.01 °C
Settling time at power-up class A class B
one pressure sensor 6 seconds* 5 seconds*
Acceleration sensitivity negligible
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Mechanics
Transmitter body
Pressure connector M5 (10-32) internal thread
Pressure fitting barbed fitting for 1/8" I.D. tubing
Optional quick connector with shut off valve for 1/8" I.D.
tubing
Maximum pressure limit 5000 hPa abs.
Minimum pressure limit 0 hPa
Electrical connector female 9-pin subD-connector
Housing epoxy painted aluminium
HMP45A-P and HMP45D
Housing ABS plastic
Probe cable length
HMP45A-P 20 m
HMP45D 3.5 m
Housing classification IP 65 (NEMA 4)
Sensor protection (standard) membrane filter, part no. 2787HM
PT100 sensor head
Cable length 2 m
Weight
PTU200 with HMP45A-P 2.3 kg
PTU200 with HMP45D 1.3 kg
PTU200 with Pt100 sensor head 1.1 kg
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CHAPTER 8_________________________________________________________ TECHNICAL DATA
Dimensions
Transmitter body
120 (4.72)
65 (2.56)
25.6 (1.01)
145 (5.71)
133 (5.24)
6.5 (0.26)
HMP45A-P & HMP45D
A-A
20.5
(0.81)
104 (4.09)
120 (4.72)
139.5 (5.49)
240 (9.45)
11 8 (4.65)
A
A
24
(0.94)
18.5
( 0.72)
(0.94)24
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USER'S GUIDE_______________________________________________________________________
Pt100 sensor head
(2.40)
64
ø
3.1
(0.12)
ø6
(0.24)
93
5
ø
(0.22)
(3.66)
5
.
Electromagnetic compatibility
EN 61326-1:1997 +Am 1:1998, Electrical equipment for measurement,
control and laboratory use - EMC requirements; Generic environment.
Test methods:
Emission
Radiated emissions CISPR16 class B (CISPR22 Class B)
Immunity
Electrostatic discharge (ESD) EN/IEC 61000-4-2
EM field EN/IEC 61000-4-3
EFT Burst EN/IEC 61000-4-4
Surge EN/IEC 61000-4-5
Conducted RF EN/IEC 61000-4-6
Accessories
Order code Description
PTU200MIK outdoor installation kit
PTU200TRIPOD tripod stand for outdoor installation
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APPENDIX A ____________________ OPTIONAL RS485/422 INTERFACE OF PTU200 TRANSMITTERS
APPENDIX A OPTIONAL RS485/422 INTERFACE OF
PTU200 TRANSMITTERS
The two-wire non-isolated half duplex RS 485/422 serial interface is
the recommended way of connecting the PTU200 series transmitters
with other intelligent transmitters.
HI
HOST
COMPUTER
HI
RX/TX
LO
RX/TX
LO
HI
RX/TX
LO
HI
RX/TX
LO
DYNAMIC LINE TERMINATION REQUIRED
IF NO DEVICE AT THE END OF THE BUS
120R
33nF
PTB220
...........
...........
NOTE
At the ends of the serial bus there must be a PTU200 series
transmitter, a dynamic line adapter (120 ohm resistor in series with a
33 nF capacitor) or a line master. If a branch line is made with a
junction box, the branch should be shorter than 3 meters.
When using PTU200 series transmitters on RS485/422 interface select
half duplex operation, set an address for each transmitter and activate
the POLL/CLOSE mode. The transmitters can then be polled by the
SEND a command or by using the OPEN/POLL commands. The time
interval setting allows to enter a stop (S) command if a continuous
outputting (R) command has been given by mistake (see page 18).
1. The sending of PTU200 is controlled with XON/OFF (software
handshaking).
2. The buffer of the transmitter can be cleared with <cr>.
Example of required software commands:
>seri <cr>
9600 E71F
>seri H <cr> (select half duplex serial operation)
9600 E71H
>intv 1 s <cr> (select at least 1 second outputting interval)
Output intrv. : 1 s
>addr 7 <cr> (select address of the transmitter)
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Address : 7 <cr>
>smode poll <cr> (select the POLL mode)
Serial mode : POLL
>reset <cr> (resetting will activate the new ettings)
(no title will appear after reset in POLL mode)
send 7 <cr> (text invisible)
1013.25 hPa
The next picture (below) shows typical RS485/422 differential input
signals RS485/422 LO (upper signal) and RS485/422 HI (lower
signal) at baud rate 9600. The vertical scale is 2V/div for both signals.
The ground level for each signal is shown with a small arrow at the
right. At the left the signals are at rest.
The next picture (below) shows typical RS485/422 differential output
signals RS485/422 LO (upper signal) and RS485/422 HI (lower
signal) at baud rate 9600. The vertical scale is 2V/div for both signals.
The ground level for each signal is shown with a small arrow at the
right. At the left the signals are at rest.
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APPENDIX A ____________________ OPTIONAL RS485/422 INTERFACE OF PTU200 TRANSMITTERS
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APPENDIX B ASHTECH PORT A/B 16 PIN CONNECTOR
DATA TO PTU200
DATA FROM PTU200
TO ASHTECH Z-12 (PORT A/B)
FISCHER 104-SERIES
16 PIN CONNECTOR (MALE)
SHIELD SHIELD
1
TX
RX
RTS
CTS
DSR
SGND
DCD
DTR
GND
PWR
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TO PTU200
D-SUB
9 PIN CONNECTOR (MALE)
1
2
3
4
5
6
7
8
9
TX
RX
GND (RS232)
GND (Supply)
10...30VDC Supply
DATA TO Z-12
DATA FROM Z-12
FIGURE B-1 Pin assignments between the PTU200 and an Ashtech
Z-12 type receiver (serial number LPxxxxxxx).
TO ASHTECH Z-12 (PORT A/B)
FISCHER 104-SERIES
16 PIN CONNECTOR (MALE)
TO PTU200
D-SUB
9 PIN CONNECTOR (MALE)
DATA TO PTU200
DATA FROM PTU200
SHIELD SHIELD
1
2
3
4
5
6
7
8
9
DATA TO Z-12
TX
RX
DATA FROM Z-12
GND (RS232)
GND (Supply)
10...30VDC Supply
TX
RX
RTS
CTS
DSR
SGND
DCD
DTR
GND
PWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
10...30VDC Supply voltage
FIGURE B-2 Pin assignments between the PTU200 and an older
Ashtech Z-12 type receiver.
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APPENDIX B ________________________________________ ASHTECH PORT A/B 16 PIN CONNECTOR
The pin assignment of PTU200 for RS232 is as follows:
PIN SIGNAL
1
2 TX
3 RX
4
5 GND (RS 232C)
6
7 GND (Supply)
8
9 10...30 VDC Supply voltage
NOTE
NOTE
To be compatible with the PTU200 the receiver must have a MET
option.
To ensure that the pin 16 of the receiver can be used for powering the
PTU200, measure its voltage with a multimeter.
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APPENDIX C NMEA DATA FORMAT
The PTU200 transmitter can be used in a connection with a GPS receiver. It
responds to a GPS input command by outputting a single predefined NMEA
format message or the transmitter serial number.
NOTE
NOTE
Example 1:
"$PASHS,XDR,P,"1.5_P_",B,"_SN_",C,"_3.2_TH_",C,"_SN_",H,"_RH_",P,"_SN_#r #n
where,
"$PASHS,XDR,P," text field $PASHS,XDR,P, (P transducer type = pressure)
1.5 number field
P pressure
",B," text field (B transmitter unit = Bar)
SN transmitter ID (serial number)
",C," text field (C transducer type = temperature)
3.2 number field
TH or T temperature (see also page 13)
",C," text field (C temperature unit = degrees Celcius)
SN transmitter ID (serial number)
",H," text field (H transducer type = humidity)
RH humidity
",P," text field (P humidity = % relative humidity)
SN transmitter ID (serial number)
\r\n CR LF
_ space
The pressure unit has to be set as bar when the NMEA data output
format is used.
The maximum length of FORM is 80 characters.
Please check that the transmitter has the same serial bus settings as the
GPS receiver. It is recommended to use baud rate less than 9600.
FORM ... <cr>
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APPENDIX C ________________________________________________________NMEA DATA FORMAT
Output format:
>send<cr>
$PASHS,XDR,P,0.99710,B,S1630001,C,22.47,C.S1630001,H,20.84,P,S1660001
>
Example 2:
"$PASHS,XDR,P," 1.5_P_",B,,C,"_3.2_TH_",C,,H,"_RH_",P,"_#r_#n_
Output format:
>send<cr>
$PASHS,XDR,P,1.01148,B,,C, 27.11,C,,H, 54.29,P,
>
NOTE
Please note that the symbol for temperature depends on the probe type
of the PTU200 (see page 13).
GPS Commands
The PTU200 transmitter responds to following GPS specific application commands.
Example:
>*0100P9
$PASHS,XDR,P,1.01496,B,T5030004,C,24.42,C,T5030004,H,41.18,P,T5030004
>
Example:
*0100P9
*0200P9
>*0200P9
$PASHS,XDR,P,1.01496,B,T5030004,C,24.42,C,T5030004,H,41.18,P,T5030004
>
*9900P9
Example:
>*9900P9
$PASHS,XDR,P,1.01496,B,T5030004,C,24.42,C,T5030004,H,41.18,P,T5030004
>
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Serial number
*9900SN
This command is used to give the serial number output to a GPS receiver.
Example:
>*9900SN
T5030004
>
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