Related Manuals for Vaisala PTB 200 A
Summary of Contents for Vaisala PTB 200 A
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Page 1: Table Of Contents
PTB 200 1 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 PTB 200 DIGITAL BAROMETERS PRODUCT DESCRIPTION INSTALLATION 2.1 Mounting 2.2 Grounding 2.3 Power connections 2.4 Serial output mode connections 2.5 Pulse output mode connections 2.6 Pressure connections 2.7 Multiple barometers on one RS 232C bus SERIAL COMMANDS 3.1 General 3.2 Configuration commands... - Page 2 PTB200 Digital Barometer Appendix 1 SERIAL COMMANDS Function Command Comment serial bus settings SERI echo on/off ECHO output format FORM pressure resolution FORM units UNIT integration time MTIM, FILT settling time/response time MTIM, FILT sending mode SMODE STOP, RUN and POLL modes address ADDR for POLL mode only...
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Page 3: Product Description
PTB200-O0284-1.1 PRODUCT DESCRIPTION The PTB 200 A and PTB 201 A are fully compensated digital barome- ters designed to operate over a wide pressure and temperature range. The final factory adjustment and calibration of the PTB 200 A is done against a deadweight tester for best accuracy and pressure traceability. -
Page 4: Installation
PTB 200 3 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 INSTALLATION 2.1 Mounting The dimensions and recommended mounting positions of the PTB 200 barometers are shown in Figure 1. 145 (5.71) 133 (5.24) 120 (4.72) Fig. 1 Dimensions and mounting of PTB 200 barometers See Chapter 2.2 Grounding and 2.6 Pressure connection for further information on electrical grounding and pressure connection alternatives. -
Page 5: Grounding
PTB 200 4 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 2.2 Grounding A single electrical cable with a screen and five or six wires is recommended for power and serial bus connections. The cable diameter should be 5 ... 10 mm. The screen of the electrical cable must be grounded properly to achieve best possible EMC performance. -
Page 6: Power Connections
PTB 200 5 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 2.3 Power connections Two wires, one for supply voltage and another for supply ground, are needed to connect power to the barometer (see Fig. 3). POWER JUMPER normal use external control using CTRL line CTRL... -
Page 7: Serial Output Mode Connections
PTB 200 6 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 2.4 Serial output mode connections The serial communication can take place either using RS 232C or TTL level signals. In both cases the barometer is connected to the host system with three wires (TX, GND, RX) (see Figure 4). -
Page 8: Pulse Output Mode Connections
PTB 200 7 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 2.5 Pulse output mode connections (software version 1.05 or higher) The pulse output mode uses the same terminals as the serial output mode (see Figure 5). The transmitting terminal sends the pulse output (TX/PULSE) and the receiving terminal of the barometer receives the positive trigger signal (RX/PULSE TRIG). -
Page 9: Pressure Connections
PTB 200 8 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 The pulse frequency is about 4.5 kHz at baud rate 9600. The pulse output is triggered using a positive pulse (e.g. 100 ms/5 VDC). The pulse output voltage levels can be either RS 232C levels or TTL levels. The selection is made with a jumper (Fig. -
Page 10: Multiple Barometers On One Rs 232C Bus
PTB 200 9 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 2.7 Multiple transmitters on one RS 232C bus It is possible to connect up to 99 PTB 200 barometers to one RS 232C bus by using a connector box with diodes for each barometer transmission line and one common barometer receiving line and ground line (see Figure 6). -
Page 11: Serial Commands
(PTB 200 A: 2 s, PTB 201 A: 1 s) and high pressure resolution (PTB 200 A: 0.01 hPa, PTB 201 A: 0.1 hPa). If longer settling time can be... -
Page 12: Configuration Commands
PTB 200 11 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 The PTB 200 barometers have three sending modes: STOP, RUN and POLL modes. In STOP mode (factory setting) after power-up the barometer outputs its type code and software version number and then waits for further commands. - Page 13 PTB 200 12 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 Examples: >SERI<cr> 1200 >SERI 9600 E 1<cr> 9600 >RESET<cr> >SERI 1200<cr> 1200 >RESET<cr> Always give the RESET command after the SERI command to invoke the new serial bus settings. The following bus settings do not work with the barometer’s Intel 8051 microprocessor and are modified by the barometer: ⇒...
- Page 14 PTB 200 13 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 The basic definition consists of the current and new format: >FORM<cr> (current output format appears here) ? (type new format here)<cr> The output format consists of the pressure reading area, pressure unit area, carriage return and line feed, e.g.: "\PPPP.PP\ \uuuu\\r\n"...
- Page 15 25 milliseconds. The MTIM value can range from 4 to 255. The MTIM factory setting of the PTB 200 A is 64; this ensures a stable resolution of 0.01 hPa. The integration time is then 64 x 25 ms = 1600 ms.
- Page 16 PTB 200 15 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 FILT Setting the filter parameters FILT xxx yyyy<cr> where ON or OFF yyyy FAST or SLOW The FILT command is used to set additional numerical filtering modes. FAST mode introduces a multiplication factor of 4 to the integration time set with the MTIM command.
- Page 17 PTB 200 16 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 SMODE Setting the sending mode SMODE xxxx<cr> STOP and RUN modes only SMODE aa STOP<cr> POLL mode only where xxxx STOP, RUN or POLL the address (1...99) of the barometer in the POLL mode SMODE command sets or inspects the sending mode of the barometer.
- Page 18 PTB 200 17 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 ADDR Setting the barometer address (for POLL mode only) ADDR<cr> ADDR is used to set or inspect an address (1...99) of a barometer for the POLL mode. Example of setting the address 7: >ADDR<cr>...
- Page 19 PTB 200 18 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 SLEEP Setting and resetting the sleep mode SLEEP ON<cr> SLEEP OFF<cr> The SLEEP command is used to set and reset the software controlled sleep mode which cuts down the power consumption by over 60 %. In the sleep mode the current consumption is below 10 mA when no out- put is required and about 25 mA during output.
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Page 20: Operating Commands
PTB 200 19 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 3.3 Operating commands Starting the measurement output R<cr> Command R starts the measurement output. The command is used to start output in the STOP and RUN modes (see SMODE command) and in interval output mode (see INTV command). - Page 21 PTB 200 20 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 Example of outputting the current settings: >INTV<cr> Output intrv. : Example of setting an output interval and starting outputting: >INTV 1 min<cr> Output intrv. : 1 min >R<cr> Example of cancelling the interval output mode: >INTV 0 s<cr>...
- Page 22 When an error occurs in the barometer, give the following seven com- mands and print the responses on paper. On the basis of the re- sponses to these commands Vaisala can quickly determine which ac- tions to take. The commands are: >ERRS<cr>...
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Page 23: Adjustment And Calibration
PTB 200 22 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 ADJUSTMENT AND CALIBRATION The PTB 200 barometers can be adjusted and calibrated against local primary standards that have high accuracy and stability as well as known traceability to international standards. The PTB 200 barometers are recommended to be adjusted or calibrated once a year when used in automatic weather station applica- tions. -
Page 24: Offset And Gain Adjustment
PTB 200 23 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 The following pressure adjustments are possible: • offset adjustment • offset/gain adjustment • multipoint adjustment at up to eight pressure levels. Offset and offset/gain adjustments are made with the barometer connected to a reference pressure (see LP command). -
Page 25: Multipoint Adjustment
PTB 200 24 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 Example of an offset and gain adjustment: >LP<cr> Ref1 ? (set first pressure level and enter value here)<cr> (the current non-corrected value appears here) Ref2 ? (set second pressure level and enter value here)<cr>... - Page 26 PTB 200 25 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 First precalibrate the barometer at up to eight pressure levels. Then calculate the corrections (reference value minus PTB 200 barometer indication) at each pressure level and enter the corrections using the MPCI commands.
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Page 27: Technical Data
Operating temperature range -60 °C ... +60 °C Storage temperature range Humidity range non-condensing Note: 1 hPa = 1 mbar (see note below). ACCURACY PTB 200 A PTB 201 A Linearity * ±0.05 hPa ±0.15 hPa ±0.10 hPa Hysteresis * ±0.03 hPa... - Page 28 Pressure units hPa*, kPa, mbar, inHg, mmHg, torr, psia Baud rates 300, 600, 1200*, 2400, 4800, 9600 Resolution PTB 200 A 0.01 hPa* PTB 201 A 0.1 hPa* Settling time after power-up PTB 200 A 2 seconds* PTB 201 A...
- Page 29 PTB 200 28 (28) Digital Barometers SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1 Dimensions in mm (inches) 145 (5.71) 133 (5.24) 120 (4.72)
- Page 30 PTB200 Digital Barometer Appendix 1 SERIAL COMMANDS Function Command Comment serial bus settings SERI echo on/off ECHO output format FORM pressure resolution FORM units UNIT integration time MTIM, FILT settling time/response time MTIM, FILT sending mode SMODE STOP, RUN and POLL modes address ADDR for POLL mode only...