User manual VAISALA PTB210 SERIAL

[. . . ] USER'S GUIDE Digital Barometers with Serial Output PTB210 Series M210669EN-C PUBLISHED BY Vaisala Oyj P. O. Box 26 FIN-00421 Helsinki Finland Phone (int. ): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www. vaisala. com/ © Vaisala 2008 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale. ________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] All the barometers are digitally adjusted and calibrated by using electronic working standards. 1100 hPa also a higher accuracy barometer is available, which is fine-tuned and calibrated against a dead-weight tester. - The PTB210 can also be placed to a standard rail (DIN 35) by using the attachment plate and clip (B). Finally, attach the clip to the rail. A B Figure 3 Different Mounting Options of the PTB210 NOTE Always place the barometer so that the pressure fitting is downwards. VAISALA ________________________________________________________________________ 9 User's Guide ______________________________________________________________________ NOTE Check that the cable is not taken upwards from the barometer. This is to prevent water flowing along the cable, and gathering close to the feed-through. Figure 4 Recommended Cable Position The IP65-classified housing enables the barometer to be mounted outdoors without any additional protection. However, please take care that rainwater cannot plug the open pressure fitting. In such conditions, it is recommended to connect a piece of a tube with inner diameter of 4 mm or more to the fitting. It is also possible to use a static pressure head, SPH10/20, which protects the pressure channel from rain, and minimizes the effect of wind. Static Pressure Head Please note 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. In demanding wind conditions, it is recommended to use Vaisala's static pressure head, SPH10/20, to which the PTB210 digital barometers can be directly integrated. This combination provides for accurate measurement in all wind conditions. 10 __________________________________________________________________ M210669EN-C Chapter 3 _______________________________________________________________ Installation Connections There are three different serial output interfaces available with the PTB210 digital barometers: RS232C, RS485/232C, and RS232C/TTL. In following tables there are presented the connections of these output interfaces. RS232C Table 1 Connections of the PTB210 Barometer with RS232C Interface. Wire color Signal Grey RX Green TX Blue Ground Pink Supply voltage (5 . . . 28 VDC) Brown not connected White not connected Yellow External power control (TTL level: 1 = 5 V= off, 0 = 0 V= on) It is recommended to isolate the free wire ends. RS485 Connections of the PTB210 Barometer with RS485/RS232C Interface Wire color Signal Grey RX (with RS232C) Green TX (with RS232C) Blue Ground Pink Supply voltage (8 . . . 18 VDC) Brown RS485 White RS485 + Yellow External power control (TTL level: 1 = off, 0 = on) See also chapter "Setting the RS485 Terminating Resistor On/Off "on page 19. Table 2 NOTE The two output protocols cannot be used simultaneously. It is recommended to isolate the free wire ends. VAISALA _______________________________________________________________________ 11 User's Guide ______________________________________________________________________ RS232C/TTL Table 3 Connections of the PTB210 Barometer with RS232C/TTL Interface Wire color Signal Grey RX (with RS232C) Green TX (with RS232C) Blue Ground Pink Supply voltage (5 . . . 28 VDC) Brown RXD (TTL level) White TXD (TTL level) Yellow External power control (TTL level: 1 = off, 0 = on) NOTE The two output protocols cannot be used simultaneously. It is recommended to isolate the free wire ends. 12 __________________________________________________________________ M210669EN-C Chapter 4 ________________________________________________________________ Operating CHAPTER 4 OPERATING General The PTB210 series barometers can be operated through a serial line by using suitable terminal software like Windows® Hyper Terminal, and the commands given in following pages. The format of the commands is: . ZZZ. xxx<cr>, where ZZZ defines an event and xxx is the given value of a parameter. When there are several barometers on same line, it is necessary to use an instrument-specific identification code in front of the command e. g. This prevents any inconsistency between the barometers and the host system. A barometer reacts only to a command with its ID, or the one that is given without the code. [. . . ] It is advisable to write down the previous multi-point corrections so that they will not be lost by mistake. The corrections are given by using the Wizard software; available for download at http://www. vaisala. com/PTB210Wizard/. When the new multi-point corrections have been entered to the barometer, the corrections are activated either with the Wizard or with the MPCON command. Finally, the barometer is calibrated to verify its real accuracy. VAISALA _______________________________________________________________________ 21 User's Guide ______________________________________________________________________ Wizard Software The user-friendly Wizard software is designed to work in WIN3. X, WIN95, and NT environment. [. . . ]