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Related Manuals for Honeywell PPT2
Summary of Contents for Honeywell PPT2
- Page 1 Chipsmall Limited consists of a professional team with an average of over 10 year of expertise in the distribution of electronic components. Based in Hongkong, we have already established firm and mutual-benefit business relationships with customers from,Europe,America and south Asia,supplying obsolete and hard-to-find components to meet their specific needs.
- Page 2 Honeywell Precision Pressure Transducer 2 PPT2 User’s Manual...
- Page 3 Honeywell reserves the right to make changes to any products or technology herein to improve reliability, function or design. Honeywell does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
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Page 4: Table Of Contents
7.0 Installation Recommendations, Cautions and Materials of Construction ..77 8.0 Firmware Errata ..................79 Appendix A: PPT2 Binary Command Format for P3 and P4 Commands: ..80 Appendix B: ASCII Table ..................83 Appendix C: Setting an Analog Pressure Set Point ..........84 Appendix D: RAM Initialization ................ -
Page 5: Product Overview
USB converter can be used to provide the required RS-232 or RS-485 port.) Using the RS-232 type PPT2, up to 89 units can be connected in a ring configuration to a single serial port of a computer. The RS-485 type PPT2 allows up to 89 PPT2’s to be connected to a two-wire multi-drop bus. Group (multicast) addressing allows up to nine groups of PPT2’s to be addressed with a single command. -
Page 6: Getting Started
Turn the local echo ON. When shipped from the factory, the PPT2 is set to a baud rate of 9600, 1 start bit, 8 data bits with no parity and 1 stop bit. If the baud rate has been subsequently changed, and is unknown, it will be necessary to search all baud rate values to reestablish communication. - Page 7 Once the wiring connections and terminal program settings are complete, the PPT2 will automatically send the following response (or similar to) when power is applied. This reply will be generated any time power to the PPT2 is cycled off and on.
- Page 8 Note: The “?” indicates the response from a null addressed PPT2– one which has not been assigned a device ID. A null address, 00, is coded into each PPT2 at the factory. Refer to the ID command in Section 5 for a description of addresses and responses.
- Page 9 Section 3 Command Summary. See Section 5— Commands for complete command descriptions. Until an SP=ALL command is executed, no changes will be stored in the PPT2 EEPROM. Re-apply the power or send an IN=RESET command to revert to the settings last saved in EEPROM.
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Page 10: Ppt2 Command Summary
October, 2016 3.0 PPT2 Command Summary The PPT2 command set is summarized in Table 1.0 – Command List. A more detailed description of each command can be found in the subsequent command descriptions in Section 5. Table heading explanations for Table 1.0 – Command List: Command Code: Two-character code (cc) in the command format (see Section 2.5). - Page 11 ADS-14221, PPT2 User Manual October, 2016 Write to EEPROM: Can this command have parameters stored in EEPROM? Yes – Parameter values associated with this command may be stored in EEPROM. No – Cannot store anything from this command in EEPROM.
- Page 12 ADS-14221, PPT2 User Manual October, 2016 Table 1.0 – Command List, Grouped by Function See previous page for descriptions of the table headings. Action Sequence of Requires Terminates Can Write Command Directing Response with Input or Write Continuous Can Write...
- Page 13 ADS-14221, PPT2 User Manual October, 2016 After (4) Both Lowest Analog Voltage (11) After (4) Both Offset Pressure Window (analog (11) output) After (4) Both Width of Analog Window (11) After (4) Both Send Number to DAC (force analog (11)
- Page 14 SP=ALL command. (10) The DA command does not write to the DAC but it does allow the DAC to be controlled by the PPT2 input pressure value or by a digital value applied by the N= command. (11) These commands only write to the DAC when used in the action directing form.
- Page 15 The ‘$’ is immediately followed by the normal command format. In the case of an RS-232 network, if an erroneous command is sent to the PPT2, it is echoed back to the host as soon as the PPT2 recognizes it as an invalid command.
- Page 16 PRESSURE READING DECIMAL POSITION The table below shows the number of decimal place variations with respect to PPT2 full scale - the number of digits to the right and left of the decimal place. This is valuable when converting a binary format number so that the proper decimal position can be determined.
- Page 17 ADS-14221, PPT2 User Manual October, 2016 PPT Commands/Parameters Not Implemented in PPT2 DA={O|S|T|U} Digital and Analog Control DO=N|P Noise Protection in P4 mode NE=ZER[O,V] NE Command Extension Reading Rate Speed Shift x2 Speed Shift at 50msec Intervals Synchronize Integration Cycles Temperature, Single, °F...
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Page 18: Terminology
Integration (I=) commands. PRESSURE READING CONTROL The PPT2 commands allow considerable flexibility in tailoring pressure acquisition times, reading windows, thresholds, and output rates. These are controlled by 4 commands: Deadband and Sensitivity (DS), Integration (I=), Idle Count (IC), and OPerating mode (OP). The user may control... - Page 19 The PPT2 provides three levels of addressing. The lowest level of address is the individual unit address, or device ID. This address level is used to address any single PPT2. The next level is group address, which is separate from the device ID. All PPT2 units with the same group address will respond to a command sent to this level address.
- Page 20 Those units having that group address read the command, then pass the command and reply to the next unit in the ring. Some responses pass the string of PPT2 replies before the group command while others pass the string of PPT2 replies after the group command.
- Page 21 89. A PPT2 multi-drop network connection of six units is shown below. In this network, the device IDs are not in order from one end of the network to the other. Looking at all the units on the bus, the device IDs are sequential beginning with ID=01 and without duplication.
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Page 22: Command Descriptions (Alphabetical Order)
The PPT stored a parity bit for each pair of ASCII characters stored in the 8 character A= register. This is not required for the PPT2. The PPT response is always 8 characters with trailing spaces if required. The PPT2 responds only with the characters stored. - Page 23 ADS-14221, PPT2 User Manual October, 2016 COMMAND CODE COMMAND DESCRIPTION Analog Range Setting Action Sequential Input or Requires Terminates Can Write to Can Write to DAC Directing Response Output Type Write Enable Continuous EEPROM with (90-99) Commands address Before Both...
- Page 24 EEPROM. The PPT also implemented parity with the B= contents. This will not be required for the PPT2. The PPT response is always 8 characters with trailing spaces if required. The PPT2 responds only with the characters stored.
- Page 25 NOTE: As shipped, the PPT2 is set to a baud rate of 9600, 1 start bit, 8 data bits, no parity, and 1 stop bit. If the baud rate has been changed to an unknown value, it will be necessary to search all the baud rate values to reestablish communication.
- Page 26 EEPROM. The PPT also implemented parity with the C= contents. This will not be required for the PPT2. The PPT response is always 8 characters with trailing spaces if required. The PPT2 responds only with the characters stored.