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Honeywell PPT2, User Manual

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Honeywell PPT2 User Manual Download Page 19

ADS-14221, PPT2 User Manual 

 

October, 2016 

 

 

18 of 85 

deadband limits. This controls the 

OP

 command mode’s sensitivity to pressure change when the 

‘output only when pressure changes’ (

OP=U

) option is selected.  

 

4.3 PPT2 

ADDRESSING

 

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. The last is a 

global address,

 which is read by 

all PPT2s on a network. The device ID can be assigned by direct command or assigned 
automatically based on its position from the host processor in PPT2 network. The 

null address

 (00) 

is simply a default device ID that the PPT2 automatically assumes until one is assigned. That is, 
upon power-up, if there is no ID assigned, and an ID has not been stored in the EEPROM, then the 
PPT2 will assign itself the “00” null address. 

 

The individual unit address, or 

device ID

, has an assigned range from 01-89. The null address 00 is 

the factory default address for unassigned PPT2s. A unit with the null address, replies with a ‘null 
address’ header. The null address header characters are ‘?’ for ASCII format (standard keyboard 
alphanumeric characters ) or ‘^, &, |, or %’ for binary format (fewer data bytes that are encoded for 
computer translation.) A unique device ID allows the host processor to send commands to specific 
units on a bus. 

 

The second level of addressing is a multicast, or 

group

, address in the range of 90-98. Each unit can 

be assigned a group address by the ID command. A unit responds to its group address in the same 
manner as it does to its global address described below. The group addressing allows the host 
processor to send commands to several units having the same group address. The factory default 
group address is 90. 

 

The highest level of addressing is the broadcast, or 

global

, address 99. All units receive global 

addressed commands. All RS-232 units respond to global commands. Only RS-485 units with as- 
signed addresses will respond to global commands. An RS-485 unit with a null address will not reply 
to any global command. Global addresses are not assigned but are built into the PPT2. 

 

 

 

Summary of Contents for PPT2

Page 1: ...ess mainly focus on the distribution of electronic components Line cards we deal with include Microchip ALPS ROHM Xilinx Pulse ON Everlight and Freescale Main products comprise IC Modules Potentiometer IC Socket Relay Connector Our parts cover such applications as commercial industrial and automotives areas We are looking forward to setting up business relationship with you and hope to provide you...

Page 2: ...Honeywell Precision Pressure Transducer 2 PPT2 User s Manual ...

Page 3: ...electronic or mechanical including photocopying and recording for any purpose without the express written permission of Honeywell Inc 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 conve...

Page 4: ...Terminology 17 5 0 Command Descriptions alphabetical order 21 6 0 Electrical Connections 75 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 85 ...

Page 5: ...en determining the accuracy allowance The PPT2 receives commands and sends digital data using either an RS 232 serial port or a multi drop RS 485 serial port of a computer Note many newer computers will have only USB ports no RS 232 or RS 485 ports A 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 configur...

Page 6: ...ed to the range and type of the PPT To operate the PPT2 in the analog output mode one additional item is needed Voltage Output A five digit voltmeter with 0 5 volt range connected between Analog Out and Signal Common A computer is not required to read the Analog output To operate the PPT2 in the digital output mode one additional item is needed A computer or host processor having an RS 232 or RS 4...

Page 7: ...tes a default address device called a null address This PPT2 has not yet been assigned an ID number by the user so it assumes the null address The PPT2___10__psid indicates a 10 psi differential device 2 5 COMMAND FORMAT Any command interaction with the PPT2 requires electrical connection to the RS 232 or RS 485 serial communications pins There are two basic types of commands action directing comm...

Page 8: ... coded into each PPT2 at the factory Refer to the ID command in Section 5 for a description of addresses and responses The CP 14 4582 indicates a compensated pressure of 14 4582 psi Your unit may not show this specific reading depending on the applied pressure it is measuring SET DEVICE ID To give the PPT2 an assigned address of 01 up to 89 enter the following commands 00WE cr This enables the PPT...

Page 9: ...re values between readings Each integration period gathers the data for one pressure reading output see Section 4 2 What is integration The range of integration times can be set by specifying readings per second I R50 for 50 readings sec or in 10 millisecond intervals I M600 for 6 seconds The factory set integration time is 200 milliseconds or 5 readings per second I M20 The output data rate can a...

Page 10: ...l Address Commands that begin with a group or global address ID 90 99 are passed through the PPT2 ring configuration network from one device to the next and eventually end up back at the host computer The PPT2 response is sent with the command through the network Before The PPT2 response is sent before the group or global command is repeated After The PPT2 response is sent after the group or globa...

Page 11: ...PROM Yes Parameter values associated with this command may be stored in EEPROM No Cannot store anything from this command in EEPROM All Cause all parameters to be stored in EEPROM Write to DAC Can this command be written to the DAC Yes Command may be directed to the DAC No Command is not associated with the DAC ...

Page 12: ...No No No Maximum Full Scale Pressure P No After 4 Out No No No No Production Date S No After 4 Out No No No No PPT2 serial number V No After 4 Out No No No No PPT2 Firmware Version Pressure Reading Modifiers I Yes After 4 Both Yes 6 No Yes 9 No Integration Time IC Yes Before Both Yes 6 No Yes 9 No Idle Count Parameter CM Yes Before Both Yes 6 No Yes 9 No Compatibility Mode new command DS Yes Befor...

Page 13: ...e and Parity Setting DA Yes Before Both Yes 6 No 12 Yes 9 Yes 10 Digital and Analog Control DO Yes Before Both Yes 6 No Yes 9 No Default Operating Parameters MO Yes Before Both Yes 6 No Yes 9 No Power up Mode OP Yes Before Both Yes 6 No Yes 9 No Operating Mode Parameters TO Yes Before Both Yes 6 No Yes 9 No Transceiver Operating Parameters Utility A No After 4 Both Yes No Yes 9 No Data string A B ...

Page 14: ...ually addressed the received command is rejected and the command read status error see RS command is set 5 These commands may cause sequential responses from any all or none of the addressed units A sequential response is when the PPT2 reply is sent before the global or group command through the network See the individual command descriptions for detailed information 6 These commands only require ...

Page 15: ...2 are not case sensitive i e either an upper case or lower case may be used Responses from the PPT2 will have capitalized command code characters Example 01CP 14 2426 equal sign required in some commands nnn additional characters required in some commands cr carriage return the ENTER key on a standard keyboard Note For RS 485 mode alternate headers are available see MO command In an RS 232 network...

Page 16: ...erted after 90 and 900 3 3 0 padded w leading spaces inserted after 9 and 90 2 4 0 padded w leading space inserted after 0 9 and 9 1 5 0 inserted after 0 09 and 0 9 1 6 0 or Leading zero replaced with 0 009 and 0 09 1 7 0 or Leading zero replaced with 0 0009 and 0 009 1 8 0 or Leading zero replaced with 0 0009 1 9 0 or Leading zero replaced with For differential units when determining decimal poin...

Page 17: ...O V NE Command Extension RR Reading Rate S2 Speed Shift x2 S5 Speed Shift at 50msec Intervals SI Synchronize Integration Cycles T3 Temperature Single F T4 Temperature Continuous F TO R M Special Ring and Multi drop protocol functionality TO C A S H Synchronization functionality TO N P Normal and Prompted RS 485 group global read operations Command Header for Binary DAC Values ...

Page 18: ...alues to create each pressure value The integration time can be set within a range of 1 to 1000 readings sec using the I Rn form or a range of 10 msec to 10 sec reading using the I Mn form The values for n range from 1 to 1000 for both the rate Rn form and the millisecond Mn form Second the integration cycles may be spaced with idle periods that cause pressure reading times to increase to as long ...

Page 19: ...nit address or device ID has an assigned range from 01 89 The null address 00 is the factory default address for unassigned PPT2s A unit with the null address replies with a null address header The null address header characters are for ASCII format standard keyboard alphanumeric characters or or for binary format fewer data bytes that are encoded for computer translation A unique device ID allows...

Page 20: ...IDs to every PPT2 on the network Since commands flow through every PPT2 on the ring a single 99ID 01 command will assign ID 01 to the first unit and each in the ring will assign itself the next number As the command is passed along each unit adds one to the ID command For the example network shown above the command will read 99ID 07 when it returns to the host processor The form of self addressing...

Page 21: ...removed without breaking the network connection The maximum number of addressable PPT2 s on a network is 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 This is an important setup ...

Page 22: ...ressure or temperature values or key pressure readings specific to application Default A empty NOTE EXAMPLES Inquiry ddA Action ddWE EEPROM Store ddWE ddA Your_msg ddSP ALL Your_msg must have 1 to 8 characters immediately following the character The message is terminated with the cr character The legal characters for Your_msg include all characters between the space SP and lower case z inclusive e...

Page 23: ...n 7 and 15 bits The use of analog window limits O and W can increase the volts pressure resolution of the analog signal Default AN ON NOTE Regardless of AN setting DX and DZ settings are always active AN command settings affect the analog output only when DA A B C D E F G M M R When DA V the analog output is disabled floating EXAMPLES Inquiry ddAN Action ddWE EEPROM Store ddWE ddAN ON OFF ON OFF d...

Page 24: ...pressure or temperature values or key pressure readings specific to application Default B empty NOTE EXAMPLES Inquiry ddB Action ddWE EEPROM Store ddWE ddB Your_msg ddSP ALL Your_msg must have 1 to 8 characters immediately following the character The message is terminated with the cr character The legal characters for Your_msg include all characters between the space SP and lower case z inclusive ...

Page 25: ...d rate and parity setting to be changed and the command to be retransmitted to the next PPT2 For multi drop networked RS 485 devices all units receive the command at the same time When the command transmission is complete the new baud rate and parity are activated but are not permanently stored in the EEPROM until an SP All command is executed A corresponding new communication port baud rate must ...

Page 26: ... specific to application Default C empty NOTE When MO M2 or M3 the contents of the C data string are used as the first 8 characters of the user startup message EXAMPLES Inquiry ddC Action ddWE EEPROM Store ddWE ddC Your_msg ddSP ALL Your_msg must have 1 to 8 characters immediately following the character The message is terminated with the cr character The legal characters for Your_msg include all ...

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