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Honeywell PPT User Manual

Honeywell PPT User Manual

Precision pressure transducers
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Honeywell Precision Pressure Transducers
PPT and PPTR User's Manual

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  • Page 1 Honeywell Precision Pressure Transducers PPT and PPTR User’s Manual...
  • Page 2 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.

  • Page 3: Table Of Contents

    Pressure Reading Control ................14 Output Voltage Control ................... 16 Pressure Window Control ................16 Customized Pressure Range ................17 Setting Pressure Set Points ................18 PPT Analog Output Configurations ............... 19 Command Illustrations ................... 20 4.10 Pressure Reading Decimal Position ............... 24 4.11...
  • Page 4 PPT User’s Manual Contents (cont’d) 5 COMMANDS ......................28 Command Format ................... 28 Information Request Commands ..............29 Action Directing Commands ................29 Command Replies—General ................29 ASCII Format Replies ..................30 Binary Format Replies ................... 31 Command And Reply Sequencing ..............34 Command Errors .....................
  • Page 5 Deadband on Set Point ..................18 Figure 4.9 Figure 4.10 PPT Pressure to Analog Voltage ..............19 Figure 4.11 PPT Pressure Readings and Analog Voltage Control ........19 Sensing Remote Analog Pressure ..............19 Figure 4.12 Integration (I=) Command, Example 1 ............20 Figure 4.13 Integration (I=) Command, Example 2 ............
  • Page 6 Tables Table 1.1 Various Digital and Analog Output Modes ............2 Table 4.1 PPT to PPT Remote Sensing Setup Commands ..........20 Table 4.2 Decimal Place Locations for Pressure Readings ..........24 Table 5.1 Header Description for Binary Format Pressure Readings ......31 Table 5.2...

  • Page 7: User Manual Content

    This user’s manual is divided into the following sections. Section 1 Introduction—Product overview and hardware description. Section 2 Getting Started—Lists equipment and procedures necessary to operate the PPT and provides a few simple command examples, which will get first-time users acquainted with the command structure. Section 3 Commands: Quick Reference—A brief description of each command with...

  • Page 8: Introduction

    The PPT receives commands and sends data from either a RS-232 port or a multidrop RS-485 port. Using the RS-232 type PPT, up to 89 units can be connected in a ring configuration to a single serial port of a computer. The RS-485 type PPT allows up to 89 PPTs to be connected to a two-wire multidrop bus, when bus repeaters are used to satisfy the RS-485 bus electrical requirements.

  • Page 9: Getting Started

    • Turn the local echo ON. When shipped from the factory, the PPT is set to a baud rate of 9600, 1 start bit, 8 data bits with no parity and one 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 10: Initial Turn-On Response

    RS-485 ?00PPT____10__psid The “?01” or “?00” indicates a default address device called a “null address”. This PPT has not yet been assigned an ID number so it assumes the null address. The “PPT____10__psid ” indicates a 10 psi differential device.

  • Page 11: Step-By-Step Examples

    Note: The “?” indicates a response from a null address PPT – one which has not been assigned a device ID. A null address, 00, is coded into each PPT at the factory. When a RS-232 null address PPT responds, it adds one to its address, hence, the response ‘01’.
  • Page 12 CHANGE TO A NEW SAMPLE RATE Enter the following command: Type: *01WE <cr> This enables the PPT RAM to accept a changed parameter. Type: *01I=M20<cr> This sets the integration time to value 20, which corresponds to an output sample every 2 seconds.

  • Page 13: Command Functional Groups

    COMMAND FUNCTIONAL GROUPS PRESSURE DISPLAY UNITS PPT reads out psi, in wc, mm Hg, etc. Set pressure units for output readings—any one of 13 common units Specify a user supplied unit of measure TEMPERATURE Single °C Continuous °C Single °F Continuous °F...
  • Page 14 START-UP PARAMETERS—Sets the PPT configuration after power is applied Enable parameter writes to the RAM or EEPROM Store RAM parameters to the EEPROM for startup Specify the power-up message and operating mode PRESSURE NOISE REDUCTION—Reduces pressure noise signals Set deadband and sensitivity parameters...

  • Page 15: Commandsquick Reference

    COMMANDSQUICK REFERENCE Example Example Input (1) Response (2) Analog Range Setting Turn analog customization on *01WE *01AN=ON Inquiry *01AN #01AN=ON Data String A Write string A *00WE (up to 8 characters, a <cr> indicates end-of- *00A=2-8-95 message. More than 8 characters is an invalid write) (Can store info.
  • Page 16 *00NE (example to set output of DAC to 2.5Volts) *00N=2500 Set continuous PPT DAC parameters *01NE=DAC (set the PPT#01 DAC output to 2.5Volts) *01N=2500 (set the PPT#01 DAC output to 1.25Volts) *01N=1250 (set the PPT#01 DAC output to 0.1Volts) *01N=100...
  • Page 17 Input (1) Response (2) Operating Mode Parameters Set OP parameter *00WE (set to extended binary output mode) *00OP=E Inquiry *00OP ?01OP=ANEW Pressure, Single, ASCII Format Request compensated pressure *00P1 ?01CP= 14.450 Pressure, Continuous, ASCII Format ?01CP= 14.450 Request compensated pressure *00P2 (repeated) Pressure, Single, Binary Format...
  • Page 18 *12.. instead of *00... (2) The responses shown here begin with ?01.. and are for a null address PPT. That is, a PPT that has not yet established unit identification (see ID command). If the PPT has an assigned address of 23, for instance, the response will begin with #23..

  • Page 19: Functional Operation

    In addition, a temperature compensated analog output is available. Analog output parameters can be modified by the user when the PPT digital communications port is connected to a computer, or host processor. For example, the factory set range of 0 to 5 VDC for the analog output voltage can be modified to 1 to 5 VDC operation or any voltage span within the 0 to 5 volt range in 1% increments.

  • Page 20: What Is Integration

    (SI), Idle Count (IC), and Integration (I=) commands. PRESSURE READING CONTROL The PPT commands allow considerable flexibility in tailoring pressure acquisition times, sample windows, thresholds, and output rates. These are controlled by 7 commands: Deadband and Sensitiv- ity (DS), Integration (I=), Speed shift (S2), Speed shift at 50msec intervals (S5), Idle Count (IC), Reading Rate (RR), and OPerating mode (OP).

  • Page 21: Figure 4.2 Pressure Reading Control

    Figure 4.2—Pressure Reading Control Shaded blocks represent command codes executed in the microprocessor...

  • Page 22: Output Voltage Control

    If the analog measuring device in the application has a low level input limit of 1 volt and a high limit of 4.85V, the PPT can be configured to accommodate this. The lower limit can be set to any value between 0 and 5 volts in 50 millivolt increments (1% FS steps).

  • Page 23: Customized Pressure Range

    Using the store parameters command (SP), the configuration changes can be saved in EEPROM so that the PPT will power up in that state ready to operate. This is particularly useful for applications that use the analog output signal. The PPT can be configured and stored in the lab and used in the field as an analog only instrument.

  • Page 24: Setting Pressure Set Points

    PPT. The F= command allows the user to reduce the full scale range of the PPT as much as one-half the factory FS value. The F= command value can have up to 5 significant digits with a decimal point. Enter an F=0 command to disable this function and return to the factory default (M=) full scale value.

  • Page 25: Ppt Analog Output Configurations

    The PPT is truly a smart sensor device, but it can also be used to replace conventional analog pres- sure sensors straight from the box. A benefit of using the PPT in the analog mode is that there is no need for offset or span adjustments to achieve the specified accuracy across a -40 to 85°C (-40 to...

  • Page 26: Command Illustrations

    This can easily be accomplished using two PPT units, one at the pressure point and one by the chart recorder. A two-wire digital interface would transmit PPT1 pressure information to the PPT2 re- corder point. The digital RS-232, or RS-485, line is more tolerant of noisy environments and connec- tor losses than an anaolg signal.

  • Page 27: Figure 4.15 S2 Speed Shift Command Example

    (S2, S5) allow the tracking of rapid changes while sampling less often when pressures are slowly changing. A threshold is set independently for the S2 and S5 commands that tell the PPT when to begin outputting samples at the higher rate. The S2 command causes the output rate to double. The S5 command causes the readings to be output at 50 msec intervals synchronous with the normal reading rates.

  • Page 28: Figure 4.16 S5 Speed Shift Command Example

    The IC command does nothing more than skip over a set number of readings. If the idle count were set to IC=4, then after a pressure output reading, the PPT would not output the next 4 readings and the fifth one would become the next output reading. This feature allows the reading rate to be estab- lished different from the integration time.

  • Page 29: Figure 4.18 Idle Count (Ic) Command Example

    ±40 x 0.005% FS = ±0.20%FS. 5.00 Then setting DS=S1 selects the spread deadband option with a 10x multiplier. 4.00 PPT pressure output For a 20 psi full scale device, this results 3.00 Actual pressure in a ±0.40 psi deadband window.

  • Page 30: 4.10 Pressure Reading Decimal Position

    Digital pressure readings are displayed with a sign and a decimal position. Table 4.2 shows the number of decimal place variations among the PPT pressure ranges; the number of digits to the right of the decimal place. This is valuable when converting a binary format number so that decimal position can be determined.

  • Page 31: Ppt Addressing

    ID that the PPT 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 PPT will assign itself the “00” null address.

  • Page 32: Figure 4.21 Rs-485 Ppt Multidrop Network

    Each PPT on a communication ring must have a unique address in order to individually receive commands from the host processor. For example, if more than one PPT on a ring has a null address, and a 00 address command is transmitted by the host, only the first null address PPT will receive the command and the command is not passed on.
  • Page 33 *02SP=ALL. Now when a command is sent to group 91, device ID=02 will be the first one to reply. In Figure 4.21, there are two address groups, 91 and 93; each have 3 PPT units assigned. Every PPT in the network receives all commands. If the command has a group or global address requiring a response, the PPTs addressed will wait until the unit with the next lower address responds before sending its response.
  • Page 34 Also for RS-232 mode, if an erroneous command is sent to the PPT, it is echoed back to the host in the same form it was sent. The only exception to this is when a group or global address command (ID = 90 to 99) is sent such as *99S2=15<cr>.

  • Page 35: Information Request Commands

    8 bytes. When an information request command is sent to a PPT or group of PPTs the reply will take on different forms based on the state of the PPT, the address of the PPT, or the out-of-range condition...

  • Page 36: Ascii Format Replies

    (pressure reading will output zero). ?ddcc=.. reply from a null address unit (dd) when data is not available yet from the PPT or the output was disabled (see DA command). Request again. Note: For multidrop bus mode alternate header descriptions see...

  • Page 37: Binary Format Replies

    Right brace At/each & And/ampersand Percent Dollar sign (used before a command to stop, or suspend, continuous PPT trans- missions while manually typing commands) Space, or Blank ‘ ‘ BINARY FORMAT REPLIES The binary format reply is only used for the pressure reading commands P3 and P4. It consists of a 1 byte header character, 4 bytes data, an optional 1 byte cyclic check sum, and 1 byte <cr>...

  • Page 38: Figure

    Note: A PPT can be configured (using DA=O, S, T, or U) to provide a ‘~’ response to a P3 or P4 request. In this case, the header is a ‘~’, the address is the group address, no error conditions are indicated and the sign is always positive.

  • Page 39: Table 5.2 Binary Format Character Codes

    Binary Binary Decimal Least 6 Decimal Least 6 Format Format Character Value Value Binary Value Significant Bits Character Value Value Binary Value Significant Bits 0100 0000 000000 ‘ 0110 0000 100000 0100 0001 000001 0010 0001 100001 0100 0010 000010 "...

  • Page 40: Command And Reply Sequencing

    COMMAND AND REPLY SEQUENCING When the PPT is operated in the digital output mode, it may be connected to a host processor, or com- puter, via RS-232, or RS-485, connection. See Section 6 for various electrical connections. In this mode, the host processor sends a command and the PPT responds with a reply.

  • Page 41: Command Errors

    Figure 5.2—Multiple PPT Network Command and Replies COMMAND ERRORS For RS-232 ring configuration, if the host processor receives a PPT reply with a ‘*’ header character, this indicates one of three conditions. If the reply is exactly the same as the command sent, and the command was not sent to a group or global address (90 to 99), then the command has been rejected due to an incorrect header, address number, command code or action character.

  • Page 42: Command Summary Table

    COMMAND SUMMARY TABLE The PPT command set is summarized in Table 5.3—Command List. A more detailed description of each command can be found in Section 5.10—Command Descriptions. Table heading explanations for Table 5.3—Command List: Command Code: Two-character code (cc) in the command format. The command code characters can be one letter followed by an ‘=’...

  • Page 43: Table 5.3 Command List

    Both Yes (6) No (11) Set idle count (data output rate) Before Both Yes (6) No (11) Set PPT device ID or group number No (2) Initialize or reset PPT processor After (4) Both Yes (6) No (11) Yes (13)

  • Page 44: Figure

    PPTs. Also, these commands require more time for execution, often requiring EEPROM reads and/or writes, so responses from more than one PPT are not received in any guaranteed order. During the execution of one of these commands, if another command is received that is an “After”...

  • Page 45: Command Descriptions

    The command code characters may be one letter, two letters, or a letter and a number. The letters are not case sensitive; i.e. either upper case or lower case may be used. The PPT will convert the character to upper case.
  • Page 46 <cr> (ENTER key) character. The data string is automatically stored in EEPROM with this action command. Since this string is stored in EEPROM, it will remain in the PPT even after the power is turned off. Examples include dates for maintenance checks, over/under range pressure or temperature values, or key pressure readings specific to application.
  • Page 47 SP=ALL command. (Default: BP=N9600) Note: When shipped from the factory, the PPT 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 48 <cr> (ENTER key) character. The data string is automatically stored in EEPROM with this action command. Since this string is stored in EEPROM, it will remain in the PPT even after the power is turned off. Examples include dates for maintenance checks, over/under range pressure or temperature values, or key pressure readings specific to application.
  • Page 49 EEPROM with this action command. Since this string is stored in EEPROM, it will remain in the PPT even after the power is turned off. Examples include dates for maintenance checks, over/under range pressure or temperature values, or key pressure readings specific to application. If the re- sponse has an ‘!’...
  • Page 50 (4) Analog output will track the ‘~’ DAC value inputs only if they are “down stream” from the transmitting PPT with the same group address, or the analog output tracks the ‘~’ or N= values transmitted by a control processor (5) These selections may cause PPT microprocessor bandwidth warnings, RS=xxxB, when used with pressure reading rates over 100/sec (see I= Rn) dependent on the baud rate selected.
  • Page 51 RS-232 configuration only A decimal number from 0 to 9. The number 0 should be used if a single PPT is connected. When 2 or more PPTs are on the bus, the correct number is calculated by dividing the number of PPTs by 10 and rounding up to the next whole number.
  • Page 52 Deadband and Sensitivity Control The Deadband and Sensitivity control command allows the user to adjust the threshold value that causes a change in pressure reading. There are two option for this, C and S. The C option sets the deadband to around the center of the pressure reading that moved it last. When the deadband is first set, the deadband will be split half above and half below the current reading.

  • Page 53: Table 5.5 Display Units Options

    Display Units Control Set the Display Units for compensated pressure replies. A USER defined display unit can be set with this command that causes the pressure output to equal the value input by the U= command multi- plied by the actual pressure in psi units. (Default: DU=PSI) Inquiry: *dd DU...
  • Page 54 PPT. The F= command allows the user to reduce the full scale range of the PPT by at least one-half the FS value (M=). Some units may allow more than 2x reduction of the full scale value. The F= command value can have up to 5 significant digits with a decimal point.
  • Page 55 Integration Time (I=) command. (See the I= command for setting integration times.) This parameter can be used to reduce the average PPT power requirement by as much as 50% when increased response time is acceptable. This parameter is also used to reduce the reply message traffic on the network bus from PPTs whose response time is not critical.
  • Page 56 RS-232 type only To unassign all device IDs, send a *99WE and a *99ID=00 command. In this case, all the PPT units in the network will set their device IDs to address ‘00’, the null address. To sequentially assign device IDs to a RS-232 ring network, send a *99ID=01 to the first unit. That...
  • Page 57 If group addressing is to be used for PPT responses, then all PPT’s within a single group must have a group sub-addresses assigned sequentially starting with address 01. The command sequence to assign group address 91 and sub-address 01 to a PPT with identification address 03 is:...
  • Page 58 An L= inquiry reads the value in 50 millivolt counts. This command is used in conjunction with the H=, and AN commands to customize the range of the PPT analog voltage output –see Figure 4.4. If there is an input error, then the command error flag in the RS command will be set and no change will occur.
  • Page 59 Power-Up Mode Sets the power-up MOde for the PPT. This command does not produce any immediate operational change but, when stored in the EEPROM with the SP command, causes the specified option(s) to be applied at power-up, at an IN=RESET command, or a watchdog timer timeout (if activated). (De-...
  • Page 60 Send Number to DAC The analog Number command is used to apply an ASCII decimal format value to the DAC for direct host processor control of the analog output. Before executing this command the digital and analog control must be set to DA=G, N, or R and the analog write enable must be activated - *ddNE, or *ddNE=DAC.
  • Page 61 (F= value). This command is used with the W=, L=, and H= com- mands to customize the size of the PPT analog output window and analog output voltage. This command has no effect on the digital readings. This command is enabled by the AN command. If there is an input error, then the command error flag in the RS command will be set and no change will occur.
  • Page 62 Note: See DS command for controlling the amount of pressure deviation that is detected as a change. See RR command to skip identical readings. Upon receipt of a P2 or P4 command, the PPT will send one reading and then wait for a pressure change before sending another.
  • Page 63 Production Date The Production date command reads the factory set PPT manufactured date with format mm/dd/yy. If the response has an ‘!’ character instead of ‘=‘, there was an EEPROM parity error. Inquiry: *ddP= Pressure, Single, ASCII Format The P1 command requests a temperature compensated pressure (CP) reading in ASCII format. Refer to Table 4.2 for default decimal placement and significant digits.
  • Page 64 Inquiry: *ddP4 Type: $*ddIN or *ddIN To stop a single PPT from continuous pressure reading. Type: $*99IN or *99IN To stop the continuous readings for all PPTs on the bus. Note: For RS-485 units, when the continuous transmit parameter is NOT active (is not set to TO=C), the P4 command sends only one reading.
  • Page 65 Reading Rate The Reading Rate command specifies the number of identical readings to skip after a pressure reading has been transmitted before making another reading available. The TO=C command option must be set. The sensitivity to pressure changes and deadband is controlled by the DS command. (Default: RR=0) Note: This command is only operational when OP=U is used.
  • Page 66 The Read Status command is used to determine if an error, or warning, condition has been detected by the PPT. The act of reading the RS command clears the error, or warning, indicators, except for EEPROM checksum errors, which require two RS commands to clear.
  • Page 67 The maximum pressure reading is 105 percent of FS. This limit varies slightly from device to device but will continue to display the out-of-range indicator (“!” in place of “=“) until the pressure drops below 101 percent of FS Note: In the unlikely event of EEPROM checksum errors, the temperature and pressure integra- tion cycles stop.
  • Page 68 The address assignment is then performed by a *99IDnn com- mand, where nn is the address. Note: If two PPT units on a RS-485 bus have the same ID then you can use the sequence below to re-assign ID numbers...
  • Page 69 When the pressure change rate falls below the threshold, the PPT resumes transmission at its configured output rate. This command is only operational when the I=Mn form of the Integration command is used. See Figure 4.15 for command illustration. (Default:...
  • Page 70 The Tare command allows the user to input a tare (zero offset) value, and is applicable only to gauge PPT types. This command has two forms. 1) Use the currently applied pressure to zero the PPT (SET), or 2) The user may supply a zero set point value (TareValue) in terms of a %FS pressure range.
  • Page 71 A group or global address command echo of *9dT1! indicates that RS-232 buffer space was not available for one or more of the addressed PPTs. Note: The PPT continuously integrates and calculates pressure and temperature readings. When this command is received, the latest available reading is transmitted if there is sufficient output buffer space.
  • Page 72 The Tare Control command turns on or off the user controlled tare (zero offset) function. When ON, the setting established by the T= command is used to set the zero reading of the PPT. When OFF, the factory supplied zero setting is used. (Default:...
  • Page 73 Transceiver Operating Parameters Sets the Transceiver Operating parameters for the RS-232, or RS-485, transceiver interface proto- col. The TO=R or M commands can select either a ring or multidrop configuration for RS-232 type PPTs, or a multidrop configuration only for RS-485 type PPTs. All other command parameters apply only to the multidrop RS-485 configuration.
  • Page 74 User Supplied Display Units The User supplied display units command allows the user to enter units of measure for the PPT. The value entered for this command is multiplied by the actual pressure in psi to get the user defined units.
  • Page 75 (F= value). This command is used with the O=, L=, and H= commands to customize the size of the PPT analog pressure window and analog output voltage. If there is an input error, then the command error flag in the RS command will be set and no change will occur. This com- mand is enabled by the AN command.
  • Page 76 The Write Enable command enables an EEPROM write or a RAM write operation. It is used as a safeguard to prevent erroneous command sequences from changing the PPT configuration. A *ddWE command must immediately precede the SP, A=, B=, C= or D= commands when storing information in the EEPROM.
  • Page 77 Slope 2—User Compensation Control The user can adjust the pressure vs. output curve using the X=, Y=, and Z= commands. The Y= command adjusts the slope of the pressure output curve for negative pressures. This modifies the negative full scale slope. The range of adjustment is ±0.6%FS in 0.005% increments. Use the modi- fied full scale value if the F= command is set.
  • Page 78 Execute the following commands: *ddWE *ddZ=REF 3) To complete the above offset correction sequence, orient the PPT-R in the application S E T mount orientation. Note if the pressure reading has changed and if so, execute the follow- ing commands;...
  • Page 79 Therefore, the command ~@jXD<cr> will set the DAC output to 4.2500 volts when DA=G, N, or R and the NE=DAC is enabled. Note: The PPT transmits ‘~’ command data when DA=O, S, T, or U and a P3 or P4 is activated. The address of the transmitted ‘~’ command is the group address of the PPT.

  • Page 80: Electrical Connections

    Newark Stock no. 89F4115 PPT and PPTR, Metal Mating Connector ITT Cannon P/N MS3116F10-6S Newark Stock no. 93F3377 Figure 6.1 PPT - Plastic, PPT - Metal and PPTR Electrical Connector Pin Assignments Figure 6.2—Connection for RS-232 Operation and Analog Output...

  • Page 81: Figure 6.3 Connection For Rs-485 Operation And Analog Output

    Power and Signal Common DC Power 5.5 to 30 V DC Power In Make all common connections at this end of the cable. Voltage Output Actuator or Valve ection for Computer Operation Figure 6.5—PPT Conn and User Controlled Analog Voltage Output...

  • Page 82: Timing Diagrams

    TIMING DIAGRAMS For the factory default settings, the PPT will respond to a P1 or P3 pressure reading with an integration time of 200 msec at 9600 baud data output. The timing for this is shown Figure 7.1. The RS-232 com- mand input time, Y, is the transmission time for the command message.

  • Page 83: Figure 7.4 Timing Diagram For 20 Readings Per Second

    . . . Integration period 50 msec 50 msec 50 msec . . . Calculations 10 msec (nom.) . . . RS-232 Pressure Reading Output X msec 16.7 msec 50 msec (Integration Time = 50 msec, I=R20) (See Tables 7.1 and 7.2 for X times) Figure 7.4—Timing Diagram for 20 Readings Per Second When I=R31 (or more) mode: .

  • Page 84: Table 7.1 Transmission Times At Selected Baud Rate

    Baud Rate (bps) Time/Character (msec) 1200 8.33 4.17 2400 2.08 4800 1.04 9600 14400 0.694 0.521 19200 0.347 28800 (1) Time is same for No, Even, or Odd parity selection Table 7.1—Transmission Times at Selected Baud Rate Reply from: # of Characters F o r m a t P3, P4 no checksum Binary...

  • Page 85: Specifications

    SPECIFICATIONS...
  • Page 86 • Digital Output: (RS-232 or RS-485 ) Baud Rates: 1200, 2400, 4800, 9600, 14400, 19200, 28800 Data Framing: 1 start bit, 8 data bits, 1 stop bit Parity: No parity, even parity or odd parity Handshaking: Not supported Addressing: 89 individual (self numbering, or user assigned) 9 group addresses (multicast) 1 global address (broadcast) 1 null address (address not assigned)

  • Page 87: Dimensions

    PPT (Metal Signal Name (Plastic Connector), Connector) PPTR RS-232 (TD) or RS-485 (B) RS-232 (RD) or RS-485 (A) Case Ground Common Ground (GND) DC Power In (+) Voltage Output Figure 9.1 – PPT Case Outline Figure 9.2 – Electrical Connector...

  • Page 88: Table 9.1 Ascii Conversion Table

    DEC HEX ASCII DEC HEX ASCII DEC HEX ASCII HEX ASCII ctrl @ ’ ctrl A ctrl B “ ctrl C ctrl D ctrl E ctrl F & ctrl G ’ ctrl H ctrl I ctrl J ctrl K ctrl L <cr>...
  • Page 89 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.
  • Page 90 Honeywell Aerospace 12001 State Highway 55 Plymouth, MN 55441 www.honeywell.com...

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