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Instruction Manual

MX4A Active Convection Gauge

Figure 4: Graph of Analog Output Functions Available on the MX4A

3

RS-485 Communications

This gauge communicates with the host computer through an RS-485 interface. Each communica-
tion correspondence consists of a command line sent by the host computer and a response from the
gauge.

To communicate with the MX4A via RS-485, the user must have an RS-485 capable device to send
commands to the MX4A. Each command must be preceded by a * and will be an S, R, W, RC, or WC.
See the Communications Specifications heading for information on what settings are necessary to
properly communicate with the MX4A.

3.1

Changing Communications Settings

The communication parameters, (baud rate, address, etc.), are changed through the local menu.
Please see the section in this manual entitled Explanation of Menu Items and Navigation for more
information on navigating and editing within the menu. Below are provided some specifics on the
RS-485 Communications of the MX4A.

email: [email protected]

tel: +1 215 947 2500

web: frederickscompany.com

mx4a_im rev L

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Содержание MX4A

Страница 1: ...4A Active Convection Gauge Instruction Manual The Fredericks Company Televac 2400 Philmont Avenue Huntingdon Valley PA 19006 web www frederickscompany com email sales frederickscompany com tel 1 215 947 2500 fax 1 215 947 7464 ...

Страница 2: ...mmunications Settings 13 3 2 Communications Specifications 14 3 3 RS 485 Command List 14 3 4 RS 485 Sample Commands 15 3 5 RS 485 Error Codes 16 List of Tables 1 Operating Specifications 3 2 RS 485 Communication Specifications 14 3 RS 485 Commands 14 4 RS 485 Command Examples 15 5 Understanding the Sample Commands ppse PPSE and Baaa 16 6 Examples for ppse PPSE and Baaa 16 7 Error Code Explanations...

Страница 3: ... 1 10 4 Torr to 1000 Torr It utilizes a Televac convection vacuum sensor part number 2 2120 0YY It has a two color OLED display with selectable units of Torr Millibar and Kilopascal Settings can be changed through RS 485 communications with a PC or on the unit using four capacitive touch buttons located on the top of the unit The MX4A has 2 set points one relay and one open collector and a selecta...

Страница 4: ...h exponent Analog Output Resolution 16 bits Operating Temperature 0 C to 50 C Storage Temperature 20 C to 60 C Bakeout Temperature Brass P N 2 8930 110 100 C electronics removed Stainless P N All Others 200 C electronics removed Response Time 1 second Accuracy 1 mTorr to 10 mTorr 1 mTorr 10 mTorr to 1000 Torr 10 Analog Output 5 mV Standard Resolution 1 mTorr to 500 mTorr 1 mTorr 500 mTorr to 5 Tor...

Страница 5: ...safety precautions must be observed during all phases of operation installation and service of this product Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Televac disclaims all liability for the customer s failure to comply with these requirements READ Instructions Read a...

Страница 6: ...nsor Connect the power connector to the top of the unit and be sure to tighten the screws so that a firm connection is maintained Try to avoid connecting the MX4A to the vacuum chamber by long or narrow piping as this may affect the accuracy and response time of the unit Avoid mounting the unit near a heater within the chamber as this may affect the measurement accuracy Excessive vibration of the ...

Страница 7: ...es in addition to toggling between options where appropriate Using the UP and DOWN arrows allows navigation through menu options The UP and DOWN arrow buttons are also used to edit values 2 4 Menu Structure 1 Measurement 2 Calibration a Vacuum b 1 Torr c 70 Torr d Atmosphere e Resolution High Low f Default g Diagnostic h Analog Output Adjustment i Gas Type 3 Set Points a SP1L b SP1H c SP2L d SP2H ...

Страница 8: ...e performed in the following order vacuum adjustment 1 Torr ad justment 70 Torr adjustment 760 Torr adjustment Failing to calibrate in this order will result in inaccuracies Note 2 CHANGING CALIBRATION SETTINGS VOIDS NIST TRACEABLE CALIBRATIONS A Vacuum Zero To reach the vacuum screen The vacuum screen is the first pane of the calibration screen Press ENT to unlock the vacuum screen Press UP or DO...

Страница 9: ...d press ENT to save and lock the change The atmosphere calibration point allows the gauge to adjust the pressure reading at atmosphere 760 Torr This should be used only when the operator knows that the unit is exposed to at mosphere or is compared to a reference gauge that is NIST calibrated and reading near 760 Torr For users calibrating against a NIST calibrated standard maximum accuracy for the...

Страница 10: ...res or in significant humidity the agreement may change slightly For uses of the MX4A where the analog output accuracy is critical an adjustment is available to ensure accuracy When making this adjustment use a calibrated voltmeter to measure the analog output voltage when the MX4A is at a very stable pressure Compare this voltage reading to the expected voltage The expected voltage can be determi...

Страница 11: ...N to change the value When the desired reading is reached press ENT to save and lock the change The MX4A contains two set points for the convenience of the operator Set point 1 is an N Channel 60 V MOSFET open collector It has a maximum current rating of 1 A The data sheet can be found at www vishay com docs 69958 si2308bd pdf Set point 2 is a relay with a maximum switching voltage of 220 V DC 250...

Страница 12: ...Navigate to the analog output screen Press ENT to unlock the screen Press UP or DOWN to set the desired output type When the desired analog output is reached press ENT to save and lock the change The types of analog output are listed below For more information on the types of output please see the heading in this manual labeled Analog Output a Logarithmic b Linear by Decade c Non linear d Linear 4...

Страница 13: ...ple a voltage reading of 8 367 Volts corresponds to a pressure of 36 7 Torr 108 6 367 36 7 Torr C Non linear The Non linear option outputs the raw signal collected by the 4A sensor The raw signal is converted to the pressure using a many point linearization process done by the MX4A This feature is used for diagnostic purposes D Linear 4 The Linear 4 output is one of four linear outputs that cover ...

Страница 14: ...ach command must be preceded by a and will be an S R W RC or WC See the Communications Specifications heading for information on what settings are necessary to properly communicate with the MX4A 3 1 Changing Communications Settings The communication parameters baud rate address etc are changed through the local menu Please see the section in this manual entitled Explanation of Menu Items and Navig...

Страница 15: ...ansfer Distance Max 100 meters 3 3 RS 485 Command List Table 3 RS 485 Commands Command Description R1 Read units R2 Read SP1L and SP1H R3 Read SP2L and SP2H W1 Set pressure units W2 Set SP1L SP1H W3 Set SP2L SP2H W4 Set gas type S1 Read pressure data RC1 Read vacuum adjustment RC2 Read 1 Torr adjustment RC3 Read 70 Torr adjustment RC4 Read atmosphere adjustment WC1 Write vacuum adjustment WC2 Writ...

Страница 16: ... lower to ppse and Assign set point 1 upper to PPSE 0W2ppsePPSE CR ppsePPSE Assign set point 2 lower to ppse and Assign set point 2 upper to PPSE 0W4xx CR GG Change gas type N2 Nitrogen Air AR Argon 0S1 CR ppse Vacuum reading is ppse 0RC1 CR Baaa Read Vac Adjustment 0RC2 CR Baaa Read 1 Torr Adjustment 0RC3 CR Baaa Read 70 Torr Adjustment 0RC4 CR Baaa Read Atm Adjustment 0WC1Baaa CR PPSE Vac Adjust...

Страница 17: ... 2412 Pressure 2 4 102 ppse 8703 Pressure 8 7 10 3 PPSE 3402 Pressure 3 4 10 2 PPSE 5211 Pressure 5 2 101 Baaa 0249 Adjustment 249 Baaa 1382 Adjustment 382 3 5 RS 485 Error Codes Table 7 Error Code Explanations Error Code Description 0N001 Command error invalid character command or number after character 0N002 Units error invalid number received after 0W1 0N003 Set point value error invalid or out...

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