Fisher & Paykel MR720, MR730, MR480, MR700 technical manual First Byte, Second Byte, Third Byte

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The data record as received should start with an ‘:’ and end with an ‘LF’. Under abnormal operating conditions however (when there are ‘E’ messages in the display) some or all of the above packets ‘a’ to ‘g’ can be missing. The status information packet ‘h’ will always be present (as long as the micro is running) and will show the error condition.

When there are error messages in the display, bit 6 of the last status byte will be set high indicating a fatal error condition.

First Byte

 

 

 

Bit0

Probe disconnect LED

 

 

 

Bit1

Heater Wire disconnect LED

 

 

 

Bit2

Airway Temp Low LED

 

 

 

Bit3

Airway Temp High LED

 

 

 

Bit4

Chamber Temp Low LED

 

 

 

Bit5

Chamber Temp High LED

 

 

 

Bit6

Chamber Temp Button LED

 

 

 

Bit7

Always set high

 

 

 

Second Byte

 

 

 

Bit0

Standby button LED

 

 

 

Bit1

Heater Wire operation LED

 

 

 

Bit2

Remote Shut Down request acknowledge

 

 

Bit3

Set Low LED

 

 

 

Bit4

Audio alarm muted

 

 

 

Bit5

External request acknowledge Heater Wire operation

 

Bit6

External request acknowledge No Heater Wire operation

 

Bit7

Always set high

 

 

 

Third Byte

 

 

 

Bit0

Heaterplate ON

 

 

 

Bit1

Heater Wire ON

 

 

 

Bit2

Always low

 

 

 

 

 

 

 

 

Bit3

Always low

Bit4

Bit5

Model

Bit4

See table

 

 

 

0

0

MR480

Bit5

See table

1

0

MR700

Bit6

Fatal error

0

1

MR720

Bit7

Always set high

1

1

MR730

 

 

 

 

 

A5.3 REMOTE STANDBY

A constant high input (pin 2 DB9 connector >1.5 V) shuts down the humidifier. Low or open circuit input enables the humidifier. An RSD request signal puts the humidifier into the standby mode; i.e. No low alarms active, controlled 40.0 °C heaterplate and 15% Heater Wire duty cycle. On removal of an RSD request the humidifier enters the warm up mode. On the MR730/720 models the standby LED is also turned on (not flashing).

Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001

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Contents D E L S MR730 MR720 MR700 MR480 Auckland, New ZealandRevision F changes Section Description of Change National OfficeContents Dual Probe Temperature Test Performance Check MR480Power PCB Harness Connection Diagram Maintenance Schedule B1.1Maintenance Schedule Checklist 10.1Appendix D MR700 Series General Specifications Models MR730/720/700EOH SETTOP RSDOperating Controls and Modes MR700 Series Humidifiers with Version 1.0 SoftwareStandby Button MR700/720/730 only 2 MR720 Version 2.0, 3.0 Software 1 MR700/MR730 ALL Software VERSIONS, MR720 Version 1.0 onlyAlarms and Indicators Version 1.0 and Version 2.0 Software Version 3.0 SoftwareAudio Alarm Circuit Operation Power Line Interrupt Revisions D/F Pcbs Revision H and J Pcbs Calibration For models with Revision D PCB and earlierPage Performance Check Alarms Check MR700/720/730 Dual Probe Temperature Test Replacing revision F or earlier power PCB MR700/720/730 Servicing InformationReplacing revision F or earlier power PCB MR480 Fault Location SCHEMATICS, Part Lists and Mechanical Drawings Power Board Control Board Component Layout Revision F PCB Page This page Left Blank Circuit Diagrams Revision H and J PCB Control PCB Circuit Diagrams Revision H and J PCB Power PCB Circuit Diagrams Revision F PCB Control PCB Circuit Diagrams Revision F PCB Power PCB DSP1, DSP2, DSP3 LED1, LED3LED2,LED4, LED5,LED11 LED6,LED7 LED8,LED9,LED10SW5 SPK1VR1 VR4Fuse fast acting 2 a 20 × 5 mm for 230 999830009 MR480AGM Exploded Diagrams MR480 10.3 MR730/720/700 Mechanical Parts MR720ASU Exploded Diagrams MR730/720/700 Heaterplate Assembly Parts MR730/720/700/480 Page PCB Identification Diagram Power PCB Harness Connection Diagram Product Change History Date Change First Serial Number Comments AffectedAAA Xxxxx Year Model Code Serial NumberAppendix a OFFError Messages A2.3 Integral DisplayEP1 EP2EP3 EP4Second Byte First ByteThird Byte A5.4 Serial Data Interface Connector B1 Maintenance Schedule Appendix BPhotocopy and File in Maintenance Records Electrical Safety Checks as requiredAppendix C Possible cause Action to takeHigh Temperature C1.5 C1.6LED on Check Voltage Rating Of Unit Cleaning instructions Appendix DSetup Notes Appendix EDynamic Test Sequence MR730/720/700 Dynamic Test Procedure MR480