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Revision to Connecting thermistors or PT1000 temperature sensors

Tony

[code]M305 P1 X501 R4700 ; heater 1 uses a PT1000 connected to thermistor channel 1 which has a 4.7K series resistor[/code]
 
Note: '''PT1000 sensors connected to thermistor inputs have lower resolution than PT100 sensors connected via the RTD daughter board'''. The accuracy of PT1000 sensors should be very good on the Duet 2 Maestro and generally good on the Duet 2 Wifi and Duet Ethernet. However, it may be poor on the Duet 06, Duet 085 and other SAM3X8E-based electronics.
Note: '''PT1000 sensors connected to thermistor inputs have lower resolution than PT100 sensors connected via the RTD daughter board'''. The accuracy of PT1000 sensors should be very good on the Duet 2 Maestro and generally good on the Duet 2 Wifi and Duet Ethernet. However, it may be poor on the Duet 06, Duet 085 and other SAM3X8E-based electronics.
 
=== Note for users of Duet 0.6 boards and DueX4Duex 4 boards ===
=== Note for users of Duet 0.6 boards and DueX4Duex 4 boards ===
 
Early Duet 0.6 boards, and most or all Duet 0.6 boards sold by Replikeo, use 1K series resistors instead of 4.7K., Likewise, DueX4Duex 4 0.2 boards and earlier DueX4Duex 4 0.2a boards use 1K resistors. For these boards, use R1000 in the corresponding M305 commands instead of R4700.
Early Duet 0.6 boards, and most or all Duet 0.6 boards sold by Replikeo, use 1K series resistors instead of 4.7K., Likewise, DueX4Duex 4 0.2 boards and earlier DueX4Duex 4 0.2a boards use 1K resistors. For these boards, use R1000 in the corresponding M305 commands instead of R4700.
 
=== Correcting the temperature calibration of Duet 0.6 and 0.85. boards ===

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