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→J-16 Data, Status and Telemetry
*Keeping the digital +5 V / +12 V supply on its own winding (blue) isolates digital switching noise from the ±15 V analog rails, which carry the precision references for the AD7543 DAC and the AD654 V/F converters.
=== J-16 Data, Status and Telemetry ===
[[File:BIO-RAD OEM NO 127B Conn J16.jpg|none|thumb]]
J-16 carries four data lines to an on-board [https://wiki.recessim.com/w/images/f/fc/AD7543.PDF AD7543] Digital to Analog Converter (DAC) which selects the voltage generated by the power supply. 0 - 4095 is the valid range to set ~20V to 3000V in 0.7V increments. It also has PWM outputs for voltage and current to monitor actual values and three additional I/O lines to signal Circuit Open, Circuit Shorted and one Circuit Unknown, possibly to signal a ground fault condition per the user manual. This connector goes straight to optocouplers so the control side is isolated from the high voltage side.{| class="wikitable"|+J-16 Pinout!Position!Function!Direction!To IC pin!Notes|-|1| +5V|Input|PC1-1,3,5,7|Supplied by the logic board to the Optocoupler drivers used to send data to the DAC|-|2|Voltage PWM|Output|PC2-16|PWM output corresponding to voltage level|-|3|Current PWM|Output|PC2-14|PWM output corresponding to current draw|-|4|Circuit Unknown|Output|PC3-4|Possibly a ground fault indicator|-|5|Circuit Open|Output|PC2-12|Indicates if a load is connected to the High Voltage output|-|6|Circuit Shorted|Output|PC2-10|Indicates if the High Voltage output is shorted|-|7|HV Enable|Input|PC1-8|Active Low - Set low to enable HV output control by DAC, set high to disable HV supply|-|8|DAC Clock|Input|PC1-6|Active Low - 12 clock cycles|-|9|DAC Data|Input|PC1-4|Active Low - Data MSB|-|10|DAC Strobe|Input|PC1-2|Active High - Strobe signal at the end of the data load|-|11, 12|GND|Input|PC3-3PC2-9,11,13,15|Ground supplied by logic board to Optocoupler receivers used to communicate back to logic board|}
===Active Components===