1. The addition of a crystal and two capacitors create the new DUMBO hardware class. In the original 1997-2006 P3/P4/P5 board the UART clock was derived from the CPU clock_out signal, in effect limiting the BRG, Baud Rate Generator in the UART which in turn limited the family to a maximum baud rate of 38,400 baud, see Libby CDi99 (it was the first P5). The additional crystal and two capacitors give the UART its own oscillator and this results in a P5-class board being capable of a maximum baud rate of 115,200 baud. Intensive testing proved that although the board is capable of operating at 115,200 baud it cannot sustain that speed in certain instances resulting in reliability issues. Subsequently the maximum baud rate for the DUMBO class was throttled back to the much more reliable rate of 57,600 baud.
2. The removal of the original RS232 transceiver and the addition of a small board with an RS485 transceiver create a new DUMBO-class board named LUCY. Both the DUMBO and LUCY boards, in addition to the traditional interval-based switching, also implement switching function #5, the sixth function since the first is function #0, which is a new very low and very high duty cycle-capable switching method. The sixth function does any duty cycle in exactly three (3) 3-second power cycles, if the total on-off period is 48 hours or less. Consider the power consumption implications of this: 1 minute on, 2879 minutes off, total period is 2880 minutes, controller executes the cycle in three 3-second "power ons", total controller "on" time is nine seconds in 48 hours! That's 2.5 or so minutes per month, secondary switching at its best!
3. The addition of yet another small board with an RS485 transceiver chip and a couple of silicon switch chips creates the CDi1s class of board, the Camaro, something that is 100% functionally and operationally compatible with the CDi3s and CDi3t machine classes, respectively the CorvetteI and CorvetteII.
   

• All three P5 derivatives DUMBO/LUCY/CDi1s can be assembled with lead-acid batteries for land applications. The lesser DUMBO/LUCY models are only meant to be used with a single analogue transmitter for optional line pressure measurement, so in addition to battery voltage and board temperature, these units also record line pressure if the transmitter is present, zero otherwise.
• LUCY/CDi1s have new RS485 communications with baud rate increased to 57,600 and optional NiMH batteries so submersible use possible if assembly method *6Z is used.
• When used with the latest software, DUMBO/LUCY units can perform sixth-function-switching in addition to traditional interval-based switching. WATER or GAS functionality built-in, also known as Fail-Open or Fail-Closed functionality.

1. DUMBO/LUCY/Camaro/CorvetteI/CorvetteII Hardware Authorization. It is implemented as a down counter (fuel gauge) of integral seconds decremented appropriately every time a reading is recorded, and replenished to the maximum value of approx. 15,811,200 (15.8 million seconds, 183 days x 86,400 seconds/day, 183 days is six months) every time the controllers are talked to by authorized software. If Software Authorization ever expires, the solenoid is opened, and both switching and recording are disabled if the controller is a switcher and only recording is disabled if the controller is not, in both cases interval is reset to the maximum of 1440 minutes. Hardware Authorization or Re-authorization can subsequently only be performed by qualified individuals.
2. DUMBO/LUCY/Camaro/CorvetteI/CorvetteII Debug Output. It is a way to know what a controller is doing without actually communicating with it. All five send a line of text out the serial port representing controller state just before shutdown occurs. The next few lines of text is example Debug Output from a CDi1s/Camaro switcher captured with free Tera Term software:
   
   2020-08-28 01:15:28, SW: 3 B:7.27 T:79.0 1: 0.0 5:-0.092 6:-0.057 SE:15810600
   2020-08-28 01:16:24, SW: 2 B:7.35 T:78.9 1: 0.0 5:-0.073 6:-0.042 SE:15810540
   2020-08-28 01:17:28, SW: 3 B:7.30 T:78.9 1: 0.0 5:-0.069 6:-0.040 SE:15810480
   2020-08-28 01:18:24, SW: 2 B:7.37 T:78.9 1: 0.0 5:-0.068 6:-0.038 SE:15810420
   2020-08-28 01:19:28, SW: 3 B:7.32 T:78.9 1: 0.0 5:-0.086 6:-0.052 SE:15810360
   2020-08-28 01:20:24, SW: 2 B:7.38 T:78.9 1: 0.0 5:-0.088 6:-0.061 SE:15810300
   2020-08-28 01:21:28, SW: 3 B:7.33 T:78.9 1: 0.0 5:-0.068 6:-0.061 SE:15810240
   
   We have Date, Time, SW=Switch State, B=Battery Volts, T=Temperature, 1=Casing Value, 5=U/S Value, 6=D/S Value, SE=Seconds Remaining. Switch State has 4 possible values, 0=Switching is Disabled and Switch is Off, 1=Switching is Disabled and Switch is On, 2=Switching is Enabled and Switch is Off, 3=Switching is Enabled and Switch is On.
3. DUMBO/LUCY/Camaro/CorvetteI/CorvetteII Low Battery Detection. They all record their own battery voltage so it wasn't all that difficult to implement this function across all of them. It takes 10 consecutive bad battery readings (battery voltage is below 5.8 Volts) for the controller to recognize a low battery condition. Once the low battery condition is detected the controller wll behave just like it does when Hardware Authorization has expired.
4. DUMBO/LUCY/Camaro/CorvetteI/CorvetteII Binary Program Matrix:
   
   64XX CDi1-CDi3 RMe Models, SCi Command Set, Not Implemented, CDiComm Software Bundle
   65XX CDi1-CDi3 RMe Models, Custom Command Set, Not Implemented, CDiDemo/CDiLComm/CDiMComm Software Bundle
   66XX CDi1-CDi3 Fte Models, SCi Command Set, CDiComm Software Bundle
   
   67XX CDi1-CDi3 FTe Models, Custom Command Set, M=MN=MNR, CDiMComm Software Bundle intended for divers
   00-29, CorvetteI Fte Binaries, CDi3s (2010 P7MAIN) Machine Class, DS1386 RTC, MNR Command Set
   3sMF6700 = CDi3s, DS1386, MN, FTe, 3TR Digital Switcher (6700)
   3sMF6701 = CDi3s, DS1386, MN, FTe, 1TR Digital Switcher (6701)
   3sMF6702 = CDi3s, DS1386, MN, FTe, 2TR Digital FlowMeter(6702)
   3sMF6703 = CDi3s, DS1386, MN, FTe, 3TR Digital FlowMeter(6703)
   3sMF6704 = CDi3s, DS1386, MN, FTe, 3TR Digital FlowMeter(6704)
   30-59, CorvetteII Fte Binaries, CDi3t (2016 CDi3.P7) Machine Class, DS1386 RTC, MNR Command Set
   3tMF6730 = CDi3t, DS1386, MN, FTe, 2TR Digital FlowMeter(6730)
   3tMF6731 = CDi3t, DS1386, MN, FTe, 3TR Digital FlowMeter(6731)
   3tMF6732 = CDi3t, DS1386, MN, FTe, 1TR Digital Switcher (6732)
   3tMF6733 = CDi3t, DS1386, MN, FTe, 2TR Digital Switcher (6733)
   3tMF6734 = CDi3t, DS1386, MN, FTe, 3TR Digital Switcher (6734)
   60-89, Ferrari FTe Binaries, CDi3f (2016 CDi3.LE) Machine, DS1553 RTC, MNR Command Set,
   3fMF6760 = CDi3f, DS1553, MN, FTe, 2TR Digital FlowMeter(6760)
   3fMF6761 = CDi3f, DS1553, MN, FTe, 3TR Digital FlowMeter(6761)
   3fMF6762 = CDi3f, DS1553, MN, FTe, 1TR Digital Switcher (6762)
   3fMF6763 = CDi3f, DS1553, MN, FTe, 2TR Digital Switcher (6763)
   3fMF6764 = CDi3f, DS1553, MN, FTe, 3TR Digital Switcher (6764)
   90-97, Camaro FTe Binaries, CDi1s (1997-2006 P3/P4/P5) Machine Class, DS1386 RTC, MNR Command Set
   1sMF6790 = CDi1s, DS1386, MN, FTe, 2TR Digital FlowMeter(6790)
   1sMF6791 = CDi1s, DS1386, MN, FTe, 3TR Digital FlowMeter(6791)
   1sMF6792 = CDi1s, DS1386, MN, FTe, 1TR Digital Switcher (6792)
   1sMF6793 = CDi1s, DS1386, MN, FTe, 2TR Digital Switcher (6793)
   1sMF6794 = CDi1s, DS1386, MN, FTe, 3TR Digital Switcher (6794)
   
   

Conclusions

• CDi1s is 100% functionally and operationally compatible with the latest CDi3s and CDi3t controllers. Only LUCY and CDi1s have optional NiMH batteries so they would be candidates for submersible use if *6Z assembly is used. Lead-acid batteries are still acceptable for DUMBO/LUCY/CDi1s land use, but unacceptable for submersibles.
• All lake devices to be compatible with CDiMComm, M=MNR, software. Since LUCY/CDi1s have been turned up a bit, and since CDi3s/CDi3t have been turned down a bit, there is only one baud rate for all: 57,600.
• All digital submersible transmitters communicate at 9,600 baud so they are interchangeable, for example, the casing transmitter from unit A will work as the casing transmitter in unit B without any other changes.
• Only one type of transmitter to buy for all possible jobs!