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...Sending ascii command: "TST{CR}" Response: "TST=0;0;0;0;0;0;0{CR}" On the internet it seems that more people are looking for information. This version is from before the time that Siemens sold the design to Choride. The funny thing is that the CPU control board for old and new versions is the same. Only the firmware is different. The hardware design is similar for all devices. Switch mode step down power supply to charge the batteries Switch mode symmetrical step up to + and - 375 volt using FET brid...