Add plc series types to support FP7 and EcoLogiX

- add new checksum calculation for Mewtocol 7

DocBuilder/Docs/reverse_engineering_data.md

@@ -3,7 +3,7 @@
 - What is the HW information byte for?
 - What are the last bytes of the EXRT message for?
 
-# Actual Readouts
+# Mewtocol Init
 
 | PLC TYPE     | CPU Code | Machine Code | HW Information|
 |--------------|--------------|--------------|---------------|
@@ -94,4 +94,44 @@ FP-XH 16k C14R
 | 81 | Op mode |
 | 00 | Link unit |
 | 60 | Error flag |
-| 0000 | Self diag error |
+| 0000 | Self diag error |
+
+# Mewtocol-7 Com
+
+## Getting the status of the plc
+
+`%EE#RT`
+
+Normal plc would return the default, see above.
+
+The FP7 series returns:
+
+`%EE$RT0000000100000000`
+
+> This indicates that the device uses the Mewtocol 7 format
+
+When trying to use EXRT the FP7 returns not supported
+
+[R] `%EE#EX00RT00`
+
+[S] `%EE!42`
+
+Then request the status from the PLC using Mewtocol 7
+
+[R] `>@EEE00#30STRD00`
+
+[O] `>@EEE00$30STRD`
+
+|Reponse Byte|Description|
+|-------------|-----------|
+| 00 | Read status (always 0) |
+| 07 | series code: 7 = FP7 |
+| 10 | model code: 3 = CPS41E, 4 = CPS31E, 5 = CPS31, 6 = CPS41ES, 7 = CPS31ES, 8 = CPS31S, 9 = CPS21, 10 = ElC500 |
+| 0000 | user special order code (Not important) |
+| 0453 | latest cpu version = 4.53 |
+| 0453 | communication cpu version = 4.53 |
+| 0453 | operation cpu version = 4.53 |
+| 01 | op mode = 4.53 |
+| 00 |  error flag |
+| 0000 | self diag error |
+| 00 | sd card information |