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+====== GCA125 Interface for turtoise type turnout drives ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#interfaces|GCA]]
+  *  [[mgv-overview-en|The GCA modules]]
+ \\
+^^^^By Peter Giling ^^^^
+==== Features and facts ====
+{{  :gca:gca125_pict02.jpg?300}}
+  *  8 individual inputs, commanding 8 individual outputs
+  *  600 mA max load per output.\\
+  *  Max 42 Volt per output.
+  *  8 individual inputs.
+  *  Time selection for output duration.
+  *  Outputs are activated one by one for power reduction.
+===== Description =====
+Controlling a LGB 1201, Kato or Fulgurex turnout-drive, in fact also some type of Hoffmann turnout motors, only have one coil or motor, that needs to be controlled by polarity.\\
+Even the Bohler WA2 is very nicely useable with this interface.\\
+The normal driver like GCA77 is not suitable for that.\\
+The complexity of this unit is slightly higher.\\
+For GCA drive-units it is standard, to have an isolation between power for the coils or motors and the LocoNet system by means of optocouplers.\\
+That is also done on this board.\\
+The processor runs on 5V from GCA50 / CAN-GC2 or GCA_PI02, and the processor drives two optocouplers to send I2C commands to expanders.\\
+This unit is able to control 8 turnouts, and need 8 inputs from the GCA50 / CAN-GC2 / GCA_PI02.\\
+It is also possible to use a switch for direct activation without GCA50 / CAN-GC2 / GCA_PI02. \\
+You will need a 5 Vdc to activate the processor.\\
+One other option is to use GCA174 DCC or Motorola function decoder, to drive directly from the central unit.\\
+The software in the PIC16F628 is made in such a way that the processor provides a correct timing for the coil, and switch it off after the chosen time.\\
+This will take care that the turnout coil or motor will not be overheated by too long powering.\\
+The time selection is done with the Dipswitch, and counts for all outputs.\\
+The processor in the circuit needs 11 inputs and 18 outputs, and 3 extra for dip-switch reading. \\
+Instead of these 29 I/O ports, smaller PIC processors have only maximum 16 I/O.\\
+Therefore I used I2C expanders, adding 16 extra outputs and making a small processor suitable.\\\\
+===== Old version  =====
+[[GCA125-proto-en|This is the original page for this board, created for a home-made prototype.]]
+===== The hardware files =====
+|  {{:gca:gca125_sch.pdf|The schematics}}  |
+|  {{:gca:gca125_pcb.pdf|The pcb Layout}}  |
+^  N.B. Self made pc-boards are not supported!  ^
+===== Cable to GCA50 / CAN-GC2 / GCA_PI02=====
+refer to:
+**[[PSK-Interface connections-en|Connection interfaces]]**
+===== Firmware =====
+{{mgv:hardware:mgv125.zip|program files}}
+===== Time delay settings =====
+SW1 is used to set the delay time after which the output will be switched off.
+^ Delay table  ^  ^  ^   ^
+|  Motor activation  \\  in Sec  |  SW1.1  | SW1.2  |  SW1.3  |
+|  0.1   |  Off   |   Off   |   Off   |
+|  0.2   |  Off   |   Off   |   On   |
+|  0.4   |  Off   |   On   |   Off   |
+|  0.8   |  Off   |   On   |   On   |
+|  1.6   |  On   |   Off   |   Off   |
+|  3.2   |  On   |   Off   |   On   |
+|  6.4   |  On   |   On   |   Off   |
+|  12.8   |  On   |   On   |   On   |
+===== Remarks =====
+Inputs, if activated, should remain activated, to keep motor/coil in the chosen position.
+GCA50/CAN-GC2/GCA_PI02 ports should be programmed as switch, with C2 NOT checked.
+Checking C2 will inverse action.