gca174-en
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— | gca174-en [2019/01/03 16:22] (current) – created - external edit 127.0.0.1 | ||
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+ | ====== GCA174 DCC/ | ||
+ | [[: | ||
+ | [[: | ||
+ | * [[: | ||
+ | \\ | ||
+ | |||
+ | ^^^^By Peter Giling ^^^^ | ||
+ | |||
+ | ===== Direct decoder for Motorola or DCC ===== | ||
+ | This board is based on the design of digital-bahn.de.\\ | ||
+ | The firmware , copyright of Digital-Bahn.de, | ||
+ | This board is only attachable to J5 of GCA145/ | ||
+ | It features the 7 outputs, needed to select position 1..48 on GC145/ | ||
+ | Also an isolated feed-back is provided.\\ | ||
+ | Feed-back is free to be used with systems like S88.\\ | ||
+ | The on-board opto-couplers isolate the didital rail signals and feed-back from the board.\\ | ||
+ | Feed-back is very nice inside Rocrail environment, | ||
+ | |||
+ | |||
+ | |||
+ | ===== The prototype ===== | ||
+ | |||
+ | | | ||
+ | \\ | ||
+ | |||
+ | ===== Hardware files of protoype ===== | ||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | \\ | ||
+ | ===== The final board design ===== | ||
+ | | board in production, coming in short term | | ||
+ | \\ | ||
+ | |||
+ | ===== Hardware files for final GCA174 design ===== | ||
+ | | {{: | ||
+ | | {{: | ||
+ | | {{: | ||
+ | \\ | ||
+ | |||
+ | ===== Address selection ===== | ||
+ | |||
+ | Basicly, the firmware from Digital-bahn.de comes with adress | ||
+ | By pressing the button, the decoder is in learning mode, showing D1 to flash.\\ | ||
+ | All you have to do now, is sending the first address from your central unit.\\ | ||
+ | After that, just pwer off GCA145 and power on again.\\ | ||
+ | The addresses of the next ports will be automaticly set in following sequence\\ | ||
+ | One other option is to download hex_minipu from this page: http:// | ||
+ | It will give you the option to directly change adresses and store them, before programming the chip.\\ | ||
+ | \\ | ||
+ | ===== Feed-back ===== | ||
+ | GCA174 has a feed-back signal, to inform Rocrail that turntable is ready to move trains on/off.\\ | ||
+ | This feed-back signal is electrical (galvanic)isolated from the GCA174.\\ | ||
+ | By connecting J2 pt 1(-) and 2(+) to any device like S88 units or derivates, | ||
+ | Rocrail will receive this port condition.\\ | ||
+ | Settings in Rocrail , see Position sensor | ||
+ | |||
+ | ===== Led signals ===== | ||
+ | GCA174 is priovided with 6 yellow leds for indication of decoded turntable position.\\ | ||
+ | The red led(D7) shows the write signal ( in Rocrail, look for 'new Position Flag' ), to inform GCA145 to start responding on the given position.\\ | ||
+ | \\ | ||
+ | |||
+ | |||
+ | |||
+ | ===== Connections of GCA174 ===== | ||
+ | {{: | ||
+ | |||
+ | ===== Extra modification on GCA145(MGV145) ===== | ||
+ | GCA174 needs 5 Volt which is by default not available from J5 on GCA145.\\ | ||
+ | Therefore, this diode 1N4003 (or equivalent) should be mounted under J5 as this picture shows.\\ | ||
+ | **NOTE:** The latest green pcb has this diode(D10) on board, so no further attention needed.\\ | ||
+ | {{: | ||
+ | \\ |
gca174-en.txt · Last modified: 2019/01/03 16:22 by 127.0.0.1