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gca174-en
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gca174-en [2019/01/03 16:22] (current) phg created |
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| + | ====== GCA174 DCC/Motorola decoder for GCA145 ====== | ||
| + | [[:english|{{ rocrail-logo-35.png}}]] | ||
| + | [[:english|Content]] -> [[:hardware-en|Hardware]] -> [[:hardware-en#interfaces|GCA]] | ||
| + | * [[:mgv-overview-en|The GCA modules]] | ||
| + | \\ | ||
| + | |||
| + | ^^^^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, is available at http://www.digital-bahn.de/bau_led/led_schalten.htm#download\\ | ||
| + | This board is only attachable to J5 of GCA145/MGV145.\\ | ||
| + | It features the 7 outputs, needed to select position 1..48 on GC145/MGV145.\\ | ||
| + | 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, because it can signal Rocrail to start a train AFTER the selected postion has been reached.\\ | ||
| + | |||
| + | |||
| + | |||
| + | ===== The prototype ===== | ||
| + | |||
| + | | {{:gca:gca174_pict_02.jpg?600 }} | The board with opto-couplers \\ ready to be connected to GC145 | | ||
| + | \\ | ||
| + | |||
| + | ===== Hardware files of protoype ===== | ||
| + | {{:gca:gca174_sch.pdf|The schematics}}\\ | ||
| + | {{:gca:gca174_pcb.pdf|The pc-Board and parts positions}}\\ | ||
| + | {{:gca:gca174_parts.pdf|The bill of materials}}\\ | ||
| + | \\ | ||
| + | ===== The final board design ===== | ||
| + | | board in production, coming in short term | | ||
| + | \\ | ||
| + | |||
| + | ===== Hardware files for final GCA174 design ===== | ||
| + | | {{:gca:gca174final_sch.pdf|The schematic drawing}} | | ||
| + | | {{:gca:gca174final_pcb.pdf|The pcb and parts positions}} | | ||
| + | | {{:gca:gca174final_parts.pdf|The bill of materials}} | | ||
| + | \\ | ||
| + | |||
| + | ===== Address selection ===== | ||
| + | |||
| + | Basicly, the firmware from Digital-bahn.de comes with adress 1..7.\\ | ||
| + | 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://www.digital-bahn.de/bau_pic/hexmanipu.htm#download .\\ | ||
| + | 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 ===== | ||
| + | {{:gca:gca174_connections.pdf|}} | ||
| + | |||
| + | ===== 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.\\ | ||
| + | {{:mgv:hardware:extra-diode_on_gca145.jpg|}} | ||
| + | \\ | ||
gca174-en.txt ยท Last modified: 2019/01/03 16:22 by phg
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