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gca500-en [2018/11/12 08:56]
gca500-en [2018/11/12 08:56] (current)
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 +====== GCA500 LNet 16 bits I/O interface with SUBD-9 and RJ12 sockets ======
 +[[english|{{ ​ rocrail-logo-35.png}}]]
 +[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#​locoio|GCA]]
 +  *  [[mgv-overview-en|The GCA Modules]]
 +    * [[:​lnsv-en|Setup dialog]] | [[:​loconet:​lio-sw:​lio-sw|Setup protocol]]
 +{{  :​gca:​gca500_pict01.png?​230}}{{ ​ :​gca:​gca500_pict02.png?​250}}
 + \\
 +^^^^By Peter Giling ^^^^
 +===== Unit is made on the same basics as GCA50 =====
 +GCA50 was originally made for Modelspoor Groep Venlo (MGV) to be used for the modules of the large layout with K-rails from Märklin.\\
 +Because these modules were frequently be separated, transported and joined together on various shows, the choice was made to use\\
 +Sub-dconnectors instead of the mechanical rather weak RJ12 connectors.\\
 +Also because of the large amount of GCA50 units ( up to 90 !) the current in a RJ12 connector and cable was rather limited.\\ ​
 +But more and more people prefer the use of RJ12 cable, so together with the creation of GCA51 for RFID, the GCA50 was created with RJ12 connectors, and called GCA500.\\
 +The pictures on top show the two options: ​
 +  *  only two RJ12 connectors.
 +  *  SUB-d male and female and one RJ12,
 +===== Hardware =====
 +|  {{:​gca500_sch.pdf|The schematic design}} ​ |
 +|  {{:​gca500_pcb.pdf|The printed circuit board with part positions}} ​ |
 +|  {{:​gca500_parts.pdf|The bill of materials}} ​ |
 +===== Connections and port information =====
 +Please refer to GCA50.
 +===== Jumper setting =====
 +JP1 is used for reporting startup situation.\\
 +When GCA500 is powered up, it will report the logical situation of all ports which are configured as input.\\
 +When JP1 is set, this report will be aborted, which can be useful for some slow starting systems.\\
 +GCA85 or GCA101, together with Rocrail, will not have that restriction,​ so you can leave the jumper off.\\
 +===== Other differences between GCA50 and GCA500 =====
 +ON GCA500 a serial resistor R14 in the lococNet communication line is added, to avoid damage in T1 , when wrong connections are made (cable faults).\\
 +R14 lowers the total current through T1 in order to keep it in good health.\\
 +The power regulator VR2(7805 TO-220) can also be replaced by VR1 (= R-78E5).\\
 +This switching regulator can handle up to 1 Amp constant current, with very low loss of energy in heating.\\
 +For larger setups with many units, this is preferable because it takes about 60% less load from the 12 Volt power supply.\\
 +Also, when one or two GCA107 boards are connected, and many relays continiously activated, the VR1 is needed.\\
 +===== Fits in Littfinsky LDT-1 box =====
 +Same as GCA51, the GCA500 is also useable to be fixed in a Littfinsky LDT-1 box.\\
 +These boxes are available from 
 +  *  Littfinsky http://​​AUSLAUFMODELLE/​Digital/​Littfinski-000104-Gehaeuse-LDT-01.htm?​shop=modellbahn&​SessionId=&​a=article&​ProdNr=LDT000104&​t=4718&​c=9027&​p=9027
gca500-en.txt · Last modified: 2018/11/12 08:56 (external edit)