Editing RS232 RS485 USB Converter Board

==Features==
<!--<graphviz>
digraph blks_conn {
    mcu [shape=box, label="mcu"];
    RS232 [shape=box, label="rs232"];
    rs485_422 [shape=box, label="rs485/422"];
    usb [shape=box, label="slave usb"];
    comm [shape=box, label="common wires"];
    mcu -> comm [dir = both];
    comm -> RS232 [dir = both];
    comm -> rs485_422 [dir = both];
    comm -> usb [dir = both];
}
</graphviz>-->
*for low traffic and low speed application
*mcu, RS232, RS485/RS422, slave usb all can be interchangeable.
*usb side
**support platform in linux with usb driver
**simulated uart programming in application level
*rs232 to rs485 side
**Tested max. baudrate is 115200(i assume more high baudrate can be accepted, but i have not tested)


==Technical==


===RS232===
*[http://www.realhamradio.com/tac32-interface.htm RS232 Circuit examples]

===USB===
*Host Computer Setting for usb connection
**[http://www.ftdichip.com/ Using Solution from FTDI Chips]
**[http://www.ftdichip.com/Drivers/FT2232CDrivers.htm#VCP Linux USB Driver and its usb api, a simulate uart api match to usb api FOR ftdichip]
**References
***[http://www.beyondlogic.org/usb/ftdi.htm beyondlogic for ftdi]
***[http://ftdi-usb-sio.sourceforge.net/ sourceforge usb driver for ftdi]
*chips
**[http://chungyan5.no-ip.org/WebServerDocs/open_data/KnowledgeDb/ComputerSysDevelopment/apps/comm/converter/ds2232c_15.pdf ds2232c]


===RS485===
*chips
**Linear Technology Corp., LTC2859 and LTC2861
**[http://chungyan5.no-ip.org/WebServerDocs/open_data/KnowledgeDb/ComputerSysDevelopment/apps/comm/converter/DS3695.pdf DS3695]


===Circuit and PCB===
*[http://chungyan5.no-ip.org/vc/?root=converter gEDA Project Files]
:OR [[Media:Converter.zip|Download here, not always updated]]
:gEDA libraries can be download [http://www.opencircuits.com/PCB_Footprints here] or [http://chungyan5.no-ip.org/open_data/electronic_computer/eda/geda/libs more updated], then modify the gafrc inside converter/
*We have components and PCB, Or some have already soldered, if needed email to us: [mailto:yan@amonics.com yan]

==ToDo==
*get a usb chips to uart, which with linux driver
**MCT P87C52UBAA(http://pfranc.com/usb/usb.mhtml)
**cypress, PSoC with USB
*linux driver
**driver in linux : http://ftdi-usb-sio.sourceforge.net/
**usb in linux guide : http://www.linux-usb.org/USB-guide/book1.html
*get a usb to rs232/485 converter driver
**driver in windows : http://www.hexin-tech.com.cn/
*re-design all PCB boards dimension following a mechanical box
*merge RS232 board and RS232_dspic_prog board together
**using 5 pins as TTL level connection, adding one more for RS485 ctrl, and pin layouts as "signal power signal power ..."
*In the market, it has so many these kind of converter and very cheap price(<HK100) and they are including a small mechanical box(electronic does not complex, but mechanial box is complex), which is better than what we do by ourself.
[[Category:Projects]]