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On Sat, Nov 5, 2011 at 12:48 PM, Kfir Lavi <lavi.kfir@×××××.com> wrote: |
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> On Sat, Nov 5, 2011 at 12:17 PM, Mick <michaelkintzios@×××××.com> wrote: |
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> |
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>> On Saturday 05 Nov 2011 09:20:19 Kfir Lavi wrote: |
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>> > Hi all, |
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>> > I have a problem connecting my laptop to my server at home with a serial |
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>> > cable. |
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>> > I have cable end for /dev/ttyS0 and 2 cable ends for /dev/ttyUSB0. |
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>> > This lets me test the connection between all serial outputs. |
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>> > Desktop1-minicom <-> Desktop2-minicom |
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>> > works with all connections, i.e ttyUSB0 <-> ttyUSB0, or ttyS0 <-> |
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>> ttyUSB0 |
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>> > and viseversa. |
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>> > So when connecting 2 desktop computers everything works as expected. |
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>> > |
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>> > The problem: |
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>> > When I connect my laptop to any of those desktops, I get just one way |
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>> > connection! |
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>> > If I swap the sides of the cable, the one way connection switch side. |
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>> > The laptop doesn't have ttyS0, so it have to be connected via ttyUSB0 |
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>> > When I swap sides, it is just between two usb dongles. |
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>> > |
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>> > The usb dongles are PL2303 both sides. |
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>> > Settings of minicom is 38400 8n1 Hardware Flow Control=OFF |
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>> > |
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>> > Laptop setserial: |
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>> > setserial -a /dev/ttyUSB0 |
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>> > /dev/ttyUSB0, Line 0, UART: 16654, Port: 0x0000, IRQ: 0 |
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>> > Baud_base: 460800, close_delay: 0, divisor: 0 |
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>> > closing_wait: infinte |
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>> > Flags: spd_normal |
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>> > |
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>> > Desktop1 setserial: |
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>> > setserial -a /dev/ttyS0 |
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>> > /dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4 |
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>> > Baud_base: 115200, close_delay: 50, divisor: 0 |
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>> > closing_wait: 3000 |
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>> > Flags: spd_normal skip_test |
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>> > |
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>> > setserial -a /dev/ttyUSB0 |
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>> > /dev/ttyUSB0, Line 0, UART: 16654, Port: 0x0000, IRQ: 0 |
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>> > Baud_base: 460800, close_delay: 0, divisor: 0 |
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>> > closing_wait: infinte |
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>> > Flags: spd_normal |
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>> > |
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>> > I tried to add the skip_test but this seems to be not working. |
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>> > I'm not sure what to do next. |
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>> > |
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>> > Any help will be appreciated, |
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>> > Thanks, |
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>> > Kfir |
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>> |
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>> I think that you will need the pin mapping of a 'null modem' to be able to |
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>> have bidirectional connectivity. |
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>> |
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>> Have a look here: |
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>> |
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>> http://en.wikipedia.org/wiki/Null_modem |
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>> |
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>> I think I still have an RS-232 to D9 null modem adaptor somewhere in my |
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>> bins |
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>> of spares. |
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>> |
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>> HTH. |
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>> -- |
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>> Regards, |
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>> Mick |
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>> |
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> Hi and thanks for replaying. |
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> This cable setup is working between the 2 desktop computers |
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> bidirectionally. So, it seems that that part I got right. |
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> The problem is when the laptop use the same cable connection and have just |
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> one direction. |
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> |
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> Basically, I need to cross pin 2 and 3, and I have the setup open, so I |
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> can cross whatever pin I want. |
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> |
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> Regards, |
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> Kfir |
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> |
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I have checked this with another laptop, and everything works as expected. |
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(serial connection ttyUSB0 from laptop to ttyUSB0 or ttyS0 on the desktop1). |
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setserial and stty shows the same output on both laptops, so my guess, it |
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is something related to the USB system?! |
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Can someone have a guess on this? |
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Regards, |
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Kfir |
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