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