From: | bill.longman@×××××.com | ||
---|---|---|---|
To: | gentoo-user@l.g.o | ||
Subject: | Re: [gentoo-user] [OT] laptop desktop serial connection don't work on one direction | ||
Date: | Sat, 05 Nov 2011 19:58:48 | ||
Message-Id: | 4eb5951b.8806440a.6a0c.43ce@mx.google.com | ||
In Reply to: | Re: [gentoo-user] [OT] laptop desktop serial connection don't work on one direction by Mick |
1 | Pardon my top post please. You'll have too ensure that you have only three wires. Line 2 to 3, line 3 to 2 and line 5 straight through. I don't think you'll be able to get bi directional serial links if you have the other hardware lines connected. -- Sent from my HP TouchPad On Nov 5, 2011 3:17 AM, Mick <michaelkintzios@×××××.com> wrote: On Saturday 05 Nov 2011 09:20:19 Kfir Lavi wrote: |
2 | > Hi all, |
3 | > I have a problem connecting my laptop to my server at home with a serial |
4 | > cable. |
5 | > I have cable end for /dev/ttyS0 and 2 cable ends for /dev/ttyUSB0. |
6 | > This lets me test the connection between all serial outputs. |
7 | > Desktop1-minicom <-> Desktop2-minicom |
8 | > works with all connections, i.e ttyUSB0 <-> ttyUSB0, or ttyS0 <-> ttyUSB0 |
9 | > and viseversa. |
10 | > So when connecting 2 desktop computers everything works as expected. |
11 | > |
12 | > The problem: |
13 | > When I connect my laptop to any of those desktops, I get just one way |
14 | > connection! |
15 | > If I swap the sides of the cable, the one way connection switch side. |
16 | > The laptop doesn't have ttyS0, so it have to be connected via ttyUSB0 |
17 | > When I swap sides, it is just between two usb dongles. |
18 | > |
19 | > The usb dongles are PL2303 both sides. |
20 | > Settings of minicom is 38400 8n1 Hardware Flow Control=OFF |
21 | > |
22 | > Laptop setserial: |
23 | > setserial -a /dev/ttyUSB0 |
24 | > /dev/ttyUSB0, Line 0, UART: 16654, Port: 0x0000, IRQ: 0 |
25 | > Baud_base: 460800, close_delay: 0, divisor: 0 |
26 | > closing_wait: infinte |
27 | > Flags: spd_normal |
28 | > |
29 | > Desktop1 setserial: |
30 | > setserial -a /dev/ttyS0 |
31 | > /dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4 |
32 | > Baud_base: 115200, close_delay: 50, divisor: 0 |
33 | > closing_wait: 3000 |
34 | > Flags: spd_normal skip_test |
35 | > |
36 | > setserial -a /dev/ttyUSB0 |
37 | > /dev/ttyUSB0, Line 0, UART: 16654, Port: 0x0000, IRQ: 0 |
38 | > Baud_base: 460800, close_delay: 0, divisor: 0 |
39 | > closing_wait: infinte |
40 | > Flags: spd_normal |
41 | > |
42 | > I tried to add the skip_test but this seems to be not working. |
43 | > I'm not sure what to do next. |
44 | > |
45 | > Any help will be appreciated, |
46 | > Thanks, |
47 | > Kfir |
48 | |
49 | I think that you will need the pin mapping of a 'null modem' to be able to |
50 | have bidirectional connectivity. |
51 | |
52 | Have a look here: |
53 | |
54 | http://en.wikipedia.org/wiki/Null_modem |
55 | |
56 | I think I still have an RS-232 to D9 null modem adaptor somewhere in my bins |
57 | of spares. |
58 | |
59 | HTH. |
60 | -- |
61 | Regards, |
62 | Mick |
63 |
Subject | Author |
---|---|
Re: [gentoo-user] [OT] laptop desktop serial connection don't work on one direction | Kfir Lavi <lavi.kfir@×××××.com> |
Re: [gentoo-user] [OT] laptop desktop serial connection don't work on one direction | Maciej Grela <maciej.grela@×××××.com> |