I've got an Access Point that has a serial port. The AP runs Linux
(it's an Netgear WG302). I can't connect to it from Linux using
minicom.
After messing with it for an hour I brought out an old Win95 machine
with hyperterm and was able to connect no problem. So, AP and cable
are working fine.
I suspect it's minicom that's causing me problems. Likely flow
control. Minicom always reports "OFFLINE".
Anyway, I have two serial ports. I think they both are operational --
hardware wise.
I do have a device on ttyS0 that works fine. (It's an
X10 remote control). So I know that serial port works.
I've tried:
- using both serial ports to talk with the AP, since I know ttyS0
works with my other device.
- used a null-modem connector to try and talk with the Windows
hyperterm. No luck. I made sure all settings matched on both
machines. I even tried echo "hello" > /dev/ttyS1
- I use setserial to set the baud rate to what the AP wants 9600 N 8 1
bumby:/home/moseley# setserial -ag /dev/ttyS*
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4
Baud_base: 115200, close_delay: 5000, divisor: 0
closing_wait: 37856
Flags: spd_normal skip_test
/dev/ttyS1, Line 1, UART: 16550A, Port: 0x02f8, IRQ: 3
Baud_base: 9600, close_delay: 50000, divisor: 0
closing_wait: 50880
Flags: spd_normal skip_test
- I've looked at /proc/tty/driver/serial and can see "CTS" change when
I remove the cable from the AP:
bumby:/home/moseley# cat /proc/tty/driver/serial | grep ^1
1: uart:16550A port:000002F8 irq:3 tx:0 rx:0 CTS
<remove cable from Access Point>
bumby:/home/moseley# cat /proc/tty/driver/serial | grep ^1
1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
- I'm not using flow control:
bumby:/etc/minicom# cat minirc.dfl
# Machine-generated file - use "minicom -s" to change parameters.
pu port /dev/ttyS1
pu baudrate 9600
pu mdropdtr 0
pu updir /tmp
pu downdir /tmp
pu scriptdir /tmp
pu hasdcd No
- Just for "fun" I tried changing hasdcd to Yes and mdropdtr to 1 with
out any change.
- I know minicom is sending chars. Notice the tx:0 count above in the
output of /proc/tty/driver/serial
bumby:/etc/minicom# cat /proc/tty/driver/serial | grep ^1
1: uart:16550A port:000002F8 irq:3 tx:0 rx:0 CTS
<start minicom -- it sends modem init string (how to disable?)
bumby:/etc/minicom# cat /proc/tty/driver/serial | grep ^1
1: uart:16550A port:000002F8 irq:3 tx:34 rx:5 brk:5 RTS|CTS|DTR
<minicom still says "OFFLINE">
Hitting keys in the minicom window will bump up the tx: count.
- Moving the cable from my linux box to Windows Hyperterm works right
away -- I see the prompt from the AP
What am I doing wrong?
--
Bill Moseley
[EMAIL PROTECTED]
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