Dear linux-hams,
First of all, thanks for reading this message.
Right now I'm using the amateur AX.25 software for Linux for about \half a
year , with good results.
I'm using a PA0HZP 'clone' which has up to 4 channels, although I only use
2 of them. To be precise, only the ports scc0 and scc2 are used, because
the port scc1 is broken due to an electrical storm (If you found that my
setup is strange :)
But, I'm trying to set up a correct DCD coupling with the SCC driver
from Joerg Reuter. This allways fails, my 2 transmitters are allways
sending independently, e.g. at the same time, no matter how I set up the
z8530drv.conf.
I furtunately do not have those strange 'lockups' of the driver (I mean:
still receiving but no transmitting) since I use the z8530 driver compiled
directly into the kernel. (At least, that solved it for me)
The hardware I use:
* Pentium 133MHz
* PA0HZP Opto Coupled ESCC card with 2 x Zilog's Z85230 controller
(The chips say: Z85230 10PSC ESCC 9649-GG)
Current software setup:
* Linux 2.0.35 (SuSE 5.3 with libc5)
* z8530drv v2.4c
* (ax25-utils-2.1.42a (Should have nothing to do with it))
Some global configuration parameters from z8530drv.conf :
...
escc yes
vector 0x168
special no
option 0
...
The port-specific parameters:
e.g. /dev/scc0
...
speed 1200
clock dpll
mode nrzi
group 129 (201 Octal = 129 Decimal (says my calculator.... :-) )
softdcd on
Of course, /dev/scc2 does have the same group as /dev/scc0.
Indeed, I use the software DCD since I have 2 very simple modems attached
to it (But reception and everything works good)
Could it be the fact that I'm using the 2 controllers, instead of
using scc0 and scc1 ? Since scc0 is from the first Z85230 and scc2 is from
the second Z85230...? (just guessing)
Or do I have to use a different (global) parameter setting in my
z85230.conf ? I don't use any options, nor the 'special' parameter, but I
_do_ use the escc parameter, allthough 'Z85230' is not listed as 'escc'
in de the documentation.
I've played with the parameters, read the scc_eng.doc more than one time,
but still it isn't working. Right now I remember that I had the same
problem with the 'escc' driver in the JNOS package which I used 'ages ago'.
On the other hand, with the escc driver in the package PE1CHL the DCD
coupling worked fine.
Now I sometimes loose transmitted frames, because another port was
already transmitting and this has a lot of effect on the performance of a
gatewayed connection. :-( But then I'm also glad my antenna switch has a
hardware inbuild automatic PTT interrupt.. (totally home-brewed)
I hope someone has the solution to this particular problem, allthough I am
not a licenced HAM. I do my radio network experiments on the Citizens Band,
which is legal here when using only 1200 bd (slow, but costless).
And since Linux is the only flexible way to play with AX.25 & TCP/IP......
Thank's for reading, and thank's in advance for help.
With kind regards,
Michel.
Michel - NL0BXR - a.k.a. The ÆpocalypsE - Boxmeer
Email : [EMAIL PROTECTED]
If I'm online, you could try:
BBS : telnet://scoop.demon.nl:6300
Node : telnet://scoop.demon.nl:3694
