[Paparazzi-devel] Aerocomm modems

[Steve Joyce]

Hi,

I'd like to hear from someone who has experience with Aerocomm modules
for the paparazzi datalink.  Specifically which firmware settings to use
on the modules (RF delivery mode, interface baud rate, any handshaking
etc.).

Right now, I have my datalink working with AC4868-250 modules, but not
very reliably.  I get lots of receive errors, messages are often missed,
and the uplink always requires several tries for commands to get
through.  I don't think it is an antenna/range problem because the
behaviour is the same in the lab and the Aerocomm OEM range test utility
shows no errors over the link.  It almost seems like a buffering or RF
data collision problem, but I'm not sure what to try next.  

My setup now is with an interface baud rate of 57600 (gives an RF baud
rate of 28800), broadcast mode (no addressing), Half duplex.  I did try
full duplex, but it cuts the total throughput in half and the behaviour
was even worse.

Thanks in advance for any tips.

/Steve