Hello,
I’ve got a problem with my HAC-LN96 wireless modems. I am sending simple 1-byte packet (containing only its number) every 20 ms, and it seems that most of the bytes are lost - they never appear on the other side.
For example after sending 220 packets to first modem I received following frames with the second modem:
4 8 10 22 27 30 46 47 49 50 63 68 78 84 95 100 110 113 114 116 120 131 136 140 154 155 156 157 159 172 183 188 190 193 204 205 208 215 216
That is about 40 frames out of 220 which is less than 20% efficency.
When I send packets longer than 1 byte, they are also often lost during transmission. Oddly, it is always full packet missing, never just part of it. When I send 1 byte packets less often (1 packet/second), still most packets are lost.
I am using Atmel AT91SAM7S microcontroller - modem is connected through TTL lines to UART0. Parity is set to 8N1 (E jumper set). Other jumpers are not set. VCC is around 4.9V. I tested it at 20 meter distance. I also tested modems with Hyperterminal and PC (with D jumper set) - same problem.
Have you experienced similar problems?
Maciej