Many thanks for the ideas, all. I've done some tests which point towards the
RS485/USB converter rather than anything in the code:

1. The MAX3080E is wired as full duplex, and DE is controlled by software
and set high prior to transmitting.

2. I changed the code to something like this:
[code]
for(i=0;i<200;i++) {
     putintdec(i);
     putch('-');
}
[/code]
and received the full string of all 200 numbers. Same when running the 'for'
loop from 0 to 100. However when running from 0 to 50, 0 to 25 and 0 to 15,
the first six to twelve numbers weren't received.

3. I looked into the USB device and found it had a DIP switch which let me
choose "RS-422 mode: 4-wire with handshaking" which seemed to clear the
problem up.

So it looks as though it was a handshaking problem in the end.

Many thanks again.

Jamie
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