Hi All
You will need a USB/RS232 converter lead, plenty of these on eBay, but do not obtain an RS232-TTL lead these will not work.
RS232 provides +/-12v, RS232 provides 0v/+5v, but the real issue is that RS232-TTL uses inverted logic, so it is not only the voltage level, but also a logic1 translates to a logic0.
Thx
Lee