When plugged in, the Pi will see the cable as a serial port, although I'm not entirely sure what name the device would have, except it won't be /dev/ttyAMA0 The voltage levels at that end are RS-232 "standard" and should not be connected directly to anything on the Pi.īoth kinds are freely available from on-line stores such as Amazon, here are UK links for the "true" serial kind.
The second is a "true" USB/Serial converter and has USB at one end and a DB9 or DB25 (although not often these days!) connector at the other.
The first one is commonly used by people talking to microcontrollers and similar devices, it has a USB at one end, and a wiring connector (usually 4 or 6 pins or sockets) at the other, and is designed to use TTL level voltages. You would typically use a USB/Serial converter.
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