Features include ...

Isolation 100% tested at >1000V AC
Plugs directly into IBM PC serial port
Very low cost
No separate power supply required in most applications
Baud rate independent 0-38 kbaud
Latest surface-mount technology
Very low power CMOS
MIL-STD conformally coated circuitry

Do not confuse these isolated models with imitations which claim to be self-powered but which in fact require power to be supplied to both sides of the converter, or which require about 40mA - far too much for any PC interface to supply.

RS232 to RS232 Isolation

K232-ISOL

The K232-ISOL is an RS232-RS232 isolator for up to 38400 baud. It is intended for full-duplex point to point communication. TX,RX signals only (no hardware handshakes) are supported.