Other devices have RS232 ports, usually either DB9 (PCs, enterprise-class network hardware) or RJ45 (Cisco). In order to be ready to connect a laptop to any encountered device, one's commando kit must ...

Did it have a little adapter in the box? There was a time when if you bought a USB mouse, in the box was ... it may well have come with an adapter for a 9-pin RS232 serial port.

Older Hewlett-Packard pen plotters usually had an RS232 interface, but they were also available with GPIB (a.k.a ... This is complicated by the fact that the driver for the Arduino's USB-serial ...